Plastic Square Cover Mould For Drain System

Chemical and physical properties of PVC material

Rigid (unplasticized) PVC is one of the most widely used plastic materials. It is produced from sodium chloride and natural gas. The repeat chemical structure is vinyl chloride. Additives are mixed with PVC to make them processible. PVC grades produced by suspension or mass polymerization techniques are the major types used for melt processing. PVC is substantially an amorphous material.

Some of the additives used include stabilizers, lubricants, processing aids, pigments, impact modifiers, and fillers. Some features of PVC include low combustibility, toughness (designed to be virtually unbreakable), good weather ability (including good color and impact retention, and no loss in stiffness), and excellent dimensional stability. PVC is highly resistant to oxidizing and reducing agents, and strong acids. However, unplasticized PVC is not recommended for environmental and continuous use above 60 C (140 F). It is not resistant to concentrated oxidizing acids such as sulfuric or nitric acid and is unsuitable for use with aromatic and chlorinated hydrocarbons.

It is very important to process the material at the correct melt temperature; otherwise, severe problems from decomposition (which produces hydrochloric acid which in turn accelerates decomposition) could result.

PVC is a relatively stiff flow material and has a narrow processing range. The molecular weight determines the flow characteristics. Higher molecular weight materials are more difficult to process (this could be modified by the addition of lubricants). Typically, however, relatively low molecular weight grades are used in molding).

Shrinkage is fairly low (0.002 - 0.006 mm/mm or 0.2 - 0.6%).

Properties of S136 mould steel

S136 mould steel material by electroslag melting smelting with good cast optical activity (mirror processing) good wear resistance and toughness at high temperature with good plasticity because of its high chromium content (13.6%) so its corrosion resistance is excellent, pre-add hard corrosion-resistant mirror mould steel S136 is a mirror rust-proof mold steel.

S136 mould steel with excellent corrosion resistance has been widely applied in the mold industry. However, in order to meet the increasing demands of injection products with complex structure and high quality, selective laser melting (SLM) as a novel manufacturing method is chosen due to its rapid fabricating parts with complex geometric shapes. Further, it is essential to enhance their hardness and wear property to prolong the service life of the injection mold.

Advantages of using S136 mould steel

S136 is plastic mould steel with excellent corrosion resistance and has excellent production characteristics. After long-term use of the mold, the surface of the cavity still maintains its original smooth state. When the mould is operated or stored in a humid environment, no special protection is required.

1. Pure & Precision mirror polishing

2. Competitive price in the Market

3. Highly quality of corrosion resistance

4. Convenient heat treatment for quenched & tempered steel, without deformed

5. Easy for welding