Meta-aramid sewing thread 403 for sewing fire-resistant clothing and high-temperature filter bags

Meta-aramid sewing thread 403 is a high-performance sewing thread made from aramid 1313 fiber (poly-m-phenylene isophthalamide) through twisting and plying processes. Its model number "403" typically indicates 40-count yarn, 3-ply twisted, with high-strength, temperature resistance, flame retardancy, and corrosion resistance characteristics. It is specially designed for sewing needs in high-temperature and high-risk environments.

1. High Temperature Resistance and Flame Retardancy

Temperature Resistance: Long-term temperature resistance of 220℃, short-term tolerance of 300℃ high temperature, limiting oxygen index (LOI) >28%, non-melting and non-shrinking when encountering fire.

Flame Retardant Properties: Only carbonization occurs during combustion without dripping, avoiding secondary burns, suitable for fire suits and high-temperature filter bag sewing.

2. Mechanical Properties

Linear Density: 40 count/3 ply (approximately 120D), tensile strength ≥15N (single thread), elongation at break <5%, not easy to break during sewing.

Abrasion Resistance: Strength retention rate >85% after 500 friction cycles, suitable for high-wear parts (such as protective clothing joints).

3. Chemical and Environmental Stability

Resistant to weak acids, weak alkalis, and organic solvents (such as ethanol, acetone), excellent hydrolysis resistance, and tolerance to humid and hot environments (such as chemical plants, marine operations).

UV resistance is weak; long-term outdoor use requires UV-resistant coating or dark-colored fabrics.

4. Sewing Adaptability

Adaptable to industrial flat sewing machines and lock-stitch machines. Recommended needle size: #14-18 (high-temperature resistant needles), sewing speed ≤5000 rpm.

Can be dyed in golden yellow, black, etc. (the original yarn is light yellow), color fastness ≥ grade 4.

Application Areas of Meta-aramid Sewing Thread

1. High-Temperature Protective Equipment Sewing

Fire suits and arc protective clothing: Used for sewing key parts such as seams and pockets, withstanding direct flame burning and preventing wire breakage leading to protective failure.

Welding suits and metallurgical work clothes: Sewing high-temperature reflective strips or heat insulation layers, withstanding molten slag splashes (temperature reaches 200-500℃).

2. Industrial Filtration and Sealing Products

High-temperature filter bag sewing: Used for seam reinforcement of dust filter bags in cement plants and steel plants, withstanding 200-260℃ dust and acidic gas corrosion.

Asbestos substitute sealing gasket: Sewing the edges of aramid felt sealing gaskets, withstanding high pressure (10-30 MPa) and chemical media corrosion.

3. Aerospace and Bulletproof Equipment

Flight suits and parachutes: Sewing high-temperature flame-retardant flight suits, withstanding sudden fires in the cockpit; reinforcing parachute rope connections, resisting dynamic impact.

Bulletproof equipment stitching: Used for interlayer fixation of bulletproof vests and helmet linings, preventing seam breakage under high-speed impact.

4. Special Transportation and Construction

Race car fire-resistant interior: Sewing race car seats and in-cabin fire blankets, withstanding high temperatures in the engine compartment (150-200℃).

Building fire curtains: Seaming multi-layer aramid fabric fire curtains to slow the spread of fire.

Meta-aramid sewing thread 403, with its high-temperature resistance, flame retardancy, and high-strength durability, has become a sewing material in high-temperature protection and industrial filtration fields. Its performance is significantly superior to traditional chemical fiber sewing threads, and in fire protection, metallurgy, and aerospace applications, it can effectively improve the safety and service life of equipment. With the maturity of domestic technology, its application in civilian protective equipment and new energy equipment (such as lithium battery fire-resistant packaging) will be further expanded.

E-mail:
gdkaidun@163.com

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86-131-3828-6677

Address:
Room 401, Building 21, No. 1, Keqing Road, Yundonghai Street, Sanshui District, Foshan City, Guangdong Province