Still have technical challenges in Aliphatic Iso foaming.
It's generally have lower reactivity, making foam control during the foaming process difficult.
The operating range or tolerance is narrow, making it challenging to produce compliant soft foam.
During foaming commen see foam collapse or localized collapse, coarse foam, surface powdering, and block foam shrinkage.
Need attention that used aliphatic ISO forming is not entirely immune to yellowing. Longtime over exposure to light, water, and heat, oxidation-induced yellowing may occur, though it's slower rate.
The Key Raw Materials and Additives:
- Polyols:
Polyether polyols such as Polyether 210, 220, 560s,
high-activity polyether polyols 4500-6000mw, and small-molecule polyols like ethylene glycol, propylene glycol, butylene glycol, DEG, and DPG.
- Isocyanates: Commonly used isocyanates include HDI, IPDI, and HMDI