Commonly used internal model steel grade
Original number usage
8407 alloy die (quenching)
S 136H glass mold (or small tire mold)
S 136 nylon quenching die
2083H large tire mold
2083 big tire mold
23 16 tire mold
7 18H high-precision plastic mold
7 18S high-precision plastic mold
Universal plastic mould
738 is not commonly used
PPS plastic: It is a kind of thermoplastic special engineering plastic with excellent comprehensive properties, with outstanding characteristics of high temperature resistance, corrosion resistance and superior mechanical properties. English name: Phenylenesulfide Specific gravity: 1.36g/cm3 molding shrinkage: 0.7% Molding temperature: 300-330℃. It is a kind of thermoplastic special engineering plastic with excellent comprehensive properties, with outstanding characteristics of high temperature resistance, corrosion resistance and superior mechanical properties. PPS is a sulfur-containing aromatic polymer. Linear polyphenylene sulfide is crosslinked into thermosetting plastic above 350℃, and branched polyphenylene sulfide is thermoplastic plastic. PPS was first industrialized by American Phillips Company in 197 1 year. After the patent expired, Japanese companies began to develop and produce. A typical Japanese company is Toray, whose output at present is greater than that of the United States. Other manufacturers are mainly concentrated in the United States, Japan and Europe.