Silicone (Silicone rubber) is a kind of highly active adsorption material, belonging to the amorphous substance, its chemical formula is mSiO2•nH2O. Insoluble in water and any solvent, non-toxic and tasteless, chemical stability, in addition to strong alkali, hydrofluoric acid and no reaction with any substance. Different types of silicone rubber form different microporous structures due to their different manufacturing methods. The chemical composition and physical structure of silicone rubber determine that it has many other similar materials are difficult to replace the characteristics: high adsorption performance, good thermal stability, chemical stability, high mechanical strength, etc.

According to the performance can be divided into ordinary silicone rubber and fumed silicone rubber.

Ordinary silicone rubber (also known as precipitated silicone rubber)

Color: translucent, milky white, light yellow, gray, etc.

Hardness: 30 °, 40°, 50°, 60°, 70°, 80°, etc.commonly used between 40° -70 °.

Density: 1.1 to 1.12 g/cm2

Elongation: 400%

Usage: The most used are mobile phone keys, miscellaneous parts, conductive adhesive and other low - and medium-grade silicone products.

Fumed silicone rubber (also known as pure silicone rubber)

Color: transparent.

Hardness: 30°, 40°, 50°, 60°, 70°, 80°, etc., commonly used between 40° -60 °.

Density: 1.1-1.12g/cm2 elongation: 600%-700% Characteristics: due to the good transparency of this material, strong tensile resistance. The cost is high.

Application: Silicone tube, protective sleeve and other high-grade products requiring high elasticity.

According to physical properties can be divided into solid silicone rubber and liquid silicone rubber

Solid silicone rubber is mainly used for molding products. For example: silicone rubber cover, silicone rubber tableware, silicone rubber button and so on

Liquid silicone rubber is mainly used for extrusion molding products, such as silicone rubber nipple, silicone rubber tube, etc.

The main performance

Heat resistance

Silicone rubber has much better heat resistance than ordinary rubber and can be used almost forever at 150 degrees without a change in performance; It can be used continuously for 10,000 hours at 200 degrees. It can also be used for a period of time at 350 degrees. Widely used in heat resistant occasions: thermos sealing ring pressure cooker ring heat resistant handle.

Cold tolerance

Ordinary rubber is -20 degrees ~-30 degrees, silicone rubber is -60 degrees ~-70 degrees still has good elasticity, some special formula of silicone rubber can also withstand very low temperature. For low temperature sealing ring.

Hou resistance

Ordinary rubber degrades rapidly under the action of ozone produced by corona discharge, while silicone rubber is not affected by ozone. And long time in ultraviolet light and other climatic conditions, its physical properties also only small changes. Sealing material for outdoor use.

electrical

Silicone rubber has high electrical resistivity and its resistance remains stable over a wide range of temperatures and frequencies. At the same time, silicone rubber has good resistance to high voltage corona discharge and arc discharge. High voltage insulators, TV high voltage caps, electrical components.

The electrical conductivity

When joining conductive filler (such as carbon black), silicone rubber will be electric keyboard, electric heating element, antistatic conductive contact part, high voltage cable shielding, medical therapy conductive film thermal conductivity: when add some thermal conductive filler, silicone rubber with a thermal conductivity heat sink, thermal conductive gasket, photocopiers, fax machines, roller heat.

Radiation resistance

The radiation resistance of silicone rubber containing phenyl greatly improves electrical insulation cables, connectors for nuclear power plants, etc.

Flame retardant

Silicone rubber itself combustible, but add a small amount of anti-combustible agent, it has flame retardant and self-extinguishing; And because silicone rubber does not contain organic halides, it does not emit smoke or poisonous gas when burning. All kinds of fire strict occasions.

permeability

Silicone rubber film has better air permeability than ordinary rubber and plastic waxing film. Another characteristic is that it has strong selectivity to different permeability. Such as gas exchange membrane medical supplies, artificial organs.

High hardness: long mixing time, high temperature, strong static electricity, difficult mixing, mixing time.

Low hardness: short mixing time, low temperature, weak static electricity, easy mixing, short mixing time.

High hardness: high density, small shrinkage, poor fluidity, easy to less material, than the major, feel good, high load.

Low hardness: low density, large shrinkage, good fluidity, easy to wrap wind, small specific gravity, feel poor, low load.