Kevlar® thread is one of the strongest and most fire retardant commercially available
Piecing and quilting thread can last 50+ years.
The results indicate that polyester thread is stronger than cotton and rayon thread, and that cotton thread is stronger than rayon thread. The polyester thread was able to hold the most weight.
Polyester makes a strong durable thread suitable for all types of sewing. Polyester thread doesn't shrink or fade when washed. And polyester thread doesn't produce a lot of lint, which helps keep you machine clean. Most of the “all purpose” thread at fabric and craft stores is 100% polyester.
The thinnest, strongest thread is a Kevlar strand made from high-strength carbon fibers that are almost indestructible and decomposes at 800°F. This type of thread is used in applications like bulletproof vests, aircraft wings, and ski bindings because it's the strongest and most durable material available.
A nylon thread is actually stronger than a steel wire.
First, Kevlar® thread is typically more than twice as strong as polyester or nylon threads. Second, Kevlar® thread has very little stretch, which helps hold a very tight seam. Third, Kevlar® thread has a very high heat tolerance and does not melt like other fibers. Instead, Kevlar® thread decomposes around 930 °F.
There are three standard thread series in the Unified screw thread system that are highly important for fasteners: UNC (coarse), UNF (fine), and 8-UN (8 thread).
With so many natural fibres known for its tensile strength, silk is the toughest natural fibre found in our nature.
Hold a strand of thread up to a light and inspect how many fibers fan out from the strand. A good quality thread will be tightly spun together so that few fibers deviate from the strand. It's not like a string of steel; you'll always see SOME loose fibers (kind of like rope).
Polyester Quilting Threads
Polyester is far stronger than cotton, and as a result, you can find this thread in significantly smaller sizes than cotton will be available in because the thread will still retain its strength, even at a super fine size like 100wt.
Nylon. Nylon is one of the strongest synthetic threads in use today. It has a high strength-to-size ratio in comparison to polyester thread and is also known for its flexibility and stretch. The high tensile strength of nylon makes it ideal for heavy fabrics used in home décor.
What Does Heavyweight Thread Mean? In IT, a heavyweight thread is a thread that has a sophisticated context and requires the processor to do more work to order its execution.
With a high strength to weight ratio, nylon is one of the strongest threads available, making it a great choice for stitching upholstery, leather, and vinyl.
Material: For most bag sewing applications, thread is offered in four materials listed here in decreasing strength: Nylon (strongest), polyester, polyester/cotton blend, and cotton (weakest).
Bonded nylon thread does not rust, or rot if vibrant colors are chosen. It doesn't fade or shrink quickly, either.
Kevlar® thread is one of the strongest and most fire retardant commercially available threads. It is about 2.5 times stronger than nylon or polyester, has almost no stretch, does not melt, and decomposes at 800°F.
Thicker than the regular Gutermann Sew-All Thread, Gutermann Extra Strong is, as the name suggests, extra strong! It's the right thread for all seams subject to high wear and tear. It's also UV resistant, so suitable for use in outdoor applications.
Nylon sewing thread has a higher strength to linear density ratio (Tenacity) than Polyester. Tenacity is commonly expressed as grams per denier (gpd) with High Tenacity (HT) polyester typically running 9.0 gpd and Nylon 6,6 at 10.0 gpd. So if strength is the only consideration, nylon would appear to be the best choice.
There are two common forms of threads: straight threads and tapered threads. Straight threads have a parallel profile that remains the same diameter throughout the part. Tapered threads taper along with the thread profile and become smaller in diameter as the part moves down.
Technora, which is an aramid made from two diamines, has many high-performance properties. It is heat and chemical resistant, and it is said to be much stronger than steel. Due to Technoras' extreme durability and strength, the fiber is used often in industrial applications.
Durability. In terms of overall durability, both UHMWPE and Kevlar rank high above other industrial fibers. However, UHMWPE fibers like Spectra and Dyneema exhibit resistance five times higher than Kevlar—even using just half the number of synthetic materials.
Kevlar thread is expensive. It should only be used to sew material that has similar qualities.