Silicone Rubber Products: Rubber Tubing and More
If you need a rubber product that can withstand difficult environments, silicone rubber can be an excellent choice for your applications. When it comes to extreme temperature, silicone rubber offers great resistance, being able to operate normally from -100°C to +250°C (-150°F to +480°F). At extreme temperatures, the tensile strength, elongation, tear strength and compression set can be far superior to conventional rubbers. This makes it one of the materials of choice in many extreme environments.
What is Silicone Rubber used for?
Silicone is a very clean rubber with low odor and taste. In addition to temperature resistance, other advantages of silicone rubber include insulation from electricity, compression set resistance, and the ability to repel water. Because of these advantages, silicone rubber is a versatile material for many industries, including:
Custom silicone rubber parts can be used in the production of:
Caution: Generally, silicones are attacked by most concentrated solvents, oils, acids, and dilute sodium hydroxide.
- Common Name: Silicone
- ASTM D-2000 Classification: FC, FE, GE
- Chemical Definition: Polysiloxane
- Temperature Range
- Low Temperature Usage: -60° to -150° F | -50°C to -100°C
- High Temperature Usage: Up to 480° F | Up to 250°C
- Tensile Strength
- Tensile Range: 200-1500 P.S.I.
- Elongation: 700% Maximum
- Abrasion Resistance: Fair to Poor
- Tear Resistance: Poor
- Solvent Resistance: Poor
- Oil Resistance: Fair to Poor
- Caution: Generally, silicones are attacked by most concentrated solvents, oils, acids and dilute sodium hydroxide.
- Additional Properties
- Aging Weather - Sunlight: Excellent
- Adhesion to Metals: Good
- Durometer (Hardness) Range: 30-90 Shore A
- Compression Set: Good
- Resilience/Rebound: Good
- Industrial Classifications
- Liquid Silicone Rubbers (LSR) - also called heat curable liquid materials. Processed on specially designed injection molding and extrusion equipment.
- High Temperature Vulcanizing (HTV) - also called heat curable silicone, these materials usually are in a semi-solid gum form while in the uncured state. Rubber-type processing is required to produce finished items.
- Room Temperature Vulcanizing (RTV) - usually comes in the form of a flowable liquid. Commonly used for sealants, mold making, encapsulation and potting. RTV materials are generally not used as conventional rubbers.
- Silicone Compounds
- Silicone rubber material can be compounded in different ways to meet any number of applications.
- Silicone fillers can also improve the tensile strength to be in the area of 1500 PSA and tear resistance up to 200lbs.
- Flame retardant additives can be added to increase fire resistant properties.
- Carbon black additive will also increase the silicone's electrical conductivity.
- Square, kink free tubing for furnace pressure switches
- Sound and vibration dampening in automotive drive shaft applications
- Shaft sealing rings
- Silicone O rings
- Window and door seals
- Sealing Gaskets
- Oven door gaskets
- Wire and cable jacketing
- Electrical Safety Stinger Covers
- Conductive profiled silicone seals
- Many closed cell silicone sponge and silicone gaskets have flame retardant properties making them suitable for gasket applications in Mass Transit systems, telecommunications equipment and HVAC applications.
- UL94 V-0 silicones are used in consumer electronics and business equipment and in closed spaces such as aircraft, subways and building interiors.
Benefits & Advantages
- Withstands high & low temperatures far better than organic rubber
- Good thermal stability
- Repels water & forms tight seals
- Excellent electrical insulation, no decline in insulation performance even when immersed in water, making it an ideal insulating material
- Flexible at low temperatures, stiffens up at higher temperatures
- Under ordinary pressure, contact with steam typically causes little or no deterioration
- Flame retardant, will not ignite easily. Some products received UL94 V-0 certification according to the UL94 (USA) standards for flammability classification.
- Unlike most organic elastomers such as EPDM and neoprene, the compression set of silicone rubber is consistent over a wide range of temperatures from -60° to +250°C. The selection of a proper curing agent and post-curing is particularly recommended when using silicone material to make molded products that require a low compression set.
- Customizable for specific applications by adjusting the compound recipe by selecting the proper curing agent and/or post-curing the compound to improve resistance to flames, steam & hot water (over 150C)
- Low chemical reactivity
Why Silicone is the Ideal Material for Extreme Temperatures
Silicone rubber withstands high and low temperatures far better than their organic rubber counterparts.
- Ability to be used continuously at 150°C (302° F) with virtually no change in its properties.
- Certain silicone compounds can withstand use even at 200°C (392° F) for 10,000 hours or more.
- Some silicone rubber products can withstand heat upwards of 350°C (662° F) for short periods.
Silicone rubber also exhibits excellent resistance to cold temperatures.
- Embrittlement point for some silicone parts is between -60° to -70°C, (-76° to -94° F) (organic rubber is between -20° to -30°C, (-4 to -22° F)
- Some silicone products are able to withstand extremely low temperatures, keeping their elasticity at -100°C (-148° F) and below.