Description: Series of SR 2100 UOR are silicone rubber compounds which arevulcanization moldingby adding curing agents. (The curing agents should be chosen according toprocess requirements.)
Special properties:
Ø Excellent physical strength of raw rubber.
Ø Barely structured in a long-term storage.
Ø Low compression set.
Ø Good thermal stability, up to 225℃
Ø Excellent resistance to oil (low swelling).
Ø Being able to be mixed with other rubbers.
Main applications:
Ø SR2100 UOR series can be used to manufacture mechanical rubber goodswhich require low compression set and good oil resistance. This series is suitablefor molding, injection, extrusion process.
Characteristics:
Type (according to GB/T5576-1997)................................MVQ
Naturalcolor......................................................................White
Curing Condition:
After addition of 1.2% of 2.5-dimethyl bis-(tertiobutyl peroxy) 2.5-hexane (50%) and vulcanization for 5 min. at 175°C, withpost curing at 200℃×4.
Mechanical properties：
Item | Test Method | Unit | Technical date |
SR2150UOR | SR2160UOR | SR2170UOR | SR2180UOR |
1 Mechanical properties，1.1after a single curing |
Density | ASTM D792 | g/cm3 | 1.19 | 1.25 | 1.32 | 1.37 |
Hardness （Shore A） | ASTM D2240 |
| 51 | 62 | 71 | 82 |
Tensile Strength | ASTM D412 | MPa | 7.8 | 7.5 | 8.2 | 8.5 |
Elongation | ASTM D412 | % | 350 | 300 | 220 | 160 |
Tear Strength (Crescent) | ASTM D 624 B | kN/m | 16 | 15 | 15.2 | 13.2 |
1 Mechanical properties，1.1after secondary curing |
Hardness （Shore A） | ASTM D2240 |
| 52 | 62 | 72 | 83 |
Tensile Strength | ASTM D412 | MPa | 7.7 | 7.5 | 8.3 | 8.6 |
Elongation | ASTM D412 | % | 320 | 280 | 190 | 150 |
Tear Strength (Crescent) | ASTM D 624 B | kN/m | 15 | 14 | 15.3 | 13 |
Compression Set (22hr/177℃) | ASTM D395 Method A | % | 10 | 10.9 | 8.2 | 7.9 |
1 Mechanical properties，1.3 Performance changes after 70 hours of aging at 225℃ |
Hardness （Shore A） | ASTM D2240 |
| 55 | 65 | 74 | 85 |
Tensile Strength | ASTM D412 | MPa | 7.1 | 6.5 | 6.4 | 6.84 |
Elongation | ASTM D412 | % | 310 | 235 | 150 | 130 |
2 Oil resistance：2.1 Performance changes after 70 hours of aging in ASTM 903 oil at 150℃ |
Hardness （Shore A） | ASTM D2240 |
| 36 | 48 | 56 | 69 |
Tensile Strength | ASTM D412 | MPa | 3.5 | 3.8 | 5.7 | 6.3 |
Elongation | ASTM D412 | % | 430 | 400 | 340 | 274 |
Volume change rate | ASTM D 471 | % | 37 | 35 | 36 | 34 |
2 Oil resistance：2.1 Performance changes after 70 hours of aging in ASTM 901 oil at 150℃ |
Hardness （Shore A） | ASTM D2240 |
| 49 | 60 | 69 | 80 |
Tensile Strength | ASTM D412 | MPa | 6.7 | 6.8 | 7.5 | 7.4 |
Elongation | ASTM D412 | % | 420 | 350 | 310 | 285 |
Volume Change Rate | ASTM D 471 | % | 5.4 | 5.2 | 3.4 | 2.3 |
