Siloxane Backbone: Density 0.97-1.02 g/cm³

Component Specifications

Definition

The siloxane backbone consists of alternating silicon and oxygen atoms (Si-O-Si) with organic side groups attached to silicon. This inorganic-organic hybrid structure imparts unique properties such as high thermal stability, low surface tension, and resistance to oxidation and UV radiation. In silicone resins, the backbone length and crosslinking density determine mechanical strength and hardness.

Working Principle

The siloxane backbone is synthesized via hydrolysis and condensation of organosilicon monomers (e.g., dimethyldichlorosilane). The Si-O bond has high bond energy (452 kJ/mol), providing thermal stability. Flexibility arises from the low rotational barrier around the Si-O bond. Crosslinking occurs through residual silanol groups or functional side chains, forming a three-dimensional network.

Materials

Polydimethylsiloxane (PDMS) with controlled molecular weight; vinyl or phenyl groups for crosslinking; purity >99%.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Density	0.97-1.02 g/cm³
Viscosity	100-10,000 cP at 25°C
Molecular Weight	10,000-100,000 g/mol
Thermal Decomposition Temperature	>350°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 14526, DIN 16946

Parent Products

This component is used in the following industrial products

Silicone Resin

A synthetic polymer derived from silicon, oxygen, and organic groups, known for its thermal stability, electrical insulation, and weather resistance.

View Product Details

Engineering Analysis

Risks & Mitigation

Hydrolysis sensitivity in acidic conditions
Potential for cyclic siloxane formation during synthesis

FMEA Triads

Trigger: Incomplete condensation
Failure: Reduced crosslinking density leading to soft resin
Mitigation: Optimize reaction time and catalyst concentration

Trigger: Contamination with water
Failure: Premature gelation
Mitigation: Use anhydrous conditions and dry raw materials

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±5% for molecular weight distribution

Test Method

Gel Permeation Chromatography (GPC) per ASTM D5296

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

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Inspection readiness

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Manufacturers of Siloxane Backbone

Manufacturer profiles associated with Siloxane Backbone.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the siloxane backbone?

It is the repeating Si-O-Si chain that forms the core of silicone resins, providing flexibility and thermal stability.

How does the siloxane backbone affect silicone resin properties?

It imparts high thermal stability, low surface tension, and resistance to oxidation and UV radiation.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Siloxane Backbone