Name: Hydroxy Silicone Oil
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Hydroxy Silicone Oil

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INTRODUCTION

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Synonyms: Dimethyl hydroxy silicone oil, hydroxyl-terminated polysiloxane, α,ω-dihydroxy-terminated polydimethylsiloxane, linear silicone

Chemical Formula: HO[(CH3)2SiO]nH

Molecular Weight: 300–50000

CAS No.: 70131-67-8

EINECS No.: 213-915-7

Physical and Chemical Properties

Melting point: Below -60 ℃
Water solubility: Low molecular weight slightly soluble in water; high molecular weight insoluble in water
Density: 0.95–0.98 g/cm³
Appearance: Colorless or light yellow transparent liquid, odorless
Flash point: Above 200 ℃
Viscosity: 20 / 30 mm²/s

Safety Information

Safety Instructions: S23, S24/25, S26, S36
Hazard Symbol: Xi (Irritant)
Risk Codes: R36/37/38

Applications

Hydroxy silicone oil is widely used in silicone emulsions, textile/paper/leather treatments, silicone rubber structure control agents, and various polysiloxane intermediates.

1. Low Molecular Weight Hydroxy Silicone Oil

Used for preparing block polymers and defoamers.
Excellent structure control agent for silicone rubber: improves processability, extends shelf life, enhances transparency and mechanical properties.
Used to produce cationic, anionic, non-ionic hydroxy silicone emulsions; combined with hydrogen-containing silicone oil, serves as high-performance treatment agent for textiles, leather and paper.

2. High Molecular Weight Hydroxy Silicone Oil

Main base polymer for room-temperature vulcanized (RTV) silicone rubber.
Provides excellent high/low temperature resistance, oxidation resistance and electrical insulation.
Used in electronics, electrical appliances, cutting-edge defense tech and other industrial fields.

Application Fields

Silicone Rubber

Low molecular weight hydroxy silicone oil effectively inhibits structuring.

Reacts with Si–OH groups on silica to make it hydrophobic.
Improves silica dispersion, prevents structuring, reduces gel formation and compound viscosity.
Optimizes hardness, permanent set and tensile strength of cured rubber.

Softener

Blended with hydrogen-containing silicone oil to form emulsions for textile finishing.

Forms a durable silicone film on fibers at approx. 140℃.
Provides soft, stiff handle and durable water repellency.
Heat-set film is alkali-resistant and wash-resistant.

Concrete Admixture

Added to mixing water to improve frost resistance, dynamic elasticity, compressive strength and flexural strength of concrete.

Environmental Treatment

Used to make high-efficiency oil-absorbing materials for oil spill cleanup.

Hydrophobizes fiber substrates to greatly reduce water absorption and boost oil absorption.

Heat-Shrinkable Materials

Improves compatibility between silicone rubber and other components in outdoor heat-shrinkable tube compounds.

Increases tensile strength and elongation at break by more than 50%.
Eliminates cracking during processing and meets performance requirements for radiation-crosslinked heat-shrinkable products.