The ASTM standard for linear dimensional stability (ASTM D 1204) was originally 2% maximum. In the mid-90s the standard was changed to 1% maximum. The change in the ASTM standard was influenced by the belief that membrane shrinkage may be a contributor to the bridging seen on some old ballasted applications. In reality, EPDM has always exhibited a dimensional stability value of much less than 1%, even when the ASTM Standard was 2%.

The ability to maintain the original intended dimensions when influenced by a foreign substance. Wood is hygroscopic, and is not dimensional stable with changes in moisture content below the fiber saturation point.

To increase interconnection density, microvias need to be associated with small pads. This requires a highest level of dimensional consistency and predictability, which is enhanced by non-glass-reinforced materials.

Our products meet the ASTM standard put in place for that particular product. Some of our products do not have a standard set forth by ASTM. However, we still maintain a high quality of production on these parts.

ASTM standards are used by individuals, companies, and agencies around the world. Purchasers and sellers incorporate standards into contracts; scientists and engineers use them in their laboratories and offices; architects and designers use them in their plans; government agencies around the world reference them in codes, regulations, and laws; and many others refer to them for guidance. ASTM standards are ?voluntary? in the sense that their use is not mandated by ASTM.

Standards development work begins when members of an ASTM technical committee identify a need or other interested parties approach the committee. Task group members prepare a draft standard, which is reviewed by its parent subcommittee through a letter ballot. After the subcommittee approves the document, it is submitted concurrently to the main committee and the entire membership of ASTM.

ASTM has over 30,000 members from more than 100 countries around the world who are producers, users, consumers, and general interest parties, such as academicians and government representatives. These members write ASTM standards through their service on one or more of ASTM’s 130-plus technical committees.It is these members who determine which standards development activities to pursue.

Yes. See the Intellectual Property Policy, available on the ASTM homepage at www.astm.org or request a copy from Headquarters at +1 610/832-9500.

The ASTM standard for glazed concrete blocks is ASTM C744. There was a Federal Standard SSC 621B which was discontinued because it was virtually identical to ASTM C744. If you ever see a reference to Federal Specification SSC 621B, know that this standard has been superseded by ASTM C744 which is virtually identical.

ASTM developed standards which include a category intended to protect children five years of age and under. ASTM Standard F1346-91 for spa covers includes specific performance tests and labeling requirements. Covers must be able to pass certain tests. The first is Static Load. "In the case of spas with a width or diameter greater than 8' from the periphery, the cover shall be able to hold a weight of 485 pounds to permit a rescue operation.

Stability of the product is related to the expiration date, which delineates the period of time for which the product has been tested and demonstrates compatibility with the potency of the label claim.

Krueger can manufacture security grilles that meet ASTM A750. ASTM A750 applies to ventilating grilles for detention areas. ASTM A750 references four material specifications. They are: ASTM A6, A29, A627, and A629. A6 covers structural shapes and plates. A29 is for steel bars. A627 and A269 cover tool-resisting steel. Construction to ASTM standards is expensive due to special testing methods, materials tracing, special material specifications, and heat treating.

ASTM site investigation/assessment standards attempt to encapsulate best practices that have been demonstrated and have broad technical acceptance in a replicable set of methods and approaches. For example, there already is an ASTM standard for conducting Expedited Site Characterization work (D6235-98a), one of the historical improvements in the characterization process that the Triad has built on.

Copies of the following referenced standards may be obtained from the American Society for Testing and Materials, 100 Bar Harbor Drive, West Conshohocken, Pennsylvania 19428, www.astm.

From its inception, ASTM’s method of developing standards has been based on consensus without borders. ASTM’s process ensures that interested individuals and organizations representing academia, industry, product users, and governments alike all have an equal vote in determining a standard’s content. Participants are welcome from anywhere on the globe. Further, ASTM’s high quality standards are responsive and relevant to the needs of the global marketplace.

EPDM is a synthetic rubber polymer made from ethylene and propylene monomers. It was developed in the early 1960's and is used in radiator and steam hoses, freezer gaskets, tires, roofing membranes and aircraft seals to name only a few applications where EPDM is superior to other materials.

BB: An important question . . . Stability is another advantage of NON-GELSô over softgels. NON-GELSô control odor and leakage effectively, and don't melt like gelatin, which is a big plus in the international market, where you're sending product to hot, humid climates. Also internationally, there's a huge potential market in those parts of the world with vegetarian traditions.

ASTM is an independent, not-for-profit standards-writing organization. They promulgate standards in many diverse technical disciplines. ASTM is the forum for a majority of standards in the USA, especially those related to plastic materials and products testing. ASTM writes standards and conducts educational training seminars (specifications, test methods and guides). ASTM does not conduct testing, listing, certifying, or enforcement of its standards. [Back]

A dimensional shingle is a shingle that is textured, or laminated and designed to produce a three-dimensional effect. This shingle is sometimes called an architectural shingle. Dimensional shingles are a very popular style of shingle and they normally come with a life expectancy of thirty, forty, and fifty years. The higher the year of life expectancy the more three-dimensional effect you will receive on your home.