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 Tube fitting boss seals are included in AS568 as 900 series O-ring sizes, and are intended for use in MS33649 (now superseded by SAE-AS5202) straight thread tube fitings.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. | 100.000mm | |
| O.D. | 0.000mm | |
| C/S | 4.000mm | |
| Volume | 4.106cm3 | |
Gland Charts
MATERIALS
Viton® ETP (duPont)
Non-Stock Material
Other Designations
Viton "Extreme"
Composition
High density terpolymer of ethylene, tetrafluoroethylene, and perfluoromethyl vinyl ether
Temperature Range
-10 to 400 °F
Description
Viton® ETP, or Viton® Extreme, is resistant to the same fluids as high fluorine FKMs such as aliphatic and aromatic hydrocarbons, hydraulic fluids, motor oils, fuels, etc., but is also resistant to strong bases and polar fluids such as potassium hydroxide, ketones, MTBE and complex solvent mixtures. In fact, Viton® ETP has the broadest fluid resistance of any FKM polymer on the market, making it ideal for severe service environments. Although costly, it can frequently be substituted for far more expensive perfluoroelastomers, at a fraction of the cost.
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 | |
| Acetic acid | • | |||
| Acetone | • | |||
| Amines | • | |||
| Butyl acetate | • | |||
| Concentrated Bases | • | |||
| Ethylene diamine | • | |||
| KOH | • | |||
| Nitric acids | • | |||
| Polar solvents | • | |||
| Tetrahydrofuran | • | |||
| Tolune | • | |||
| Water | • |
*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.