Silicone Sealant Base Polymer (α,ω-Dihydroxy Polydimethylsiloxane)
α,ω-Dihydroxy polydimethylsiloxane (PDMS) is the primary base polymer for room-temperature-vulcanizing (RTV) silicone sealants, offering a unique combination of flexibility, thermal stability (−60 °C to +200 °C), and UV resistance. It crosslinks with silane crosslinkers in the presence of moisture and tin or titanium catalysts to give durable, elastic seals. The polymer backbone is chemically inert, water-repellent, and resistant to ozone and UV degradation.
Teknik Özellikler
| viscosity | 20,000–100,000 mPa·s (25 °C, grade dependent) |
| volatiles | ≤1.0% |
| appearance | Colorless transparent viscous liquid |
| hydroxylContent | 0.03–0.10% |
| specificGravity | 0.97–0.98 |
Uygulama Alanları
- Construction weatherproofing and glazing sealants
- Automotive and aerospace sealing
- Electronics and electrical sealing compounds
- Sanitary (mold-resistant) sealants
- Industrial maintenance sealants
Ürün Özellikleri
- Exceptional temperature range (−60 °C to +200 °C)
- Outstanding UV and ozone resistance
- Inherently water-repellent and flexible
- Compatible with RTV-1 and RTV-2 sealant formulations