Six identification methods of PVC board

In fact, we know that the flow characteristics of PVC plastic sheets are quite poor, and the process range is very narrow. Especially PVC materials with large molecular weight are more difficult to process, so PVC materials with small molecular weight are usually used. The shrinkage rate of PVC is quite low, generally 0.2~0.6%. PVC plastic board has non-flammability, high strength, weather resistance and excellent geometric stability. Today, let's talk with you about the performance identification of pvc plastic board!

1. Performance identification of pvc plastic board

1. Identification of pvc plastic board performance-mechanical properties: PVC plastic board has higher hardness and mechanical properties. It increases with the increase of molecular weight, but decreases with the increase of temperature. The rigid PVC plastic board has good mechanical properties, and its elastic modulus can reach 1500-3000MPa. The elasticity of soft PVC is 1.5-15 MPa. But the elongation at break is as high as 200%-450%. The friction of PVC is general. The static friction factor is 0.4-0.5, and the dynamic friction factor is 0.23.

2. Performance identification of pvc plastic board-general performance: PVC resin is a white or light yellow powder with a relative density of 1.35-1.45. The hardness of the product can be adjusted by adding plasticizers. Pure PVC has very little water absorption and air permeability.

3. Identification of PVC plastic board performance-electrical properties: Flexible PVC board is a polymer with better electrical properties, but due to its greater polarity, the electrical insulation is not as good as PP board and PE plastic board. The dielectric constant, dielectric loss tangent and volume resistivity are relatively large, and the corona resistance is not good, and it is generally suitable for medium and low voltage and low frequency insulating materials.

4. Identification of the performance of pvc plastic board-thermal performance: the heat stability of PVC plastic board is very poor, it starts to decompose at 140℃, and the melting temperature is 160℃. The coefficient of linear expansion of PVC is small, it is flame retardant, and the oxidation index is as high as 45 or more.

5. Performance identification of pvc plastic board-environmental performance: PVC is resistant to most inorganic acids, alkalis, salts, and most organic solvents. Suitable for medicine and chemical anticorrosive materials.

Two, six secrets let you learn how to identify the performance of pvc plastic board:

1. Look at its appearance gloss: the poor gloss is recycled plastic, not PVC.

2. Resistance: the recycled plastic is also much worse.

3. Look at the cut surface: After the recycled plastic is cut, there will be miscellaneous materials with different colors.

4. Density: Throw it into the water to see if it floats on the water, most of the regenerated ones sink to the bottom.

5. Heating and welding: There will be smoke when welding recycled plastics.

6. Light transmittance: The light transmittance of PVC plastic board is excellent.