What are the requirements for HDPE sheets in manufacturing chemical equipment parts?

When manufacturing chemical equipment parts, the requirements for HDPE (high-density polyethylene) sheets are relatively high, mainly involving its chemical stability, mechanical properties, safety and processability. The following is a detailed description:

1. Chemical performance requirements
2. Strong corrosion resistance
   HDPE sheets must be resistant to a variety of acids, alkalis, salt solutions and organic solvents.
   No brittle cracking, softening or corrosion due to contact with chemicals.
3. Low water absorption
   The water absorption rate should be < 0.01% to avoid the material from swelling and deforming due to water absorption.
4. Mechanical and thermal performance requirements
5. Good rigidity and toughness
   The sheet should have high tensile strength and impact resistance to cope with pressure or impact during equipment operation.
6. Stable heat deformation temperature
   The melting point of HDPE is around 130°C, but the recommended working temperature is ≤ 80°C to ensure that it will not deform after long-term use.
   III. Surface and structural performance requirements
7. No pores or impurities
   The surface is flat and smooth, without bubbles, impurities or cracks, to prevent chemical media penetration or contamination.
8. High density and low internal stress of the board
   It is recommended to use compression molded HDPE board, which has uniform density and stable dimensions, suitable for welding and machining.
   IV. Processing performance requirements
9. Good thermal welding
   The board needs to be suitable for hot air welding, extrusion welding, butt welding and other welding methods to ensure the sealing of the components.
10. CNC processing, drilling and bending are possible
    Ensure that the parts can be processed in a complex manner or cut into special shapes.
    Examples of common application parts:
    Chemical liquid storage tanks, washing tower linings
    Pipeline systems, liquid distribution system components
    Corrosion-resistant fan impellers, shell plates
    Valve bodies, joints, sealing covers
    Shields, partitions, corrosion-resistant flange gaskets