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 Tube fitting boss seals are included in AS568 as 900 series O-ring sizes, and are intended for use in MS33649 (now superseded by SAE-AS5202) straight thread tube fitings.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 | ||
| Dash No. | ||
| Metric | Nominal | |
| I.D. | 10.060mm | |
| O.D. | 0.000mm | |
| C/S | 2.030mm | |
| Volume | 0.123cm3 | |
Gland Charts
MATERIALS
Ethylene Propylene
RT/Dygert Stock Material
Other Designations
EP; EPDM; Vistalon® (ExxonMobil)
Composition
Low density terpolymer of ethylene, propylene, and a small amount of a diene
Temperature Range
-65 to 300 °F
Description
Ethylene-Propylene rubber is a low cost, versatile compound that functions well in both low and high operating temperature environments. Moderate to good resistance to a variety of chemicals make it the compound of choice for a variety of applications. EPDM's chemically saturated polymer chain accounts for its superior resistance to degradation. However, use is limited by its incompatibility with petroleum based fluids. EPDM can be cured with sulfur or peroxide, although applications with high heat requirements should use peroxide cured compounds. Peroxide curing also produces vulcanizates with superior compression set than that of the sulfur cures. Reinforcing agents are especially important in Ethylene-Propylene polymers because it lacks gum strength. Therefore, high tensile and tear properties are achieved through high loading. EPDM is a terpolymer, not to be confused with the copolymer EPM, which can only be peroxide cured due to its completely saturated polymer backbone.
*** RT/Dygert's EPDM E7001 compound is not compatible with brake fluid applications***
*** RT/Dygert's EPDM E7001 compound is not compatible with brake fluid applications***
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 | |
| Alcohols | • | |||
| Dilute acids | • | |||
| Dilute alkalis | • | |||
| Gasoline | • | |||
| Hydraulic fluids | • | |||
| Oxygenated solvents | • | |||
| Ozone | • | |||
| Petroleum oils and greases | • | |||
| 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.