... , OEM orders 3, Quick delivery 4, strict quality control Partname: 45 Degrees O-Rings Mould1. Mould for all kinds of rubber ... .2. Cavity number: Single, multi-cavity3. Cavity/core steel: P20, 45#, Cr12MOV etc.4. Products Material: NBR, FPM, CR, EPDM, ACM ... adopted the integral quenching which can control the mould's hardness within HRC50± 3 degree, it ensure that the service life ...