



inquiry@silfluo.com

EN 

English

日本語

한국어

français

Deutsch

Español

русский

português

العربية

tiếng việt

ไทย

Products

Application

Company

Support

News

English 日本語 한국어 français Deutsch Español русский português العربية tiếng việt ไทย

 



Home

Products 

Silanes & Catalysts Silicone Fluids & Reactive Polymers Silicone Resin Silicone Rubber Silicone Surfactant Conformal Coating Fluorinated Electronic Coating

Application 

Adhesives & Sealants Aerospace Agriculture Building & Construction Coating & Paints Electric Power & Telecommunication Electronics Fiberglass & Composite Healthcare Personal Care New Energy Railway & Automotive Surface Treatment

Company

Support 

Silicones Wiki Product Brochures FAQ Services

News 

Industry News Exhibitions & Events

Email Us

LS-6345 Methylphenylcyclosiloxane
CAS NO.: 546-45-2 & 77-63-4 & 34239-75-3

Name: LS-6345 Methylphenylcyclosiloxane
Brand: Nanjing Silfluo New Material Co., Ltd.
Availability: InStock

Silfluo LS-6345 is a mixed cyclic methylphenylsiloxane oligomer, comprising a blend of tricyclic (D3MePh), tetracyclic (D4MePh), and pentacyclic (D5MePh) forms.

Each ring unit contains alternating methyl and phenyl substituents on the Si–O backbone.

The methyl groups contribute low-temperature flexibility; the phenyl groups raise refractive index, thermal stability, and radiation resistance relative to dimethylcyclosiloxane analogs.

Used as monomer for ring-opening polymerization of phenyl silicone rubbers (PVMQ) and fluids, and as functional ingredient in personal care and optical resin formulations.

Where to buy CAS NO.: 546-45-2 & 77-63-4 & 34239-75-3 PDF Download

Typical Technical Properties of LS-6345 Methylphenylcyclosiloxane

Silfluo Code:	LS-6345
Chemical Name: Synonyms:	Methylphenylcyclosiloxane (Mixture of D3MePh, D4MePh, D5MePh)
CAS No.:	546-45-2 (D3), 77-63-4 (D4), 34239-75-3 (D5)
Viscosity(mm²/s):	50-300
Appearance:	Colorless, transparent, oily liquid or with white crystals
Purity (by GC, %):	98.0 min
Density (20°C, g/cm³):	1.08
Refractive Index (nD 20°C):	1.54-1.55
Boiling Point:	160-260°C, 0.13kPa
Flash Point:	>200°C
Chemical Structure:

Applications of LS-6345 Methylphenylcyclosiloxane

1. Phenyl silicone rubber (PVMQ) synthesis

Used as primary cyclic monomer for ring-opening polymerization of methylphenyl silicone elastomers for extreme-temperature applications.

2. Phenyl silicone fluids and resins

Used as building block for radiation-resistant damping fluids, high-temperature heat transfer oils, and high-RI optical encapsulant resins.

3. Personal care and cosmetics

Used as sensory fluid and optical modifier in skincare, sunscreen, and color cosmetic formulations.

4. Medical and pharmaceutical polymers

Used in the synthesis of biocompatible silicone materials for medical tubing, wound care, and pharmaceutical applications.

Packing of LS-6345 Methylphenylcyclosiloxane

In 1kg fluorinated bottle, 25kg pail and 200kg drum.

Safety and Storage of LS-6345 Methylphenylcyclosiloxane

Keep in a cool, dry, and well-ventilated environment, strictly avoiding direct sunlight, heat, and ignition sources. The shelf life is 12 months from the date of manufacture when stored in original unopened containers. Classified as a non-hazardous substance for transport and handling. Storage beyond the shelf life does not necessarily mean the product is unusable; however, the properties required for the intended use must be thoroughly checked for quality assurance reasons prior to application.

Products

Silanes & Catalysts

 

Phenyl Silane & Siloxane 

LS-653 Phenyl Siloxane

LS-P60 Phenyl Siloxane

LS-M11 Phenyltrimethoxysilane

LS-E11 Phenyltriethoxysilane (Donor A)

LS-M12 Diphenyldimethoxysilane

LS-E12 Diphenyldiethoxysilane

LS-M13 Dimethoxymethylphenylsilane

LS-M14 Methoxytriphenylsilane