Usage and application information
of 1 million Dimethicone and 60000 Dimethicone cross polymer
1. Dimethicone (1 Million Molecular Weight)
Properties:
- High viscosity (400k–1M MW), colorless solid, volatiles ≤2%.
- Temperature resistance (−60°C ~ 200°C), excellent chemical/weather stability.
Applications:
- Construction: Sealing joints in concrete structures (bridges, tunnels).
- Electronics: Insulation/anti-shock coating for components.
- Molding: Release agent for rubber products.
Usage Guidelines:
- Formulation: 100 parts silicone + crosslinker (ethyl silicate) 1–10 parts + catalyst (dibutyltin dilaurate) 0.5–5 parts.
- Processing: Apply within 1–2 hours; clean substrates with acetone.
- Curing: 2–4 hours tack-free, full cure in 3–7 days.
2. Dimethicone Crosspolymer (60,000 cSt)
Properties:
- Linear non-reactive silicone, viscosity 60,000 mm²/s, low surface tension (21.4 mN/m).
- Safety limits: ≤25% in leave-on, ≤5% in rinse-off cosmetics.
Applications:
- Cosmetics
- Skincare: Emollient (1–10%)
- Sunscreen: Water resistance (5–15%)
- Haircare: Conditioning agent (1–2%)
-
Advanced Materials:
- Dielectric layers for sensors/artificial muscles
- Gas-selective membranes (thickness: 20–500 µm)
Usage Guidelines:
- Store <40°C, shelf life 36 months.
- Avoid moisture to prevent premature curing.
Comparative Analysis
Critical Comparison Table
-
Parameter 1,000,000 cSt Dimethicone (Linear) 60,000 cSt Dimethicone Crosspolymer (Elastic) Chemical Structure Linear Polymer Chain 3D Crosslinked Network Texture & Feel Heavy, Occlusive, Glossy Lightweight, Velvety, Non-Greasy Primary Function Barrier Formation, Waterproofing, Release Agent Film Flexibility, Sensory Enhancement, Stabilization Prime Applications Scar creams, waterproofing, heavy hair oils, industrial defoamers Long-wear foundations, W/O emulsions, transfer-resistant lipsticks, hair gels Max Safe Level No fixed limit ≤25% (leave-on), ≤5% (rinse-off) per CIR Key Blending Partners Volatile Silicones (e.g., Cyclopentasiloxane) Other silicones, esters
Stability and Formulation Guidelines
-
- pH Sensitivity: Dimethicone Crosspolymers may hydrolyze (break down) in high-pH environments above pH 8. Formulators should avoid very alkaline formulations.
- Thermal Stability: Linear Dimethicone is stable up to ~200°C before it begins to degrade. This makes it suitable for high-temperature industrial processes.
Summary of Applications & Usage Rates
-
Silicone Type Industry Function Usage Rate Key Examples 1M cSt Linear Cosmetics Occlusive Barrier 0.5–3% Scar-reduction creams Hair Care Frizz Control, Shine 1–5% Intensive hair masks Industrial Release Agent/Defoamer 0.1–0.5%* Tire molding 60K cSt Crosspolymer Skincare W/O Emulsion Stabilizer ≤25% (leave-on) Long-wear foundations Hair Styling Flexible Hold 3–8% Alcohol-free hair gels Color Cosmetics Pigment Dispersion 2–4% Transfer-resistant lipsticks