XH‑1880 Silicone Foam Stabilizer for OCF (One‑Component Foam) Applications

Introduction

OCF stands for One‑Component Foam, the aerosol‑packaged moisture‑curing polyurethane foam sealant. OCF‑grade silicone foam stabilizer adopts Si‑C bond non‑hydrolyzable polysiloxane structure. Ordinary Si‑O‑C hydrolyzable rigid‑foam silicone surfactants must not be used for OCF; they will hydrolyge inside aerosol cans during long‑term storage, resulting in poor foaming performance.

Core Functions

1. Emulsify prepolymer together with DME / propane‑butane blowing agents for stable system compatibility and qualified shelf‑life inside aerosol cans.
2. Deliver fine, uniform cell structure and reduce hidden voids, cavities and oversized pores.
3. Regulate open‑/closed‑cell ratio to eliminate post‑foaming shrinkage, collapse and poor resilience.
4. Optimize foam flow and expansion ratio, improving low‑temperature (winter) construction performance.
5. Boost foam‑to‑substrate adhesion and minimize interfacial gaps.

Open‑cell vs Closed‑cell Silicone for OCF

Most commercial OCF formulations mainly deploy open‑cell silicone, with small portions of closed‑cell silicone blended to balance hardness and shrinkage.

Topwin’s XH‑1880 is a proven mainstream open‑cell foam stabilizer with key application properties:

• Compatible with propane‑butane blowing agent systems
• Superior emulsifying capacity
• Fine and homogeneous foam cells
• High foam‑stabilizing performance to reduce void defects
• High open‑cell rate and reliable dimensional stability

Storage & Precautions

• Store in cool, sealed conditions; keep away from water. Strictly control moisture content of raw materials.
• Do not mix with conventional hydrolyzable rigid‑foam silicone surfactants in OCF formulas.

Application Fields of OCF Foam

1. Construction sealing: Filling, sealing, bonding and fixing for door & window frames; masonry sealing, cable box fitting, air‑condition & plumbing insulation, tile bonding, home renovation and external insulation board installation.
2. Packaging & logistics: Protective wrapping for high‑value and fragile goods.
3. Railway transport: Gap filling & leak‑stopping to prevent solid cargo leakage from freight wagons.