At present, there are various types of carbon fiber cloth sold in the market, and the product specifications are different, so the prices are also different. In order to obtain more profits, some merchants rely on price to compete in the market, resulting in products that cut corners and even use fake carbon filaments. So how to identify the authenticity of carbon fiber?
1. Take a look
Carbon fiber cloth is only one kind of carbon black, the color is bright, the false color may be black, but the color quality is dull and dull. The difference can be clearly seen by looking at it. The color of real carbon fiber cloth is bright, uniform, and original color, while the color of fake carbon fiber cloth is much duller, dry, uneven, and dyed.
2. Burn and burn
Fake carbon fiber cloth is flammable and turns into light yellow, white or other colors of ash after burning. And the real carbon fiber cloth, its tow is relatively black and bright, it will not curl when it is burned with fire, it will turn red like a thin iron wire, and it can be restored to its original shape after burning for a short time. (Dangerous action, it is generally not recommended to try it if it is not necessary)
3. Touch
Touching can also help us identify whether it is true or false. The real carbon fiber cloth feels soft and light to the touch. And by touching, you can also feel whether the carbon cloth is flat, whether the tow is straight and even, whether there are appearance defects such as weft weft or broken warp, so as to further judge whether the quality of the carbon fiber cloth is qualified.
4. Pull
The strength of real carbon fiber cloth is very high. It is clearly stipulated in GB50367-2013 "Code for Design of Reinforcement of Concrete Structures" that the tensile force of carbon fiber composite primary cloth must reach 3400 MPa, and the tensile elastic modulus is ≥ 2.3x105 MPa. Elongation ≥ 1.6%. The fake carbon fiber cloth has extremely low strength and may be broken by hand. Therefore, it is very important to look for products that meet the testing standards of the National Inspection Center for tensile strength and bending strength before purchasing!
Therefore, when we purchase carbon fiber products, we still have to choose regular manufacturers to purchase.