Poly(dimethylsiloxane), hydroxy terminated

CAS 70131-67-8Micro / NanoElectronics

Poly(dimethylsiloxane), hydroxy terminated (CAS: 70131-67-8) is a silicone polymer featuring reactive hydroxyl end groups. This versatile compound functions as a plasticizer for silicone elastomers and as a hydrophobic modifying agent for silica. It also serves as a base polymer for silicone water repellents, finding use in diverse applications within materials science and micro/nanoelectronics.

IUPAC: PDMS
Synonyms: Poly(dimethylsiloxane), hydroxy terminatedHydroxy (OH) Terminated PDMSPDMSPDMS Elastomers/ResinsPDMS and Silicone PolymersPolysiloxanesSilicones

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Poly(dimethylsiloxane), hydroxy terminated — chemical structure, CAS 70131-67-8; Materials Science, fine chemical supplied by Tech Serve Solutions

BioelectronicsHomopolymersHydroxy (OH) Terminated PDMSMaterials ScienceMicro/NanoElectronicsMicrofluidicsPDMSPDMS Elastomers/ResinsPDMS and Silicone PolymersPolymer Science

01 /Applications

Silicone Elastomer Plasticization

Acts as an effective plasticizer for silicone elastomers, improving their flexibility and processing characteristics. This enhances the overall performance and workability of silicone-based materials.

Hydrophobic Modification

Used as a hydrophobic modifying agent for silica and other substrates. This property is valuable for applications requiring water repellency or altered surface characteristics.

Water Repellent Formulations

Serves as a primary polymer in the formulation of silicone-based water repellents. These are applied to surfaces to provide durable water-resistant coatings.

Materials Science and Electronics

Its unique siloxane backbone and terminal hydroxyl groups make it suitable for applications in microfluidics, bioelectronics, and micro/nanoelectronics fabrication.

02 /Properties

Boiling point	182 °C
Density	0.95 g/mL at 25 °C
Refractive index	n20/D 1.405
Viscosity	~25 cSt
Application	Chemically incorporates dimethylsiloxane functionality into various polymers. Plasticizer for silicone elastomers, base polymer for silicone water repellents and hydrophobic modifying agent for silica.

03 /Safety & handling

Protective equipment	Eyeshields, Gloves
Flash point	>113 °C / >235.4 °F
Water hazard class (WGK, DE)	1

Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.

04 /Identifiers & registry

CAS number

70131-67-8

MDL number

MFCD01325010

05 /Quality & supply

Documentation

Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.

Supply & logistics

Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.

06 /Frequently asked questions

What is Poly(dimethylsiloxane), hydroxy terminated used for?

Poly(dimethylsiloxane), hydroxy terminated is used as a plasticizer for silicone elastomers, a base polymer for silicone water repellents, and a hydrophobic modifying agent for silica.

What are the CAS number and formula for Poly(dimethylsiloxane), hydroxy terminated?

The CAS number is 70131-67-8. The chemical formula is not provided in the data, but it is a polymer of dimethylsiloxane with hydroxyl end groups.

What grade and purity does Tech Serve Solutions supply?

Tech Serve Solutions supplies Poly(dimethylsiloxane), hydroxy terminated primarily as a technical or research grade material. TSS does not represent this product as USP, BP, EP, or pharmacopoeia grade.

What are the safety and handling precautions for this chemical?

When handling Poly(dimethylsiloxane), hydroxy terminated, it is recommended to use eyeshields and gloves. The flash point is above 113 °C (235.4 °F), indicating it is not highly flammable under normal conditions. Always consult the Safety Data Sheet for comprehensive information.

How is Poly(dimethylsiloxane), hydroxy terminated packed, shipped, and exported?

Tech Serve Solutions professionally packs and ships chemicals globally. Specific packaging details and export compliance are managed according to international regulations and customer requirements.

How can I request a sample or a quote for Poly(dimethylsiloxane), hydroxy terminated?

To request a sample or a quotation, please contact our sales department via the website or direct inquiry. Provide the product name and CAS number (70131-67-8) for efficient processing.