ASTM's Asphalt Solubility Standard Provides Banned Solvent Alternative

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ASTM's Asphalt Solubility Standard Provides Banned Solvent Alternative

August 17, 2009 // Published as a news service by IHS

ASTM International

ASTM D7553 - Test Method for Solubility of Asphalt Materials in n-Propyl Bromide

This standard on asphalt solubility is intended to provide an alternative for a solvent - trichloroethylene - that was banned as an ozone depleter by the Kyoto Protocol.

The Kyoto Protocol is an international environmental treaty with the goal of stabilizing greenhouse gas (GHG)concentrations that may help minimize global warming, according to ASTM.

ASTM D7553 was developed by Subcommittee D04.47 on Miscellaneous Asphalt Tests, part of ASTM Committee D04 on Road and Paving Materials.

The main impetus for developing ASTM D7553 was that almost all asphalt specifications have a requirement for a maximum amount of insoluble matter to ensure that undesirable materials are not blended into the products, said Stephen Burhans, a D04 member.

The solvent covered by ASTM D7553, n-propyl bromide, was approved by the U.S. Environmental Protection Agency (EPA) under its Significant New Alternatives Policy as an alternative to CFCs.

"Since ASTM D7553 does not have a complete multi-laboratory precision statement, it cannot yet be substituted in the various specifications for buying and selling purposes," said Burhans. "We will be working with ASTM's interlaboratory studies staff to seek participants in a round robin study to develop a complete precision statement later this year."

Once the precision statement is completed and ASTM D7553 has been revised accordingly, Burhans said the process of revising those standards that currently specify ASTM D2042 for solubility will begin.

Standards from Committees D04 and D08 on Roofing and Waterproofing that reference ASTM D2042 will be revised at that time.