Stanley S421 All Purpose RTV Silicone Sealant — Acetoxy, Waterproof...
Description
Description
Stanley S421 All Purpose RTV Silicone Sealant — Acetoxy, Waterproof (10.1 fl oz)
Stanley S421 All Purpose RTV Silicone is a one-component, acetoxy-curing 100% silicone sealant that provides a permanently flexible, durable, watertight seal for general sealing and glazing. It bonds strongly to glass and non-porous surfaces — ceramic, porcelain, enamel, coated wood, stainless steel, and aluminum — stays elastic in low and high temperatures, and is antibacterial and mold-proof. Available in six colors, including the Translucent Clear finish.
| Property | Detail |
|---|---|
| Brand | Stanley |
| Model | S 421 All Purpose RTV Silicone |
| Curing Mechanism | Acetoxy (one-component) |
| Base | 100% silicone |
| Cartridge Size | 10.1 fl oz (300 mL) |
| Colors | White, Clear, Translucent Clear, Gray, Brown, Black |
| Skin-Formation Time | 8–20 min (73°F / 50% RH) |
| Drying Rate | Min. 0.1"/day |
| Shore A Hardness | 15–25 (ISO 868) |
| Elongation at Break | ≥350% (ISO 37) |
| Tensile Strength | ≥101 psi (ISO 8339) |
| Sagging | 0 in (ISO 7390) |
| Density | 8 ± 0.2 lb/gal (ISO 1183-1) |
| Service Temperature | −40°F to +356°F |
| Application Temperature | +41°F to +104°F |
| Shelf Life | 18 months |
| Standards | ISO 868, ISO 37, ISO 8339, ISO 7390, ISO 1183-1 |
- Acetoxy RTV cure — fast 8–20 min skin time
- Permanently elastic; resists aging, cracking, and discoloring
- Antibacterial and mold-proof
- Wide service range: −40°F to +356°F; elongation ≥350%
- Superior adhesion to glass and non-porous surfaces, indoor and outdoor
Sealing and glazing around windows, doors, and expansion joints on glass, porcelain, and steel; bathroom, kitchen, and plumbing applications; sealing electrical sockets and switches. Not paintable and not recommended for porous natural stone or mirrors.
Wear appropriate PPE. Follow manufacturer instructions and safety regulations.
