I was walking the shop floor the other day and stopped to chat with Kayla and ask her what she was winding. It was four ends of Type T, Thermally Heat Cleaned yellow 450 ½ fiberglass yarns onto a 4 ¼” tube. At another station, Jamie was winding 2 ends of 150 ½ white on a 5 ¼” tube, also Thermally Heat Cleaned, and the other operators were all winding something different still. The thought occurred to me that we offer LOTS of different possible combinations of PTFE Coated Fiberglass Yarn. I wondered how many there are.

How many combinations of PTFE Coated Fiberglass Yarn could we possibly make? The formula is more complicated than I remembered from High School math class… so off to Google to find a combination calculator! Given that we have 7 sizes of fiberglass yarn products that we regularly coat (ex: 450 ½, 150 ½, etc…), in a natural Type R yarn and in 9 Type T Mil-Standard colors, then add the number of parallel ends we wind, the package we can wind them onto, etc. and you come up with over 6 million possible combinations! Wow. The reality is that some of those possible combinations will never happen. But a quick look at last year’s production reveals we wound over 200 different combinations, some in quantities as small as one pound. OK, nowhere near 6 million, but still impressive, I think.

 And remember that we do not require minimum order quantities for most products we manufacture. If we’re coating an “odd duck” product, we do an entire coating run.  This means we’ll be carrying inventory on that product for some time, but if someone needs 3 ends of purple 225 ½, we’ll be able to respond quickly and, almost always, with no minimum order quantity. Sure, we carry inventory that some “consultants” would consider ridiculous, but when our customers need it, we’re ready to supply them quickly.

The possibility of many different combinations of PTFE Coated Fiberglass Sewing Thread also exists, but our standard products pretty much cover the gamut. Of course, we’re always developing new products in response to customer needs.  How about a UV Resistant, PTFE Coated Kevlar Sewing Thread, black in color… we’ve already done it (R722-80BLK)!  And we can do many other combinations. But even without calculating all the possible combinations, we currently offer over 50 different types of PTFE Coated Sewing Thread as standard products. It’s worth noting that our ability to twist products in-house allows us to offer such a wide variety of products quickly and cost effectively.  It also enables us to react quickly to new opportunities.

PTFE Coated Fiberglass Lacing Tapes and Tie Cord along with PTFE Coated Fiberglass Draw Cord have an impressive 23 options as well. That number would expand exponentially if you considered different package types, possible colors, etc…

Suffice it to say, our product offering is extremely large, especially when considering possible combinations. It takes a willingness to invest heavily in coating and winding capacity, as well as inventory, to produce what really is a small amount of product by volume.

After 35 years, our operators continue to get it done quickly, accurately and efficiently… impressive indeed.

We recently started a project to increase our capacity in PTFE Coated Fiberglass Braided Tie Cords and Lacing Tapes.  We’ve seen an “uptick” in this area recently and we want to be sure to keep safety stocks in place and then quickly respond to larger orders. We are committed to the markets we serve, and we are quick to invest when it makes sense.

In this case, we were reviewing our forecasts and made the call to add capacity. Note: PTFE Coated Fiberglass Lacing Tape is a flat braid, while PTFE Coated Fiberglass Tie Cord is a round braid.  Without getting into the details, it takes different kinds of braiders to make flat versus round braid. Braiding equipment is typically available, but like everything else around here, “off-the-shelf” requires our Maintenance Shop to works its magic and modify these braiders to meet our unique needs.  Running PTFE coated fiberglass yarns on braiders is not a “plug and play” operation.

So, let’s look at some of the more common specifications we’re dealing with in this product group. 

Round Braided PTFE Coated Fiberglass Lacing Tape:

                MIL-C-20079, Type III, Class 4                  W.F. Lake Corp. P/N: E761-1330

                MIL-C-20079, Type III, Class 6                  W.F. Lake Corp. P/N: E761-314SS

                MIL-C-20079, Type III, Class 3                  W.F. Lake Corp. P/N: R753-24

Flat Braided PTFE Coated Fiberglass Tie Cord:

                A-A-52083B Size 2                                          W.F. Lake Corp. P/N: E779-303

                A-A-52083B Size 3                                          W.F. Lake Corp. P/N: E779-476

                A-A-52083B Size 4                                          W.F. Lake Corp. P/N: E779-680

                A-A-52083B Size 5                                          W.F. Lake Corp. P/N: E779-1075

                A-A-52492, Item 2.1.1                                  W.F. Lake Corp. P/N: R755-24

                MIL-T-43435B                                                 W.F. Lake Corp. P/N: E779-303

The Marshall Space Flight Center along with NASA/TP-1999-209263, Multilayer Insulation Materials Guidelines lists all our PTFE Coated Fiberglass Lacing Tapes and Tie Cords in their reference literature, as well as Teflon coated fiberglass sewing thread (Teflon* is Chemours trademark name for PTFE).

It’s worth noting that we manufacture lots of other lacing tapes and tie cords that meet other A&D specifications, and we’re always developing new products to meet ever-changing customer needs.

Braided PTFE coated fiberglass tie cords and lacing tapes are one of the many product groups we manufacture right here in our Northern NY facility.  We’re proud to say they are Made in the USA!

The idea of Vertical Integration is once again gaining steam for manufacturing operations. The pendulum that swung over to outsourcing is swinging back to vertical integration. Here’s a link to a “pre-covid” blog post we put up in September of 2018.  VERTICAL INTEGRATION.   It’s worth a quick read again in light of this new-found (history repeating itself) understanding of the benefits of vertical integration. 

It’s easy to look at a Profit and Loss Statement and determine what your labor and raw material costs are.  A simple answer to a CEO looking to cut costs is to say, “if we stop making input material X, and just buy it from some other company, we can dump all of this labor and carrying cost” … simple.  The savings can start tomorrow.  OK, go for it!  But wait a second, does anyone in the board room understand how that operation keys into the overall Jenga game that is your business?

But as the pendulum swings, the realization has come that dropping that labor and equipment also means eliminating the immense knowledge base that took years to build, it means slowing down new product development, it means giving up total quality control, it means dragging out “fail-fix” cycles that drive innovation. And when you are manufacturing products that are often mission critical and safety critical, lost knowledge and loss of quality control is a risky proposition.

Now, of course, no company can do everything and trying to do so creates a lumbering giant of a beast that can be impossible to tame.  So, you must be smart and realistic about your options for vertical integration.

Let’s look at one of our product groups. We at W.F. Lake Corp. manufacture our PTFE coated fiberglass tie cords, lacing tapes and draw cord in-house.  No, we don’t manufacture fiberglass filaments, that is simply not within our reach.  But we pretty much take it from there.  Here in our Northern New York factory, we twist fiberglass yarns, we run coating lines to produce PTFE coated fiberglass yarns (individually coating each yarn with PTFE prior to braiding), we wind it onto braider bobbins, we do the braiding to make Teflon* coated tie cord, lacing tape and draw cord  and wind it once again onto the final customer specified package. (In some cases, we apply an anti-slip coating over the braided product).  And all along the way, we have our operators applying their extensive knowledge to produce these critical products.

By controlling the process from start to finish, we can quickly address any issues that arise, we can trace the yarns back to the raw material, we assure quality outcomes at every step of the process, we can innovate quickly, and we can adjust our scheduling internally to meet customer needs.  It’s all good. And it’s all due to smart Vertical Integration…something we’ve been pursuing for over 30 years.

Just a few days ago, Intuitive Machines’ spacecraft Odysseus made a soft landing on the moon and began beaming back information.  Quite impressive, indeed. Several countries are now teaming up with private sector businesses to make soft landings on the Moon.  (The SOFT landing is the hard part… that didn’t happen at all between 1972 and 2013).  Of course, the last manned mission to the moon occurred in December of 1972 through the massive Apollo Program. 

If you are as old as me, you may recall hearing perhaps the most famous quote of our times: Neil Armstrong in July of 1969… “That’s one small step for man, one giant leap for mankind”.  (Didn’t even have to Google it!).  My parents let me stay up to watch it live on Television! (I was a young boy, but old enough to remember the event).  That was Apollo 11.

Fast forward to today… it’s interesting that, once again, the moon has become a target.  For many good reasons, of course, but it’s not as easy as breaking out the old drawings from the Apollo missions and building a bunch of rockets.  And while there may be more computing power in your I-phone than on the Command Module, it’s not the same thing!  There are far more complicated equations to solve and, even though your phone might survive being accidentally dropped, that does NOT qualify as hardening for space travel!

Take a look at the LEM (Lunar Excursion Module “Eagle”) … an interesting combination of materials that looks like nothing seen before.  Tens of thousands of manhours went into inventing it and then building it.  Many companies, large and small, were tasked with solving difficult problems and coming up with new materials that simply didn’t exist prior to the manned moon missions. (BLOG POST JUNE 6, 2023 Small Manufacturers….).

So, again, it’s not as easy as breaking out the drawings and making a few phone calls… lots of the talent that figured all of this out is not available for consultation (retired, let’s say….)  and some of the companies that made the components are long-gone or have been gobbled up by larger competitors.

From a materials standpoint today, each component part must be sourced from modern supply chains or designed and manufactured to new standards and specifications. (SUPPLY CHAIN UPDATE)  And everything must be made to withstand the incredibly difficult environment of outer space!

But wait!  Some materials are, thankfully, still readily available from the sources specified way back in the 60’s and 70’s (that’s NINETEEN-60 and NINETEEN-70!!).  It happens that W.F. Lake Corp. is one of them.  (TIME LINE….).

It’s not that this stodgy little company is sitting here waiting for a call from NASA.  No, in fact these materials have found their way into many other mission-critical and safety-critical applications over the years. We’ve also added an impressive number of products to meet the latest challenges our customers bring to us. (NEW PRODUCT DEVELOPMENT Feb. 11, 2021).

 And of course, many of our products still work as designed for the most difficult applications of all… space flight!  The Marshall Space Flight Center references our products on their specifications! The full list of specifications we meet is available here.

So, when wires need to be bundled together, just give us a call.  We still manufacture the PTFE coated fiberglass lacing tape and tie cord developed for the original space missions.  And our PTFE coated fiberglass sewing thread is still available for fabricating space suits!  Our PTFE coated fiberglass yarns are ready to insulate the wires and cables running throughout the spacecraft and form the harnesses keeping it together. 

Finally, many of us remember another famous quote from that Apollo 11 mission: “Houston, Tranquility Base here. The Eagle has landed.”!! Let’s rise to the challenge and go back again!

We here at W.F. Lake Corp. are ready and waiting with our tried-and-true PTFE Coated Fiberglass products!  Time tested and proven in the most demanding environments on earth… and “to infinity and beyond!” (Quoting Buzz Lightyear for the younger readers… couldn’t resist!).

Can I repair my Teflon* coated fiberglass screen print dryer belt in the field? We often get that question. As usual, the answer depends on the damage done and the amount of wear the belt has experienced.

W.F. Lake Corp. has been manufacturing these belts for quite some time, and we’ve seen some pretty creative repairs made…literally duct tape and bailing wire (but no bubblegum yet)! Truthfully, screen printers are a creative bunch (kinda’ have to be, right?) and often make repairs using whatever is lying around the shop.

We’ve seen ragged cuts from carts that bumped against a running belt; burnt areas created when a belt stopped and sat too close to an IR heater; cuts made when unboxing a new belt; torn edge trim when a belt tracked off the pulleys; broken splices from over-tensioning, etc.  And, of course, lots of belts that are just worn out.

So, can I fix it myself? If it involves simply patching a small hole or sewing on a piece of edge trim, the answer is yes. Use one of our repair kits to put it back into service. If the metal lacing pulled out, give us a call to discuss your options.  If, however, the damage is severe or it is a pulled or torn splice, it probably cannot be fixed in the field but we may be able repair it at the factory. And if the belt is just plain worn out, we usually suggest a new one since the required thermal welding bonds are inhibited by dried inks that may have penetrated the coating.

Whatever the cause, we’re always willing to help out to see if it can be fixed, either in the field using one of our repair kits or sent back to us for investigation / factory reconditioning. It’s worth noting that some customers purchase a new belt and then return their old belt for review to see if it can be repaired and used as an “emergency backup” belt.

The operating characteristics of PTFE coated fiberglass belts are pretty impressive and if care is taken, these belts last a long time. Give us a call, e-mail us a question or ask for a quote out of curiosity. Check out how to measure a belt for the most easy and accurate way to give us the dimensions you need…each of our belts is custom made to your specifications!

Note: Before starting a new Teflon* coated fiberglass screen print dryer belt, be sure to check out our Belt Startup & Operation data.

*Reg. Chemours

Zip Ties: A handy little time saver. They certainly have their place but…

How many creative ways have you used a zip-tie?  I personally have used them to wrap tarps around a wood pile, hold up fencing to prevent deer from eating my bushes, act like a belt in a pinch, replace a broken buckle on my waders, temporarily hold a pipe while I applied a real clamp… heck, I’ve even used them to bundle wires together (imagine that!).  But while the cheap ones from the hardware store are convenient, they have their limitations.  Even the best, USA made ty-wraps used by industry for serious applications have their limitations.  That’s where PTFE coated fiberglass lacing tape comes in!

While a zip tie (tie wrap, cable tie, wire tie, etc.…) is convenient, there are places where the convenience of these ties cannot be employed.  Regardless of what the tie-wrap is made of, it cannot provide the performance in the most demanding environments that a W.F. Lake Corp. PTFE coated fiberglass lacing tape or PTFE coated fiberglass tie cord can provide. And of course, our products are Made in the USA!

PTFE coated fiberglass will not burn or support flame, is unaffected by virtually any chemicals, will not rot or support fungus and is unaffected by UV light.  These amazing operating characteristics make them suitable for applications where other cable ties would quickly fail.

W.F. Lake Corp. braided lacing tapes and tie cords are used where failure could be very expensive at the least and catastrophic at worst. Most would be considered Mission Critical.  By its nature, a braided product offers a load sharing function between fibers that enhances flexural strength second to none.  The fact that our PTFE coated fiberglass lacing tapes and tie cords are PTFE coated prior to braiding means that mechanical transmission of the load within the braid is much more effective and dramatically reduces the tendency of uncoated fiberglass yarns to abrade against each other.

Where wire ties fail, our flat braided PTFE coated fiberglass lacing tapes and round braided PTFE Coated Tie Cords shine.  Many specifications call them out by W.F. Lake Corp. part number.  Following are a few of them:

Military Specifications:

– MIL-C-20079, Type III, Class 4; W.F. Lake Corp. Part No.: E761-1330

– MIL-C-20079, Type III, Class 6; W.F. Lake Corp. Part No.: E761-314SS

– MIL-T-43435B; W.F. Lake Corp. Part No.: E779-303

– A-A-52083B, Size 2; W.F. Lake Corp. Part No.: E779-303

– A-A-52083B, Size 3; W.F. Lake Corp. Part No.: E779-476

– A-A-52083B, Size 3; W.F. Lake Corp. Part No.: E779-680

– A-A-52083B, Size 4; W.F. Lake Corp. Part No.: E779-1075

Marshall Space Flight Center:

-Table 4.5.2, Lacing Tapes and Tie Cords

               –E779-222, E779-303, E779-476, E779-680, E779-1075, E761-314, E761-668, E761-1330

NASA:

NASA/TP-1999-209263- Multilayer Insulation Material Guidelines.

-Table 14: Lacing Tapes and Tie Cords

               -Flat Braided Lacing Tapes, PTFE coated before braiding.

                              –E779-222, E779-303, E779-476, E779-680, E779-1075

               -Round Braided Lacing Tape (Tie Cord), PTFE coated before braiding.

                              –E761-314, E761-668, E761-1330

ASTM International, D578 / D579M:

-Standard Specification for Fabrication of Flexible Removable and Reusable Blanket Insulation

 for Hot Service:

               –PTFE Coated Tie Cord and Lacing Tape

Remember that we also manufacture a wide range of PTFE coated fiberglass sewing thread and PTFE coated fiberglass draw cord products as well.

OK, so any creative uses for the PTFE Coated Fiberglass Lacing Tapes and PTFE Coated Fiberglass Tie Cords we make here?  Of course, but don’t tell the boss!

Many small manufacturers play key roles in supplying our most critical products, supporting mission critical and even safety critical applications. We’re proud to say that we here at W.F. Lake Corp. have been manufacturing “Made in the USA” mission critical products for over 30 years.

It is interesting to note that W.F. Lake Corp. was specifically identified as one of many small businesses that are critical suppliers of products to the U.S. Government for space related applications.  Recently, we were contacted directly by the U.S. Department of Commerce / Bureau of Industry and Security in coordination with the U.S. Airforce, NASA, and the National Reconnaissance Office (NRO) to complete a survey (required by law) in assessment of supply chain sustainability across the defense, intelligence, civil and commercial space sectors… also known as the Defense Industrial Base Assessment, or the U.S. Space Industry “Deep Dive” Survey.  The goal was to determine how robust the space sector is considering how many small businesses are involved in its success. We are pleased to have completed this in-depth survey advising that our portion of this critical supply chain is Made in the USA and is in good standing going forward as far into the future as anyone could see.

W.F. Lake Corp. manufactures high performance, PTFE coated fiberglass yarns, PTFE coated fiberglass sewing threads, PTFE coated fiberglass tie cords and lacing tapes used in a variety of industries including aerospace, defense, air filtration and plant / personal safety, among others. Our products are considered “mission critical” in that they are necessary for a successful outcome in virtually every environment they operate in.  In many cases they are considered “safety critical” where failure may result in serious environmental damage, injury, or loss of life. 

The impressive operating characteristics of PTFE coated fiberglass yarns, PTFE coated fiberglass sewing threads, tie cords and lacing tapes are why they are specified / approved for use by many aerospace and defense companies and even by NASA and the Marshall Space Flight Center itself. (Often with W.F. Lake Corp. as sole source of supply). The full list of specifications we meet is available here.

Applications include PTFE coated fiberglass yarns used to manufacture wire and cable products that perform critical engine control functions in commercial and military aircraft, operate de-icing boots, function as over braids on engine compartment wire harnesses, etc..  These same yarns are braided into PTFE coated fiberglass tie cords and lacing tapes that bundle wiring together inside airframes, tie insulation on spacecraft, insulate naval ship-board engines and drives, etc…

PTFE coated fiberglass sewing threads and PTFE coated fiberglass draw cords are also used in other industries for mission critical applications, including fabrication of safety spray shields in chemical processing plants, flu-gas filtration media and high temperature insulation jackets to both conserve energy and protect personnel from exposure to extreme temperature or chemicals.

W.F. Lake Corp. products have been performing flawlessly in these mission-critical applications for over 30 years.  We take pride in the fact that we support some of the most critical aerospace / defense and safety sectors in the Country (and beyond). We are continuously working with customers and vendors to improve performance and safety, and possibly reduce costs, but other than minor “tweaks”, we always come back to the proven solution in these most critical applications, that is, PTFE coated fiberglass.  When lives are on the line, changing from known solutions is never taken lightly.  PTFE coated fiberglass is often the best and only option available in these most critical applications. Our team, along with our vendors and customers, is proud to offer solutions to the most challenging applications in the world.

First, what the heck is that in the picture above?  Read on… we’ll get to that.

Effectively managing limited resources is the hallmark of a successful business. If you’ve successfully navigated the last few years, congratulations! You have managed limited resources effectively.

When it comes to limited resources, we are always asking ourselves how can we do better? Without establishing a windfarm or solar farm, for example, how can a small manufacturer work to conserve natural resources?  At W.F. Lake Corp., we’ve already made all the obvious moves, including increased insulation, sealing off air leaks, new and more efficient motors and drives, recapturing excess heat, LED lighting, recycling, etc…

So, how else can a small manufacturer of PTFE coated fiberglass products contribute to better outcomes?  How about focusing more keenly on something that successful manufacturers have been doing all along… re-use, re-cycle, re-pair, re-capture.

As you may have read in my post on shops, we have always had our own fabrication and maintenance shop. We intimately understand all the maintenance and repair needs of each unique piece of equipment we own. When we do take a piece of equipment off-line, we will break it down carefully and hang onto any parts that can be used as spares in other equipment.  Even the steel, for example, gets used again if it makes sense to keep it. Re-use beats recycle every time (and what doesn’t make sense to salvage goes to the recycler, of course). Rebuilding an electric motor and placing it in “spares” saves lots of resources… think of the energy, landfill space, transportation fuels, etc., that are NOT consumed when a simple rebuild / re-use happens.

We also take care to optimize the use of energy in our operations. Producing PTFE coated fiberglass products (including PTFE coated fiberglass sewing threads, fabrics, adhesive tapes, and PTFE coated fiberglass belts) requires heat.  We are fortunate to have clean and abundant natural gas available as an energy source for our coating operation. By moving air thoughtfully throughout the facility and recapturing heat, we rarely need to run the overhead heaters here in our cold Northern New York winters. We conserve lots of this limited natural resource by making the most of what we do consume.

So, what about that picture? It’s a scissors sharpener! A very cost effective/green activity is simply sharpening scissors rather than throwing them in the recycle bin.  As mentioned, we manufacture a wide variety of PTFE coated fiberglass sewing threads, PTFE coated Kevlar* sewing threads and PTFE coated fiberglass yarns.  You can imagine how often we use scissors here and how tough fiberglass and Kevlar* are on the cutting edges. Tossing dull scissors in the recycle bin is neither “green” nor cost effective.  Sharpening scissors in-house makes sense from a “green” standpoint and a financial standpoint.  It may seem inconsequential but keeping small items out of the landfill or recycle bin adds up over time.

Manufacturers have particular interest in being as efficient as possible in their every-day operations. Whether from the standpoint of shop / office supplies, raw materials, or energy, being efficient leads to “greener” outcomes every day. To do otherwise will not only adversely affect the environment, but it will also mean you aren’t going to survive very long as a viable business.

In my travels to customer’s and supplier’s manufacturing sites over the years (not so much lately), one thing I’ve always noticed was that most had a nice little maintenance / fabrication shop that was key to supporting their ongoing operations. They also had a couple of highly skilled mechanics or millwrights with extensive knowledge of the operation running these shops. For some reason, I always thought those were the coolest little “operations within an operation”, almost acting like their own little business. I’m proud to say that we, too, have a nice little maintenance / fabrication shop within our facility, staffed as noted above by a couple of highly skilled and uniquely talented individuals.

But why do these businesses have these neat (sometimes not-so-little) shops? Isn’t everything highly automated and run by computers? The answer is that even the highest tech operations need people with skills and aptitudes to keep them running. In our case (and that of many of our customers and suppliers), we are running a wide variety of equipment that has unique needs. While we have our share of digital controllers, those controllers are supporting very mechanical operations. The many and varied products we manufacture require lots of equipment performing operations that need to be completed quickly and accurately.

In one part of our facility, for example, we run ring twisters that use all kinds of speed controllers, relays and timers. The ring twisters themselves employ belts, drives, spindles, feed rolls, timing gears, bearings, pulleys, springs, etc. The actual twist operation itself hasn’t changed much in the last hundred years, but speeds, accuracy and input materials have. All of these parts need regular attention and sometimes complete rebuilding. The large number of PTFE coated fiberglass sewing threads, PTFE coated Kevlar sewing threads, and PTFE coated fiberglass yarns that we manufacture means that we need lots of spindles operating effectively and efficiently. These ring twisters supply product to our coating towers, which in turn supply product to our high-speed winders and PTFE Coated Fiberglass Draw Cord and PTFE Coated Fiberglass Lacing Tape braiders. Our capabilities are many and varied and our level of vertical integration means that it must all run smoothly from start to finish. 

Every piece of equipment ultimately relies on our maintenance shop and mechanics to operate smoothly. Did I mention that our PTFE coated fiberglass fabric coating towers and converting equipment also supply our PTFE coated fiberglass belt operation?  Lots more equipment in that operation as well!

Some days you’ll catch our mechanics building simple carts or racks to improve material flow between departments, other days it’s a modification to an existing rewinder or a better mousetrap!  It’s always something and rarely boring.  These folks know what they’re doing and have an aptitude for it.  As with all our employees, we appreciate their efforts every day and we think it’s pretty cool to have our own maintenance / fabrication shop within our operation.

PTFE Coated Quartz Sewing Thread has some amazing properties. It operates continuously to 2,000 deg. F (1080 deg. C), making it among the highest temperature textile sewing threads available. Naturally, this performance capability comes at a cost…. but why?

Unlike fiberglass sewing thread, quartz thread is 99.9% pure silica! Fiberglass is nominally 60% silica and “silica” yarns are about 94% pure silica. The purity of Quartz yarn is what enables very high operating temperatures. Excellent tensile and flexural strength make it suitable for use as a sewing thread in extreme thermal insulation applications. Principle applications in yarn or fabric form are military in nature with the majority consumed for defense purposes.

But in this post, we’re talking about high temperature sewing thread applications. PTFE coated Fiberglass sewing threads operate at about 1000 deg. F (E-glass thread). S-2 Fiberglass sewing thread operates to 1400 deg. F (S-2 fiberglass sewing thread with Inconel wire or stainless steel wire enables “fail-safe” operation at very high temperatures, but that is not a pure fiber sewing thread). How about Silica sewing thread? Silica yarns operate to 1800 deg. F, so why not go with a silica sewing thread for all but the most extreme temperatures? The problem is that silica yarn does not exhibit the same tensile and flexural strength as quartz or fiberglass. Silica yarn is produced by chemically leaching fiberglass yarns, thus increasing operating temperatures but degrading tensile and flexural strength. To overcome this weakness, silica threads are often twisted with Rayon yarn to enable sewing, but the Rayon is quickly consumed upon exposure to higher operating temperatures. PTFE coated Quartz sewing thread does not require the addition of Rayon or any other fiber to enhance tensile and flexural strength. Quartz yarns are not simply leached fiberglass yarns, rather they are manufactured by first mining a very high purity quartz ore or sand.  That sand is further cleaned and then processed in high temperature furnaces to produce a clear fused silica rod which becomes the feedstock for manufacturing quartz fibers. You can see where the cost comes into play with a quartz yarn or sewing thread.

Interestingly, a few years ago we were asked to produce a high temperature sewing thread using a customer-supplied silica yarn without adding a Rayon fiber, instead attempting to rely on the PTFE coating to enhance “sewability” and flexural strength. The results were unimpressive. We found the finished Silica sewing thread was weaker than fiberglass or Quartz thread in tensile strength by a factor of 4 to 5 times and weaker in knot strength by a factor of 11 to 12 times! The customer thanked us for our efforts and dropped the project.

So, when it comes to the highest temperature sewing thread available without the use of sacrificial fibers, PTFE coated Quartz sewing thread deserves a close look despite its high cost. In some cases, there simply is no alternative. We currently manufacture 5 sizes from TFQ-12 to TFQ-30. (Remember, however, that in most cases the cost of the actual thread used in the final product represents a small fraction of the overall cost of the finished product… sounds like an opportunity for another blog post… wait, we already wrote that one, and you can find it here!).

Thanks for taking a moment to read our latest post. As always, let us know if you have any questions or would like to see a sample.