跳至主要内容

The Aramid fiber testing Guide For Everyone

 Aramid fibers, which include brands such as Kevlar and Twaron, are known for their incredible strength, heat resistance, and durability. They are a class of heat-resistant synthetic fibers that are extensively used in aerospace, military applications, body armor, but also in a variety of everyday applications like rope, cables, safety equipment, etc. 



When dealing with aramid fibers, there are specific tests that are typically utilized to ensure their quality, performance, and reliability. Here is a simplified guide to understanding how these are tested:


1. Tensile Testing:

The tensile strength of aramid fibers or materials made from them is exceptionally high. Tensile strength is tested using methods like ASTM D7269/D7269M - Standard Test Methods for Tensile Testing of Aramid Yarns. It measures the breaking strength and elongation of the yarn. The force needed to rupture an aramid fiber is usually significantly higher than other types of fibers indicating its superior strength and utility in heavy-duty applications.


2. Heat Resistance Testing:

Aramid fibers have a high degradation temperature and exhibit good thermal stability. This means they can retain strength and resist decomposition at high temperatures. Heat resistance can be tested using thermogravimetric analysis, where the fibers are heated and the temperature at which decomposition occurs is measured.


3. Flame Resistance Testing:

Similarly, aramid fibers are flame-resistant. They are self-extinguishing and do not melt or drip when exposed to flame. Various flame tests can be conducted to test this property such as the ASTM D6413/D6413M - Standard Test Method for Flame Resistance of Textiles (Vertical Test). This test measures the flame resistance properties of the fibers.


4. Fatigue Testing:

This test is performed to understand the lifespan of the fibre under cyclic loads. This is particularly important for aramid fibers used in applications such as ropes, where they are subjected to continuous load alternations. 


5. Chemical Resistance Testing:

The resistance to chemicals ensures aramid fibers maintain their integrity in corrosive environments. Aramid fibers are resistant to most organic solvents and chemicals but are sensitive to strong acids and alkalis. The resistance to specific chemicals may be carried out by exposing the fiber to the chemical and subsequently testing for changes in physical and mechanical properties.


6. Moisture Absorbency Testing:

Aramid fibers have low moisture absorbency. A test to evaluate this property may involve exposing the fibers to a humid environment and measuring any change in their weight.


7. Dielectric Strength Testing:

Aramid fibers are non-conductive and have a high dielectric strength (resistance to electric breakdown). This property is relevant for applications in electronic and electrical equipment.


8. Ballistic Resistance Testing:

For materials like Kevlar, which are used in the production of body armor, there's also ballistic testing to measure the material’s ability to stop bullets and other high-speed projectiles. This is usually done following protocols like NIJ Standard-0101.06 for Ballistic Resistance of Body Armor.


9. Density Measurement:

The density of aramid fibers is another important factor that is typically measured.


10. Color Fastness:

For colored aramid fabrics, tests like AATCC Test Method 16 for Colorfastness to Light, and AATCC Test Method 61 for Colorfastness to Washing maybe applied.


Remember, the exact testing requirements would depend on the specific application and end use of the aramid fibers. This contributes to the variety and complexity of standards and methods available to the industry, meaning careful selection of testing regimen is required. Professional product testing services with experience in aramid fibers can be utilized for best results.


Also, testing standards and methods may evolve over time as new technologies, applications, and testing methods are developed. So, it is useful to periodically review requirements and check for the latest relevant standards and methods.

评论

此博客中的热门博文

Multi-Functional Scratch tester For automotive interior materials

          Multi-Functional Scratch tester is applicable to all types of wiping performance test of automotive interior materials; test equipment integrated three domestic standards (fingers scraping method, a hundred grid method, and plastic scraping finger scraping method).         Scratch tester is an electronic instrument capable of measuring critical load, adhesion, scratch resistance and bond strength for a wide range of surfaces. Scratch tester measures the scratch resistance of a sliding and moving surface in the relative motion to a stylus. The stylus is forced/pressed against the moving surface with precise controlled force which is normal to the surface and tangential force at the contact has to be measured.         Scratch tester can be utilized for all type of industrial coating from the plasma layers used in semiconductor and optical technology used in decorative coatings used for automotive and consum...

Reveal the standards for textile breathability testing and let you understand it in seconds!

 Reveal the standards for textile breathability testing and let you understand it in seconds! Breathability testing is a measure of how much gas can pass through a textile. However, there is no single "optimal" air permeability value, as it depends on the specific circumstances in which the textile is used. For example, if it is used to make sportswear, it is hoped that it has good breathability; if it is used to make insulating clothes or warm clothes, it is hoped that it can block the cold well. Therefore, when testing the air permeability of textiles, the purpose of using the textile must be clearly understood in order to obtain reasonable values. In order to accurately and quickly test the true breathability performance of a sample, specially designed and developed instruments must be used. Testing methods generally include: fabric thickness (Thickness), fabric density (Density), fabric water absorption rate (Water Absorption Rate), evaporation and mass transfer (Moistur...

Test Methods of Universal Pilling Assessment Viewer (PAV)

Universal Pilling Assessment Viewer enables fabric to be assessed while still mounted on a Martindale head. The Pilling Assessment Viewer (PAV) for the textile market has been developed with the help of a major textile company in accordance to BN EN ISO 12945 standards incorporating all 3 parts and adopting the following test methods: Part 1: ICI Pilling box method (BS 5811) Part 2: Modified Martindale method (SN 198 525) Part 3: Atlas random tumble method (ASTM D 3512-96) It uses D65 Artificial Daylight (with CWF optionally available), as specified by many retailers. Other test methods can also be viewed, including those specified by major retailers. Other results of test methods that can be viewed include: BS 5811:1986 Determination of resistance to pilling and change of appearance of fabrics. ICI modified pill box for snagging Fleece appearance and surface change after washing Other test methods as specified by several major retail outlet. To optimize c...