4050A/B Polyurethane casting s
Ⅰ、Brief instruction
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4050A/B is two-component PU casting system, it has excellent low temperature properties, good electric properties, water resistance and low water absorption。 |
Ⅱ、Product data：
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Item |
Unit or condition |
4050A/B |
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Appearence |
A |
Visual |
Light yellow liquid |
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B |
Pale yellow transparent liquid Light |
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Viscosity |
A |
25℃ mPa·s |
350±50 |
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B |
110±10 |
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A+B |
200±50 |
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Density |
A |
25℃ g/cm3 |
1.15±0.05 |
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B |
0.95±0.05 |
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Pot life |
25℃ min |
20~40 (to10000mPa·s) |
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Mixing proportion |
Weight proportion |
A ：B=75±2 ：100 |
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Curing schedule |
℃/h |
60℃/3h or 25℃/24h |
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Shelf life |
R.T.Sealed |
6 months |
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Ⅲ、Properties of cured system：
|
Item |
Unit or condition |
4050A/B |
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Hardness |
Shore-A |
30±5 |
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Volume resistivity |
25℃，Ω·cm |
>1013 |
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Water absorption |
24hrs, 25℃，% |
<0.3 |
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Insulation strength |
25℃，kV/mm |
>20 |
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Tear elongation |
% |
>150 |
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Combustibility |
UL94 V-2 |
equivalent |
Ⅳ、Application：
Used for casting of electric units such as electrical portfire controller、IC board etc.
Ⅴ、Work method：
1．Porheating：The units proheat at 70~80℃ for 1~2h to remove humidity；
2．Mixing：Weight A and B by mix ratio and mix throughly；
3．Degassing：Degas the mixture by vacuum；
4．Casting：Cast the degassed mixture into the preheated units。
Ⅵ、Points to note
〔Control and Protective measures〕
Protective clothing needed
Protective gloves must
Raglan sleeves needed when skin contact exist
Goggles needed
Gas mask/Dust proof cover not needed
〔Skin protection〕
Before applying use ointment on naked skin
After applying use protect oil or nutrient oil
Cleaning of contacted skin wipe the material from skin with absorbent paper then wash with warm water and alkali-free soap ,do not use solvent.
〔Workplace cleaning〕
Cover the worktable with light colour paper, use one-off beaker。
〔Accidental release measures〕
Soak up with waste cotton or saw dust and deposit in plastic-lined bin
〔Ventilating measures〕
Workshop Ventilate often
Workaround Equipped with ventilator ,avoid breathing in the vapor
Ⅶ、Packaging：
Component A: 20 Kg Metal container Component B: 18 Kg Container ;