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LF-OHPM Phenyl Methyl Hydroxy Silicone Oil

Name: LF-OHPM Phenyl Methyl Hydroxy Silicone Oil
Brand: Nanjing Silfluo New Material Co., Ltd.
Availability: InStock

Chemical Name: Phenyl Methyl Hydroxy Silicone Oil; Hydroxy-terminated Phenylmethyl Siloxane

CAS NO.: 80801-30-5

Molecular Formula: HO-[Si(CH₃)(C₆H₅)O]ₙ-H

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Descritpions of Phenyl Methyl Hydroxy Silicone Oil LF-OHPM

Silfluo LF-OHPM is a silanol-terminated polymethylphenylsiloxane (CAS 80801-30-5) with methylphenylsiloxane repeat units and reactive Si–OH end groups on both chain termini.

The mixed methyl-phenyl substitution on silicon places LF-OHPM between standard PDMS (LF-OHP, methyl only) and fully diphenyl-substituted LF-OHP2 in terms of refractive index (1.430–1.500), thermal stability, and low-temperature flexibility — the methyl groups retain chain flexibility that the all-phenyl LF-OHP2 sacrifices, while the phenyl groups raise RI, thermal stability, and radiation resistance above standard PDMS.

Viscosity range (500–20,000 mPa·s) spans medium to high molecular weight, allowing selection based on required compound processing viscosity and target cured elastomer mechanical properties.

Silfluo Code:	LF-OHPM
Chemical Name: Synonyms	Silanol-Terminated Polymethylphenylsiloxane Phenyl Methyl Hydroxy Silicone Oil; Hydroxy-Terminated Phenylmethyl Siloxane
CAS No. :	80801-30-5
Molecular Formula:	HO-[Si(CH₃)(C₆H₅)O]ₙ-H
Appearance:	Clear to yellowish transparent viscous liquid
Viscosity (25°C, mPa.s):	500-20000
Density (25°C, g/cm³):	0.98
Refractive Index(25°C, nD25)	1.430 ~ 1.500
Chemical Structure:

Applications of Phenyl Methyl Hydroxy Silicone Oil LF-OHPM

1. Optical and LED Encapsulants

Used as reactive base polymer in optical-grade silicone encapsulants for LED packages and optical lens coatings. Refractive index of 1.430–1.500 provides better RI matching to LED chip surfaces than standard PDMS encapsulants, improving light extraction efficiency. Phenyl groups contribute UV and thermal yellowing resistance. Methyl groups retain sufficient chain flexibility for thermal cycling resistance — an advantage over all-diphenyl LF-OHP2 in applications involving repeated thermal shock. Verify RI, optical transmission, and yellowing resistance via cured sample testing against package specifications.

2. High-Temperature Resin Modifier

Used as reactive modifier for silicone resins, epoxies, and polyimides. Silanol end groups condense with resin hydroxyl or alkoxy groups, incorporating flexible methylphenylsiloxane segments into the polymer matrix. Phenyl groups contribute thermal oxidative stability and ablation resistance; methyl groups maintain network flexibility and prevent embrittlement under thermal cycling. Addition level and grade selection should be optimized for target modulus, elongation, and thermal performance via formulation trials.

3. Extreme-Temperature RTV Sealants

Used as base polymer for RTV-1 and RTV-2 sealants specified for continuous high-temperature service in aerospace, automotive exhaust sensor, and nuclear applications where standard PDMS-based RTV systems undergo thermal oxidative degradation. Select crosslinker type (alkoxy or oxime) based on substrate compatibility and by-product requirements; verify heat aging performance at target service temperature via cured elastomer testing.

4. Specialty Coatings and Damping Compounds

Used as reactive intermediate for synthesizing weather-resistant industrial coatings and high-temperature damping compounds, where phenyl group thermal stability and elevated RI are required alongside silanol end-group reactivity for network formation or substrate anchoring.

Package & Storage of Phenyl Methyl Hydroxy Silicone Oil LF-OHPM

In 200kg/drum; 1000kg/IBC.
Keep in cool, dry and ventilated place. Keep away from sunlight and fire sources. Keep in unopened containers, shelf life is 24 months from the date of production. It is shipped as non-hazardous substance.
Storage beyond the shelf life does not necessarily mean that the product is no longer usable. In this case however, the properties required for the intended use must be checked for quality assurance reasons.

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