Tech Today

Differentiating mod bit sheets

There are more than 300 polymer-modified bitumen sheet products currently available in the U.S., and that number doesn't account for the different granule and foil surfacing colors available. Because there are so many products offered, comparing them can be difficult. However, there is a relatively straightforward, technically valid way of comparing and differentiating among polymer-modified bitumen products.

ASTM standards

ASTM International has published six product standards that apply to polymer-modified bitumen products and are useful in evaluating them.

For SBS polymer-modified bitumen sheet products, ASTM D6162, "Standard Specification for Styrene Butadiene Styrene (SBS) Modified Bituminous Sheet Materials Using a Combination of Polyester and Glass Fiber Reinforcements"; ASTM D6163, "Standard Specification for Styrene Butadiene Styrene (SBS) Modified Bituminous Sheet Materials Using Glass Fiber Reinforcements"; ASTM D6164, "Standard Specification for Styrene Butadiene Styrene (SBS) Modified Bituminous Sheet Materials Using Polyester Reinforcements"; or ASTM D6298, "Standard Specification for Fiberglass Reinforced Styrene-Butadiene-Styrene (SBS) Modified Bituminous Sheets with a Factory Applied Metal Surface," apply.

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