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 Tube fitting boss seals are included in AS568 as 900 series O-ring sizes, and are intended for use in MS33649 (now superseded by SAE-AS5202) straight thread tube fitings.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
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| AS568A | 221 | |
| Dash No. | ||
| US | Nominal | |
| I.D. | 1.421" ± .012" | 1-7/16 |
| O.D. | .000" | 1-11/16 |
| C/S | .139" ± .004" | 1/8 |
| Volume | .074in3 | |
Gland Charts
MATERIALS
Chloroprene Rubber
RT/Dygert Stock Material
Other Designations
Neoprene® (duPont); CR; polychloroprene
Composition
Produced from the chloroprene monomer, a combination of chlorine and butadiene. Medium density.
Temperature Range
-40 to 275 °F
Description
Chloroprene (commonly known as "Neoprene") is one of the oldest synthetic elastomers. Introduced in 1931, it is used in a variety of applications due to its ability to resist both oils and oxidation. The oil resistance, however, depends significantly on the type of oil. Chloroprene has good resistance to napthenic and paffaffinc oils of high molecular weight, but swells excessively in aromatic oils of low molecular weight. Vulcanizates of chloroprene display little significant change after prolonged outdoor exposure. Because of its chlorine content, flame resistance is superior to that of most other rubbers. Some chloroprene vulcanizates, especially O-Rings, sometimes exhibit distortion due to crystallization of the rubber at room temperature. This effect can be completely reversed by warming the parts in low heat. Chloroprene is especially well suited to rubber-to-metal bonding.
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 | |
| Aromatic & oxygenated solvents | • | |||
| Automotive refrigerants | • | |||
| Dilute acids | • | |||
| Dilute alkalis | • | |||
| Ozone | • | |||
| 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.