Q&A - Storage and Handling of Polyurethane Resin Components. ________________________________________
Q: What are the differences between Part-A and Part-B components?
• Part-A (Prepolymer) contains isocyanate, which is very sensitive to moisture. • Part-B (Polyol blend) is hygroscopic, meaning it absorbs moisture from the air.
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Q: How should I store Part-A (isocyanate)?
• Store between 72–86°F all the time.
• Keep dry and away from water sources.
• After opening, purge the container with nitrogen gas or argon gas to prevent moisture contact.
• For drums, install a desiccant filter (silica gel or calcium chloride) on the vent.
• If frozen, thaw immediately to 140°F to avoid irreversible side reactions.
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Q: What happens if Part-A reacts with moisture?
• It reacts irreversibly, ruining the material.
• Large-scale contact with water can create dangerous heat and CO₂ gas buildup.
• Thermal decomposition (by fire or extreme heat) produces toxic gases.
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Q: What should I do if I find a leak in a Part-A drum?
1. Rotate the drum so the leak is at the highest point to minimize further leaking.
2. Cover the leak with a dry towel to block air/moisture.
3. If possible, transfer to a new container with nitrogen purge.
4. If pressure buildup is suspected, slowly open the cap to release gas before moving the drum.
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Q: How should I store Part-B (polyol)?
• Keep in airtight containers.
• Store at 72–86°F in a dry indoor space.
• Avoid long exposure to open air to prevent moisture absorption.
• Nitrogen purge is helpful, but usually not essential if the container is sealed properly. If the work place moisture is above 55% at room temperature, nitrogen purge is highly recommended.
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Q: What general safety precautions should be taken when handling these materials?
• Read and follow the Safety Data Sheets (SDS) provided with each shipment.
• Restrict access to authorized personnel only.
• Wear: o Rubber gloves o Long sleeves o Eye protection
• Ensure good ventilation—especially when heating or spraying.
o Use hoods or exhaust systems if needed.
o Use an appropriate respirator (e.g., full-face with HEPA/organic vapor filters) if exposure limits may be exceeded.
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Q: Are polyurethane raw materials health-hazardous?
• Yes. Skin and eye contact, inhalation, or ingestion can lead to health issues.
• No eating, drinking, or smoking in the work area.
• Wash thoroughly after handling.
• Follow standard industrial hygiene practices.
Reach out Northstar Polymers for more information. info@northstarpolymers.com
