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Product Description | Technical Specified Rubber (TSR) which is also known as block rubber is graded according to precise technical parameters such as dirt content, ash content, nitrogen content, volatile matter and properties of the rubber such as its Wallace Plasticity (PO) and its Plasticity Retention Index (PRI) TSRs are widely graded (by the aforementioned technical parameters) and named differently in different countries. For example, in Vietnam, TSRs are divided into 10 grades (Lov, CV60, CV50, L, 3L, 5, 10CV, 10, 20CV, and 20), with descending order of rubber quality and named Standard Vietnam Rubber (SVR). In other countries, TSRs could go by many names including SIR, SMR and STR with different sets of technical parameters. Please be noticed that SIR 3L from Indonesia is technically different from SVR 3L from Vietnam, despite their partial similarity in the naming scheme. TSR 3L or SVR 3L could be considered a balanced trade-off between quality and cost, compared to TSR-L (or SVR L in Vietnam). Therefore, SVR 3L is widely used in rubber bands, tapes, adhesive solutions, textiles, surgical, pharmaceutical products, industrial rollers for the paper printing industry, bicycle tubes, chewing gum, and gaskets |
Place of Origin | Vietnam |
Ho Chi Minh City | |
Brand Name | Blue Diamond Rubber |
Model Number | TSR/SVR 3L-20KG-TCPW-SW-WP |
Color | yellow light brown |
Material | 100% natural rubber |
Content of impurities/dirt remaining on the sieve, % by mass, no greater than | 0.03 |
Content of ash, % by mass, no greater than | 0.50 |
Content of nitrogen, % by mass, no greater than | 0.60 |
Content of volatile matter, % by mass, no greater than (or to be negotiated between parties) | 0.80 |
Initial plasticity (Po), no greater than | 35 |
Plasticity retention index (PRI), no less than | 60 |
Lovibond color index, individually sampled, no more than | 6 |
Mooney ML viscosity (1’ + 4’) at 100 degree Celsius (or to be negotiated between parties) | NONE |
Content of gel, % by mass, no greater than | NONE |
Bale's marking | Grade of the rubber, net mass of the bale, Name of producer/estate or trade-mark (customizable or on demand) |
Weight | 20kg per bale |
Packing | 0.10mm (+/- 0.01mm) thick polyethylene plastic bag, as well as 0.2mm contractive plastic bags (shrink wrap) covering all the bales and loaded onto Borate-treated wooden pallet |
Pallet | made of borate-treated wood to carry bales |
Quality Standards | ISO 9001:2015, ISO 249, ISO 247, ISO 1656, ISO 248, ISO 2007, ISO 2930, ISO 4660, ISO 289-1, ISO 17278 |







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