Description: This series is a premixed compound of silicone rubber with generalpurpose with good balanced properties for extrusion process, vulcanizing underheat after addition of a vulcanizing agent that could be chosen according toprocessing requirement.
Special properties:
Ø Good balanced mechanical properties for extrusion.
Ø Good appearance.
Ø Easy to process and demold, not sticky to rolls.
Ø Good stability up to 200℃.
Ø Slight replastification after prolonged storage.
Ø Wild range of reloading or blending.
Ø Bright colors easily obtained
Ø Vacuum-packed
Main applications:
Ø Extrusions such as seals, sheet, tube, etc.
Ø Molded articles, calendered sheet, etc.
Characteristics:
Type (according to GB/T5576-1997)................................VMQ
Naturalcolor...................................................................... translucent
Curing Condition:
After addition of 1.1% of 2,5-dimethyl-2-5-di(tert-butylperoxy)hexane (at 45%) and vulcanization for 10 min at 170°C.
Mechanical properties
Item | Testing Method | Unit | Technical Data |
SR230U | SR240U | SR250U | SR260U | SR270U | SR280U |
Appearance | Visual Observation |
| Translucent | Translucent | Translucent | Translucent | Translucent | Translucent |
Density | ASTM D792 | g/cm3 | 1.09 | 1.13 | 1.17 | 1.19 | 1.21 | 1.23 |
Hardness | ASTM D2240 | Shore A | 31 | 41 | 50 | 59 | 69 | 79 |
Tensile Strength | ASTM D412 | Mpa | 7.1 | 8.1 | 9.0 | 9.2 | 8.6 | 7.7 |
Elongation | ASTM D412 | % | 690 | 587 | 390 | 332 | 238 | 186 |
100% Modulus | ASTM D412 | Mpa | 0.59 | 0.81 | 1.39 | 1.99 | 3.35 | 3.52 |
Tear Strength | ASTM D624 Die B | N/mm | 12 | 14 | 17 | 16 | 18 | 16 |
Rebound | ASTM D395 Method B | % | 73.9 | 70.3 | 68.5 | 59.9 | 56.5 | 52 |
