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First CaO-80
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- Chemical composition: Calcium oxide
- Complex carrier: EPDM/EVM
- Characteristics: Applied to both natural and synthetic rubber; effectively absorbs moisture within the compound, eliminating surface defects caused by water; enhances bubble uniformity in foamed products, significantly reducing defect rates; suitable for use in atmospheric continuous vulcanization systems, such as salt bath, microwave, or hot-air curing processes.
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- Product Description
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Pain point you may have faced
Your continuous vulcanization line – whether salt bath, microwave, or hot air – produces rubber profiles with pinholes, blisters, or rough surfaces. The problem is worse on humid days or when your raw materials contain trace moisture. In foamed products, bubbles are uneven – some too large, some too small – leading to high reject rates. You have tried drying fillers or adding cheap desiccants, but they don't disperse well and sometimes cause scorch.Why CaO‑80GE is different
First® CaO‑80GE is a highly effective moisture absorber and defoaming agent for both natural and synthetic rubber. It chemically binds free water inside the compound, eliminating surface defectscaused by water vapor expansion during vulcanization. Because it is pre‑dispersed in an EPDM carrier, it mixes rapidly and uniformly – no dust, no agglomerates.What you gain
For profiles & hoses – smooth, pinhole‑free surfaces, even in high‑humidity conditions.
For foamed products – significantly improved bubble uniformity, dramatically reducing defect rates.
For continuous vulcanization – works perfectly in salt bath, microwave, and hot‑air CV lines without interfering with cure speed.
Real‑world result
An EPDM sponge weatherstrip manufacturer had 15% scrap due to uneven cells and surface blisters. After adding First® CaO‑80GE at 3 phr, bubble uniformity improved so much that reject rates dropped to 4%. The same extrusion line could run faster because they no longer needed to slow down to let moisture escape. They also noticed cleaner salt bath equipment with less residue.Typical specifications
Appearance: off‑white to light gray granules
Active ingredient: calcium oxide (approx. 80%), coated to prevent pre‑hydration
Carrier: EPDM/EVM
Recommended dosage: 2–5 phr (adjust for moisture level of your fillers)
Packaging: 25 kg carton with inner PE liner
Storage: 6 months in unopened packaging, cool and dry (protect from air exposure)
Samples and technical data sheets are available. No hard selling — just for your evaluation.
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