Kevlar® Para-Aramid
Kevlar® Fiber is a high-performance para-aramid fiber developed by DuPont™, widely recognized for its exceptional tensile strength, low elongation, and outstanding thermal stability. Kevlar® delivers an excellent strength-to-weight ratio and is commonly used in demanding industrial, aerospace, defense, and reinforcement applications.
Kevlar® Fiber from Rocket-Fibers is supplied as a continuous multifilament yarn, precision-wound on textile spools for easy handling and efficient downstream processing. Multiple deniers and modulus types are available to support a wide range of technical requirements.
Fibers are available in both sample and factory spool sizes. Bulk quantities are offered for commercial use, with additional fiber processing services such as twisting, braiding, and custom coating available upon request. A customer-specific, batch-level Certificate of Analysis (COA), including full lot traceability, is available per request.
About This Item
Kevlar® Physical Properties Guide
Para-Aramid fibers such as Kevlar®, offer a multitude of properties that make them an excellent choice for various applications. Their exceptional strength-to-weight ratio and high break strength provides high tensile strength and modulus, making them ideal for applications requiring robust and durable materials. Para-aramid fibers are great solution for applications where the fiber will be under constant load, taking advantage of low elongation and creep properties.
Kevlar® Resistance Guide
Para-aramid fibers, such as 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, Kevlar® fibers demonstrate fair to good chemical resistance, enabling them to withstand short-term exposure to acids, alkalis, and many organic solvents without significant degradation. These fibers are not suggested for long term chemical 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 200
Short Term Exposure (°C): 420
Degradation Temperature (°C): 480
Kevlar® Technical Specifications
| Denier | 200 | 300 | 380 | 400 | 1000 | 1420 | 1500 | 1500BK | 2160 |
|---|---|---|---|---|---|---|---|---|---|
| Type | 29 | 129 | 49 | 29 | 29 | 49 | 29 | 100 | 49 |
| Modulus | Standard | Standard | High Modulus | Standard | Standard | High | Standard | Standard | High Modulus |
| Break Strength (lbf) |
10 lbf | 16 lbf |
21 lbf | 20 lbf |
50 lbf |
70 lbf | 75 lbf | 70 lbf | 107 lbf |
| Diameter* (mm, inch) |
0.165mm (0.0065") | 0.191mm (.0075") |
0.215mm (0.0085") | 0.233mm (0.0093") | 0.369mm (0.0178") | 0.415mm (0.0163") | 0.452mm (0.0178") | 0.452mm (0.0178") | 0.512mm (0.0202") |
| Elongation (%) |
~3.6% | ~3.0 | 2.4% | ~3.6% | ~3.6% | ~2.5% | ~3.6% | ~3.95 | ~2.4% |
| Denier Per Filament | 1.47 dpf | 1.45 dpf | 1.42 dpf | 1.48 dpf | 1.5 dpf | 1.42 dpf | 1.5 dpf | 1.5 dpf | 1.42 dpf |
| Filament Count | 136 | 206 | 267 | 270 | 666 | 1000 | 1000 | 1000 | 1500 |
| Finish Content (%) | 1-2% | 1-2% | 1-2% | 1-2% | 1-2% | 1-2% | 1-2% | 1-2% | 1-2% |
| Yield (lb/1000 ft) | 0.015 | 0.022 | 0.028 | 0.030 | 0.074 | 0.106 | 0.112 | 0.112 | 0.161 |
| Yield (ft/lb) | 66,660 | 45,450 | 35,710 | 33,330 | 13,510 | 9,430 | 8,920 | 8,920 | 6,210 |
*Calculated Diameter
Kevlar® Performance Highlights
- High strength: Exceptional strength relative to weight, ideal for load-bearing and reinforcement applications.
- Low Elongation: Maintains dimensional stability under sustained tension and cyclic loading.
- Impact Resistance: Excellent energy absorption and resistance to sudden impact.
- Abrasion Resistance: Withstands repeated wear in demanding mechanical environments.
- Thermal Stability: Maintains mechanical integrity across a wide temperature range and does not melt.
- Chemical Resistance: Resists many organic solvents and weak acids (see limitations).
- Flame Resistance: Naturally flame resistant and self-extinguishing.
- Electrical Insulation: Non-conductive with good dielectric properties.
- Long Service Life: Proven durability in harsh industrial and aerospace environments.
Kevlar® Para-Aramid Properties Table
The table below represents the nominal mechanical properties of Para-aramid fibers. Kevlar® fibers are sold in standard and high-modulus formats tailored for specific applications.
T29: Industrial/Standard Modulus T49: High Modulus T100: Black solution dope dye
| Property | Unit of Measure | T29 - Standard | T49 - High Modulus |
|---|---|---|---|
| Tenacity | g/d | 23.0 | 23.6 |
| Tensile Modulus | g/d | 555 | 885 |
| Specific Gravity | ratio |
1.44
| |
| Avg. Elongation | % | 3.6 | 2.4 |
| Moisture Regain1 | % | 4.5 | 3.5 |
| Melt Point | °C |
N/A
| |
| Decomp. Temp | °C |
427-482
| |
| Creep2 | % |
< 0.03
| |
| Shrinkage3 | % |
< 0.02
| |
1 Equilibrium moisture regain @ 55% RH
2 Creep @ 40%-58% ultimate tensile strength
3 Shrinkage in dry air @ 177°C for 30 minutes
NOMEX® and KEVLAR® brand fibers are a registered trademark of E.I. Du Pont de Nemours and Company
Kevlar® Packaging Details
| Product | Spool Size | Quantity | Tube Dimensions
|
Tube Sizes |
|---|---|---|---|---|
| All Sample Sizes | Sample Spool | 0.25 lb | Standard Tube Dimensions
|
3.7" x 8.5" |
| 200 - 400 Denier | Factory Spool
|
2.0 lb | Standard Tube Dimensions
|
3.7" x 8.5"
|
| 1000+ Denier | Factory Spool | 5.0 lb | Standard Tube Dimensions
|
3.7" x 8.5"
|
Talk With A Fiber Expert