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Certification:ROHS
SH 502 U A/B Flame Retardant Custom Silicone Rubber Parts with UL 94-V0
Flame retardant silicone rubber productswith the properties of good flexibility and anti-compression deformation, heat, pressure, abrasion, impact resistance, tensile strength, tear resistance, flame, shock absorption, cold, anti-aging.In line with ROHS standard, halogen-free , fire-retardant to UL 94-V0.
The flame retardant feature of this tock suggests its use for any molded parts of the electric, automotive, vessel and aircraft areas.
Dow Corning SH 502 U A/B
Dow Corning Toray Silicone SH 502 U A/B Stockis a high performance flame retardant silicone rubber stock which is recognized as UL 94 V-0.
The part, which requires flame retardancy as well as extreme high and low temperature resistances such as the parts of television set, will be produced by using Dow Corning Toray Silicone SH 502 U A/B Silicone Rubber.
1.1.1 CHARACTREISTICS* Flame Retardancy : UL 94 V-0 recognition
* Molding Characteristics : Any complicated parts are easily molded
* Electrical Properties : Good insulating characteristics are provided
1.1.2 USESThe flame retardant feature of this tock suggests its use for any molded parts of the electric, automotive, vessel and aircraft areas.
1.1.3 TYPICAL PROPERTIESTable 1 shows typical properties of SH 502 U A/B. These values are not intended for use in preparing specifications.
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Table 1. TYPICAL PROPERTIES OF SH 502 U A/B |
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Property Property |
|
Plasticity, Williams 250 Tear Strength, kgf/cm(JIS-B) 23 |
|
Specific Gravity at 25℃ 1.37 Linear Shrinkage, % 2.8 |
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Durometer Hardness, ShA 53 Dielectric Strength, KV/mm 28 |
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Tensile Strength, kg/cm2 74 Volume Resistivity, ohm-cm 5´1015 |
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Elongation, % 530 Dielectric Constant 2.92 |
|
Dissipation Factor 0.004 |
Recommended Curing Condition
Mixing Ratio SH 502 U A/B 100 phr
RC-4 50p 0.5 phr
Press Cure 170℃/10 mins
Oven Cure 200℃/4 hours ( Post cure)
Heat Resistance Changes of physical properties after heat aging are shown in Table 3.
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Table 3. TEST RESULT OF HEAT AGING |
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Property |
200℃, 72 hours |
250℃, 72 hours |
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Hardness, points change |
+ 4 |
+ 5 |
|
Tensile Strength, percent change |
- 4 |
- 14 |
|
Elongation, percent change |
- 18 |
- 53 |
Resistance To Hot Oils: Physical property change after oil immersion, shown in Table 4.
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Table 4. TEST RESULT OF Oil Resistance |
||
|
Property |
ASTM No.1 oil 150℃, 72 hours |
ASTM No.3 oil 150℃, 72 hours |
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Hardness, points change |
- 3 |
- 26 |
|
Tensile Strength, percent change |
- 12 |
- 70 |
|
Elongation, percent change |
- 8 |
- 44 |
|
Volume Change, % |
+ 5.3 |
+ 45 |
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