HEAT CURED SILICONE RUBBER IOTA HCR 160 U

Description：IOTA HCR 160 U is a silicone master-batch, vulcanizing under heat after addition of a vulcanizing agent (chosen according to the transformation procedure).

Applications：

General purpose extrusion material: profiles, gasket and tubing.

Compression and injection moulding to manufacture high transparent or bright colored parts featuring good mechanical properties.

Special properties：

No milling or quick milling after long storage

Easy processing in milling, extrusion and moulding

No post-cure or slight post-cure

High transparency

Good heat stability, up to 200℃

High level of filler acceptance

Bright colors easily obtained with Bluestar Silicones SC color bases

Good mechanical and electrical properties

Blendable with other master-batches and additives.

Characteristics：

Type(in accordance with GB/T 5576/1997) ………………………………………… VMQ

Density at 25℃, g/cm³, approx………………………………………………………… 1.14

Natural color…………………………………………………………………… Transparent

Properties after working:

(1) After addition of 1.25% 2,4-dichloro-benzoyl peroxide (at 50%), and vulcanization for 8min at 115℃

(2) After addition of 1.0% 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane at 45%, and vulcanization for 10 minutes at 170℃

1. Mechanical properties

1.1 Properties without post-cure                                 (1)        (2)

Shore A hardness, approx……………………………….       59         56

Tensile strength, MPa, approx………………………………    9.7        11.2

Elongation at break, %, approx……………………………    400        520

Modulus at 100% elongatioin, MPa, approx ………………  2.0        1.5

Tear strength, kN/m, approx…………………………………   21         24

Compression set (22h/177°C/25%), %, approx. …………    44         35

Rebound resilience, %, approx…………………………………  54         46

1.2 Properties after post-cure for 4 hours at 200℃    

Shore A hardness, approx…………………………………….    62        61

Tensile strength, MPa, approx…………………………………   11        11.5

Elongation at break, %, approx……………………………     385       445

Modulus at 100% elongatioin, MPa, approx ……………     2.2        1.9

Tear strength, kN/m, approx…………………………………     21        23

Compression set (22h/177℃/25%), %, approx……………     35        21

Rebound resilience, %, approx…………………………………    53      50

2. Heat stability

2.1 Properties after ageing 7 days at 177°C

Shore A hardness, approx……………………………………      65       65

Tensile strength, MPa, approx…………………………………    10.7      11

Elongation at break, %, approx…………………………………   350      380

Modulus at 100% elongation, MPa, approx…………………    2.5     2.3

Tear strength, kN/m, approx……………………………………    19     19

Rebound resilience, %, approx…………………………………    55     52

2.2 Properties after ageing 7 days at 200°C

Shore A hardness, approx……………………………………       65     70

Tensile strength, MPa, approx…………………………………     9.6     8.5

Elongation at break, %, approx…………………………………   305     240

Modulus at 100% elongation, MPa, approx……………………   2.9    3.4

Tear strength, kN/m, approx……………………………………    14     13

Rebound resilience, %, approx…………………………………    55     54

2.3 Properties after ageing 10 days at 200°C

Shore A hardness, approx……………………………………      68     71

Tensile strength, MPa, approx…………………………………     9.2     7.8

Elongation at break, %, approx…………………………………   240     210

Modulus at 100% elongation, MPa, approx……………………   3.6     3.7

Tear strength, kN/m, approx……………………………………    10     10

Rebound resilience, %, approx…………………………………    57     57

3.  Electrical properties

Dielectric strength (on 1 mm thick slabs), kV/mm, approx………    29     32

Dielectric strength (on 2 mm thick slabs), kV/mm, approx………    21     21

Dielectric constant at 1 MHz, approx…………………………………   2.5    3.1

Dielectric factor at 1 MHz, approx……………………………  3.4×10^-3    3.4×10^-3

Volume resistivity, Ohm.cm, approx…………………………  2.6×10¹⁵   3.2×10¹⁵

Packaging: IOTA HCR 160U is delivered in 20 kg carton boxes.

Storage and shelf life: IOTA HCR 160U may be stored in its original unopened packaging at a temperature below 40℃ for up to 18 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.