PVC board is a kind of polymer with good electrical performance, but its electrical insulation is not as good as PP and PE due to its high resistance. Dielectric constant, tangent of dielectric loss angle, large volume resistivity, poor corona resistance, generally suitable for medium and low voltage low-frequency insulating materials. These characteristics make it self extinguishing. Let's have a look.
The thermal stability of PVC board is very poor. It begins to decompose at 140 ℃ and the melting temperature is 160 ℃. PVC has low linear expansion coefficient, flame retardant and oxidation index above 45.
Mechanical properties: PVC board has high hardness and mechanical properties. It increases with the increase of molecular weight, but decreases with the increase of temperature. UPVC has good mechanical properties, and its elastic modulus can reach 1500-3000 MPa. The elasticity of flexible PVC is 1.5-15 MPa But the elongation at break is as high as 200%-450%. PVC has average friction, static friction coefficient is 0.4-0.5, and dynamic friction coefficient is 0.23.
Environmental performance: PVC board can resist most inorganic acids, alkalis, salts and most organic solvents. It is suitable for anticorrosive materials in pharmaceutical and chemical industries.
Forming characteristics 1 Amorphous material with low hygroscopicity and poor fluidity. In order to improve the fluidity and prevent bubbles, the plastic can be dried in advance. The mold pouring system shall be thick and short. Attention shall be paid to the bag type dust removal accessories. The gate section shall be large without dead corners. The mold shall be cooled and the surface shall be chrome plated.
2. due to its perishability and fluidity, it is better to use special equipment and molds. All products must be added with different types and quantities of additives as required.
3. it is very easy to distinguish. It is easier to distinguish when it is in contact with steel and copper at 200 ℃, and there is decay and irritant gas escaping in the process of distinguishing. The forming temperature range is small.
The above is the content of today. PVC board has excellent mechanical and electrical properties, strong acid and alkali resistance, good chemical stability, but low softening point. It is suitable for making thin plates, insulation layers of wires and cables, seals, etc. If you have any other questions, please contact us.