Para-Aramid Thread

Rocket-Fibers' Para-Aramid thread offer unique properties which make them desirable in a host of applications and products.  These threads are unlike typical spun threads, outperforming them in strength, heat resistance, and durability.

Our Para-Aramid threads are offered in various sizes, colors and lengths. The thread is conveniently wound and provided on a 5/8" x 5 1/4" cardboard tube, for convenient handling..  Full sized factory spools supplied on plastic bobbins.  Larger volumes are also available.  Additionally, each order includes product certification, guaranteeing the authenticity of your fiber purchase. 

Tex & Color (g/1000m)
Length (ft)
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About This Item

Product Tech Specs

Fiber Type
# of
Diameter Break Strength Elongation % Yield
Spool Size
126 (14) Para-Aramid
0.13mm (0.005") 2 lbs (9 N) 2-4%96,000 FT
144 (16) Para-Aramid
0.14mm (0.0055") 3 lbs (13N) 2-4%84,000 FT
180 (20) Para-Aramid
0.15mm (0.006") 5 lbs (22 N) 2-4%60,000 FT2 LB / 120K FT
315 (35) Para-Aramid
0.22mm (0.009") 11 lbs (45 N) 2-4%36,000 FT0.5 LB / 18K FT
450 (50) Para-Aramid
0.26mm (0.010") 15 lbs (67 N) 2-4%24,000 FT
630 (70) Para-Aramid
0.31mm (0.012") 24 lbs (89 N) 2-4%18,000 FT
1 LB / 18,000 FT
945 (105) Para-Aramid
0.36mm (0.014") 27 lbs (120 N) 2-4%12,000 FT
1080 (120) Para-Aramid
0.38mm (0.015") 31 lbs (138 N) 2-4%11,700 FT
1215 (135) Para-Aramid
0.41mm (0.016") 41 lbs (182 N) 2-4%10,800 FT0.5 LB / 5,400 FT

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Product Details

  • Made with 100% Para-Aramid fibers
  • Splice free, 1 continuous length per tube
  • Longer and custom lengths available

Tube Size & Dimensions

  • Supplied on a Wardwell 3/8" x 5 1/4" cardboard tube
  • Larger volumes supplied on king spools
  • Product Performance

    • Optimal combination of strength, smoothness, and durability
    • Good tensile strength and abrasion resistance
    • Outstanding high heat and flame resistance
    • Excellent flex and sew-ability 

    Para-Aramid Resistance Guide

    Para-aramid fibers, such as Alkex® & Kevlar®, exhibit excellent resistance to high temperatures, maintaining their mechanical properties even at elevated temperatures. This heat resistance makes them suitable for applications in thermal insulation and protective clothing. Additionally, para-aramid fibers demonstrate good chemical resistance, enabling them to withstand short-term exposure to acids, alkalis, and many organic solvents without significant degradation.  Not advised for long-term exposure.

    This fiber will degrade with prolonged UV light exposure. These fibers will brown and weaken over time.  Please keep this fiber stored away in a dark room and in the UV protective bag the fiber was shipped in.

    This fiber will absorb atmospheric moisture up to 5-7% in weight. This fiber should be stored in a cool, dry room with low humidity. A desiccant bag was included with this fiber to prevent regain during transit and short-term storage at your facility.

    Acid: Prolonged exposure to concentrated strong acids will cause degradation
    Alkali: Degrades with prolonged exposure to Sodium Hypochlorite
    Organic Solvent: Moderate degradation in Carbon Tetrachloride and Ethylene Glycol

    Continuous Operating Temperature Range (°C): -40 to 300
    Short Term Exposure (°C): 420
    Degradation Temperature (°C): 480

    Suggested Applications

    • Aerospace & Mlitary Sewing Threads
    • Fire and Flame Safety
    • Industrial Safety Gear
    • Medical Textiles
    • Embroidery
    • Strength Member

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