Hybrid adjustment type chloroprene rubber CR321, CR322 (1)

1 Scope

This standard specifies the technical requirements, inspection methods, inspection rules, packaging, marking, storage, and transportation of CR3211, CR3212, CR3213, CR3221, CR3222, CR3223 in the CR321 series of mixed-regulated chloroprene rubber

This standard applies to CR3211, CR3212, CR3213, CR3221, CR3222, CR3223 prepared by emulsion polymerization with chloroprene as monomer, sulfur and regulator D as regulator

2 Normative references

The clauses in the following documents have become clauses of this standard after being quoted in this standard

GB/T528-1998 Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber (eqvISO37: 1994)

GB/T1232.

GB/T1233-2008 Determination of the initial vulcanization characteristics of unvulcanized rubber is measured with a disc shear viscometer (ISO289-2: 1994, MOD)

GB/T4498-1997 Determination of rubber ash (eqvISO247: 1990)

GB/T15340-1994 Natural and synthetic raw rubber sampling and sample preparation method (idtISO1795: 1992)

GB/T19187-2003 Synthetic raw rubber sampling inspection procedure

GB/T21162-2008 chloroprene rubber (CR) evaluation method

HG/T3928-2007 industrial active light magnesium oxide

3 Technical requirements

3.

Beige or light brown flakes and lumps, free of mechanical impurities other than talc, and no scorched particles (visual inspection)

3.

The technical indicators of CR3211, CR3212, CR3213, CR3221, CR3222, CR3223 are shown in Table 1

Table 1 Technical indicators of CR3211, CR3212, CR3213, CR3221, CR3222, CR3223