CARBINOL (HYDROXYL) TERMINATED POLYDIMETHYLSILOXANE

Carbinol (Hydroxyl) Terminated Polydimethylsiloxane (PDMS)

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1. Basic Information

Chemical Name: α,ω-Bis(hydroxyalkyl)-terminated polydimethylsiloxaneSynonyms:Hydroxy-terminated PDMSPDMS-diolSilicone polyolCAS Number: Varies by molecular weight (e.g., 70131-67-8 for typical grades)Molecular Formula: HO-[Si(CH₃)₂O]ₙ-HAppearance: Colorless to pale yellow viscous liquidOdor: Odorless or slight silicone-like odor

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2. Physical and Chemical Properties

Property	Typical Value Range
Molecular Weight	500–100,000 g/mol (customizable)
Viscosity	50–100,000 cSt (25°C)
Density	0.97–1.02 g/cm³ (25°C)
Hydroxyl Value	1–100 mg KOH/g (depends on MW)
Flash Point	>200°C (392°F)
Solubility	– Soluble in hydrocarbons, ethers
	– Insoluble in water, methanol

3. Hazards (GHS Classification)

Skin Irritation: May cause mild irritation (H315)Eye Irritation: Causes mild eye irritation (H319)Environmental: Not classified (low toxicity)NFPA Rating: Health 1, Flammability 1, Reactivity 0

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4. Storage and Handling

Storage:Keep in sealed containers to prevent moisture absorptionStore at 5–30°C (avoid freezing)Handling:Use gloves (nitrile) and gogglesVentilation recommended for high-temperature processing

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5. Applications

Silicone Rubber: Crosslinker for RTV-2 systemsPolymer Modification:Improves flexibility in polyurethanesUsed in epoxy-silicone hybridsCosmetics: Skin-conditioning agent (INCI: Dimethiconol)Industrial Coatings: Provides water repellency

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