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SAE ARP3050 2007 Edition, February 1, 2007
Suitable Test Sizes for O-ring Specifications
Description / Abstract:
Purpose
There are many tests that have been developed to characterize rubber O-rings. Many of these tests are independent of the size of the O-ring being tested. However, there are some tests, specifically, stress/strain properties, that are a function of the O-ring's size. The purpose of this report is to provide guidelines for specifying O-rings that would be considered "suitable for testing" when writing O-ring material specifications.
Background
The vast majority of O-ring specifications written to date do not specify a specific O-ring size as the appropriate test specimen. Typically, phrases like "the finished part," "if of suitable size," or " the end item" are used when conformance testing is referred to. Currently, this situation is handled by the O-ring manufacturer on a case-by-case basis through discussions with the customer. The reason why this is problematic is that physical properties can change as the O-ring size being tested changes. It should be noted that some polymer families are more sensitive to this phenomenon than others.
There are many tests that have been developed to characterize rubber O-rings. Many of these tests are independent of the size of the O-ring being tested. However, there are some tests, specifically, stress/strain properties, that are a function of the O-ring's size. The purpose of this report is to provide guidelines for specifying O-rings that would be considered "suitable for testing" when writing O-ring material specifications.
Background
The vast majority of O-ring specifications written to date do not specify a specific O-ring size as the appropriate test specimen. Typically, phrases like "the finished part," "if of suitable size," or " the end item" are used when conformance testing is referred to. Currently, this situation is handled by the O-ring manufacturer on a case-by-case basis through discussions with the customer. The reason why this is problematic is that physical properties can change as the O-ring size being tested changes. It should be noted that some polymer families are more sensitive to this phenomenon than others.
SAE ARP3050 2007 Edition, February 1, 2007
Suitable Test Sizes for O-ring Specifications