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STEP |
DO |
DON'T |
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| Receiving Polyurethane Products. |
- Check containers for proper labels.
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- Accept without inspection
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- Check containers for damage.
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- Accept damaged goods
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- Check for correct product number and container weight.
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| Storing Polyurethanes |
- Protect against excessive heat.
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- Expose to moisture.
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- Protect against moisture exposure.
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- Expose to heat.
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| Degassing (air removal) |
- Degas Part A and Part B separately.
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- Try and get by without degassing.
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- Degas after mixing Part A and Part B together.
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- Over degas Part A.
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Control degassing pressure to:
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<5mm
for Part B |
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<20mm for Part A |
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| Back to Top |
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| Resin/Curative Transfer |
- Use closed system and vacuum transfer if possible.
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- Pressurize drums or containers.
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- Provide local ventilation to remove fumes.
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- Breathe fumes from isocyanates.
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- Blanket containers with dry gas such as Nitrogen.
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- Leave containers open to the air or moisture.
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- Use gloves and do not get on hands.
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- Use bare hands.
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- Use respirator.
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- Breathe fumes in ambient air.
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- Observe manufacturers safety data (MSDS)
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| Metering Polyurethane Products. |
- Check calculations
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- Weigh without calculating.
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- Use metal containers for checking material.
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- Approximate.
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- Use an electronic weigh scale.
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- Use paper cups.
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- Always record the weight of Part A and Part B used in the mix.
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| Back to Top |
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| Mixing the urethane components |
- Check material temperatures before starting.
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- Mix quickly and thoroughly minimizing air entrapment.
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- Beat air into the mix while mixing.
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- Scrape the sides and bottom of mixing container.
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- Use wooden sticks to mix with.
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- Do not breathe fumes. Provide local ventilation to
remove fumes.
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- Breathe fumes.
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- Wear safety glasses
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- Clean tools in solvent after use.
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| Back to Top |
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| Pouring and Casting with Urethanes. |
- Check Tool Temperature
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- Use incorrect tool temperature.
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- Pour evenly and avoid splashing.
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- Dump into the mould to minimize time.
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- Pour from one area and let the material flow out pushing air ahead of
it.
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- Pour from various locations or all over the place.
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- Allow material to set according to the manufacturers recommendation.
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- Move moulds too quickly.
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| Curing and Post curing Urethanes. |
- Follow the de-mould temperature and time.
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- Run tooling too hot or too cold.
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- Check for uniform firmness before removing the part.
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- Use excessively high temperature.
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