HEAT CURED SILICONE RUBBER IOTA HCR 2950 U
Description: IOTA HCR 2950 U is a silicone master-batch, heat curing after the
addition of a vulcanizing agent (chosen according to the processing method).
Applications: IOTA HCR 2950U is
recommended for buttons,
O-rings, gaskets, seals, rubber rollers and other requirements of high
resilience and low compression set of products.
Special properties:
High resilience,
low compression set;
Good appearance,anti-yellowing;
Good mechanical properties;
Easy processing, non-stick rollers,
easy release;
Not easy to structured after long-term storage;
Good thermal stability;
Wide possibilities for blending with
other master batch.
Characteristics:
Type (in accordance with GB/T 5576-1997)
…………………………………… VMQ
Density at 25°C, g/cm3, approx……………………………………………………
1.13
Natural color………………………………………………………………………
translucent
Properties after working:
After addition of 1.1%
2,5-dimethyl-2,5-di(tert-butylperoxy)hexane (at 45%), and vulcanization for 5
minutes at 175℃
1.Mechanical
property:
1.1
Without post-cure
Shore A hardness, approx………………………………………………………48
Tensile strength, MPa, approx…………………………………………………
8.4
Elongation at break, %, approx………………………………………………. 418
Modulus at 100% elongation, MPa, approx………………………………. 1.24
Tear strength, (ASTM D 624 Die B) kN/m, approx…………………………. 15
Rebound resilience, %, approx………………………………………………… 67
Linear shrinkage, %, approx……………………………………………………
3.10
1.2 Properties after post-cure for 4 hours at 200°C
Shore A hardness, approx…………………………………………………… 49
Tensile strength, MPa, approx……………………………………………….. 8.2
Elongation at break, %, approx…………………………………………… 375
Modulus at 100% elongation, MPa, approx…………………………… 1.34
Tear strength (ASTM D 624 Die B)，kN/m, approx……………………… 14
Compression set , (22 h/177℃/25%) %, approx………………………… 13
Rebound resilience, %, approx…………………………………………… 66
Linear shrinkage, %, approx……………………………………………… 3.51
2.
Thermal stability
Properties after post-cure for 3 days at 225°C
Shore A hardness, approx…………………………………………………
44
Tensile strength, MPa, approx…………………………………………..
6.7
Elongation at break, %, approx…………………………………………
346
Packaging: IOTA HCR 2950 U is delivered in 20 kg carton boxes.
Storage and shelf life: IOTA HCR 2950 U may be stored in its
original unopened packaging at a temperature below 40°C for up to 6 months from the date of manufacture
marked clearly on the packaging.
Past this date, IOTA no longer guarantees that the product meets the sales specifications.
