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What is the difference between compression set suffix B2 and B3 in ASTM-D1056?

by | Nov 9, 2021 | Q&A RUBBER LIBRARY | 0 comments

QUESTION:

astmWhat is the difference between compression set suffix B2 and B3 in ASTM-D1056?

ANSWER:

B2 requires a maximum set of 25% B3 allows a maximum set of 35% – John Bonforte, Sr.

People who wanted to learn about ASTM-D1056 were also interested in referencing ASTM 1056 MRPC PRESENTATION 2009 [PDF] – Understanding ASTM D1056 – American Society For Testing Materials D1056 (ASTM D1056); and ASTM D 1056 Explained [PDF]

2 different listings in UL –  please explain to me in detail the difference between JMLU2 & JMST2?

by | Nov 9, 2021 | Q&A RUBBER LIBRARY | 0 comments

QUESTION:

2 different listings in UL –  please explain to me in detail the difference between JMLU2 & JMST2?

ASTMANSWER:

JMLU2 is the generic category (for material properties) while JMST2 is for a specific application.

Gaskets & Seals (JMLU2)

This is the main gasket and seal category that covers elastomeric and composite gasket materials in various forms including “O” rings, seals, shaft seals, flexible cellular gaskets, facings, sheet materials, special forms and poured-in-place gaskets. All materials are investigated with respect to properties including tensile strength, elongation, compression set, tensile set, hardness, low temperature, and the retention of these properties after accelerated aging and exposure to various environments.

This category is designed to provide a profile of the material properties.

These properties help product designers and engineers find materials that meet their requirements and comply with safety standards associated with their products. Materials may also be evaluated to specific end-product standard requirements as requested.

Gasket Materials (JMST2)

This category covers elastomeric materials supplied in sheet form or as formed or cut gaskets. These gaskets are evaluated for use in specific end-product applications.

– John Bonforte, Sr.

What is K factor?

by | Nov 9, 2021 | Q&A RUBBER LIBRARY | 0 comments

QUESTION:

K factor is thermal conductivity (heat transferred per unit of time for unit area for a temperature gradient of one °F per unit length of heat path), Btu-in./h-ft.2-°FWhat is K factor?

ANSWER:

K factor is thermal conductivity (heat transferred per unit of time for unit area for a temperature gradient of one °F per unit length of heat path), Btu-in./h-ft.2-°F

“k”: Thermal conductivity, the amount of heat (Btu’s) transferred in 1 hour through 1 square foot of a homogeneous material 1 inch thick for a difference in temperature of 1°F. For example, the “k” for Durafoam DK1111 is 0.275 at 90°F. This means that for a 1 inch thickness there is a heat transfer of 0.275 Btu per hour per square foot for each degree difference in temperature between its two surfaces. Usually expressed in Btu-in./h-ft.2-°F in the insulation field. – John Bonforte, Sr.

What is the difference between the three different types of Ton – short ton, long ton, and metric ton?

by | Nov 9, 2021 | Q&A RUBBER LIBRARY | 0 comments

QUESTION:

What is the difference between the three different types of Ton - short ton, long ton, and metric ton?What is the difference between the three different types of Ton – short ton, long ton, and metric ton?

ANSWER:

The three types are all a measure of mass (weight) the short ton aka US ton is 2,000/lbs. The long ton aka Imperial (British) ton is 2240 lbs. The third ton is the metric tonne which is, equal to 1000 kilograms, or approximately 2204 pounds.
– John Bonforte, Sr.

What is the Berry Amendment? Also called the Berry Act

by | Nov 9, 2021 | Q&A RUBBER LIBRARY | 0 comments

QUESTION:

What is the Berry Amendment? Also called the Berry Act.

ANSWER:

What is the Berry Amendment? Also called the Berry Act.The Berry Amendment requires the department of defense to buy items that are manufactured in the United states of America. It is part of United States code, title 10 section 2533a

The code is fairly complex, however a certification is required from the manufacturer supplying material to DOD, therefore all companies in the supply chain must also certify that the product they supply is made in the USA. There is an ongoing debate in Congress to various items in the act.

The Berry Act should not be confused with the Buy American act. It is a separate and not directly related to the Berry Act.

Our certification can be found in the library under Technical Information or click here to view our certification. – John Bonforte, Sr.