O-Rings

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 Tube fitting boss seals are included in AS568 as 900 series O-ring sizes, and are intended for use in MS33649 (now superseded by SAE-AS5202) straight thread tube fitings.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.
MATERIALS
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Polyacrylate Rubber

Non-Stock Material

Other Designations

Polyacrylic; Hycar® (Goodrich); ACM

Composition

Medium density acrylic ester copolymer

Temperature Range

0 to 350 °F

Description

Polyacrylate rubber, or ACM, is a specialty rubber whose primary strength is its ability to withstand high heat while retaining oil resistance. It is often the material of choice for applications that involve sulfur bearing lubricants, which are finding increased usage in automotive applications, especially transmission seals. From a performance standpoint, ACM occupies an intermediate position between nitrile and fluorocarbon. In addition, polyacrylates exhibit good damping characteristics, are not highly corrosive to steel, and can be compounded to provide excellent flex life and some degree of flame resistance. However, this acrylic based elastomer does have some limitations. Poor low temperature flexibility limits its usefulness and compression set is not as good as most other compounds. It is also inferior to many other elastomers in strength and water resistance.
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
Alipathic solvents   •    
Dilute acids     •  
Dilute alkalis     •  
Ozone •      
Steam       •
Sulfer containing oils   •    
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.