Glossary

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Ball Rebound Test - One of several test methods for comparing flexible foam for resilience (see Resiliency). Basically, a steel ball of specified mass is dropped from a fixed height onto a foam sample, and the height of the rebound of the ball is recorded. The rebound height is divided by the original height to give a percentage. The method is a relative test rather than absolute, since the density of the foam has a strong influence on the results.

Batch Number - On Rubberlite certifications this basically means ship date. An example would be A-110. The A stands for the month, 11 stands for the day and the 9 stands for the year. The result of this example would be January 11, 2000.

Blemish - An imperfection occurring in a cellular rubber product. It is usually circular in appearance and does not go completely through the material. Sometimes referred to as a dimple.

Blend Materials - Various polymers used in the manufacture of cellular rubber materials that are blended together to give a product a wide range of resistance properties.

Blowing Agent - Various chemicals used in the manufacture of cellular rubber products that cause the material to expand by giving off a gas when they are exposed to heat.

Bun - A cellular rubber product that is manufactured in a mold and is usually rectangular in appearance. Also known as a block and/or plank.