O-Rings
Additional Information
There are several different standards to choose from when it comes to O-ring dimensions. The most popular in the United States is the AS568 standard for O-ring sizes and tolerances. Maintained by the Society of Automotive Engineers, this standard allows the user to choose from five different cross-sections with inside diameters ranging from 1/32" to 26". Tube fitting boss seals are included in AS568 as 900 series O-ring sizes, and are intended for use in MS33649 (now superseded by SAE-AS5202) straight thread tube fitings. RT/Dygert also offers a wide array of metric sizes, in both standard and non-standard dimensions. As a subset of the metric sizes offered, we also stock many Japanese Industrial Standard (JIS B2401) sizes. If an O-ring with special size or fluid resistance is required, RT/Dygert can provide custom O-rings, specially made to your demanding requirements.
SIZES
« Back
| AS568A | ||
| Dash No. | ||
| Metric | Nominal | |
| I.D. | 6.000mm | |
| O.D. | 0.000mm | |
| C/S | 2.000mm | |
| Volume | 0.079cm3 | |
Gland Charts
MATERIALS
SBR
Non-Stock Material
Other Designations
SBR; Duradene® (Firestone)
Composition
Low density copolymer of styrene and butadiene
Temperature Range
-65 to 225 °F
Description
Styrene-Butadiene rubber is much like natural rubber in many of its properties and is one of the lowest cost and highest volume elastomers available. Although its physical properties are somewhat less than natural rubber, SBR is tougher and slightly more resistant to heat and flex cracking. Much of its usage is in tire treads especially blended with other polymers. It can readily be substituted for natural rubber in many applications, thereby achieving significant cost savings. SBR is sometimes referred to as "GR-S" or Government Rubber-Styrene, as its development began as a wartime emergency, necessitated by an interrupted supply of natural rubber. SBR is actually a generic term covering a wide vareity of synthetic rubbers differing not only in the styrene-butadiene ratio, but also in the type of ploymerization by which they are made.
Information above applies to the generic material. Specific compounds may exhibit different properties.
Physical Properties*
| Excellent | Good | Fair | Poor | |
| Abrasion resistance | • | |||
| Compression Set | • | |||
| Elongation | • | |||
| Flame resistance | • | |||
| Gas permeability | • | |||
| Low temperature flexibility | • | |||
| Tear resistance | • | |||
| Tensile strength | • |
Chemical Resistance*
| Excellent | Good | Fair | Poor | |
| Acetone | • | |||
| Air | • | |||
| Alcohols | • | |||
| Diester oils | • | |||
| Glycol | • | |||
| Mineral oil | • | |||
| Oxidation | • | |||
| Ozone | • | |||
| Silicone Fluids | • | |||
| Steam | • | |||
| Water | • | |||
| Weather | • |
*Excellent, good, fair and poor are intended to serve as general guidelines only. Actual testing in the application environment is always recommended.
Information above applies to the generic material. Specific compounds may exhibit different properties.