SVR , STR

  • introduction:
    The inconsistency between the appearance and internal properties of raw rubber is very inconvenient for consumers, so TC rubber (technical classification rubber) came out. At present, according to the standards of each production country, there are mainly STR (Thailand), SMR (Malaysia), SVR (Vietnam), SIR (Indonesia)
  • Classification:
    The classification of standard rubber is mainly divided by the impurities contained in it. The technical specifications are as follows

    Name SVR 3L SVR 10 SVR 20
    1. Impurities (%, maximum) 0.03 0.10 0.20
    2. Volatile matter (%, maximum) 1.0 1.0 1.0
    3. Ash content (%, maximum) 0.60 0.75 1.00
    4. Nitrogen (%, maximum) 0.65 0.65 0.65
    5. Plasticity index, PRI (minimum) 60 50 40
    6. colour 6 max – –
    7. Mooney viscosity (1+4′)100° C – – –
  • Origin:
    Thailand- STR 5L, STR 10, STR 20
    Vietnam- SVR 3L, SVR 10, SVR 20
    Malaysia- SMR 5L, SMR 10, SMR 20
    Indonesia- SIR 20

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