What does PPD stand for?

Pour Point Depressant

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.

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Samples in periodicals archive:

Because they have highly branched structures, the diesters make good pour point depressants.

Alpha Olefins answers

High-value additives such as antioxidants, defoamers, pour point depressants and other smaller-volume products will post above-average gains, benefitting from tightening performance, environmental and safety standards.

US lubricant additives demand to reach $1.7 billion in 2006

The specific end-use segments discussed are Antioxidants, Antiwear Agents, Corrosion Inhibitors, Detergents, Dispersants, Extreme Pressure Additives, Foam Control Agents, Pour Point Depressants, and Viscosity Index Improvers.

Annual Forecasts to 2010 for the Worldwide Markets for Petroleum ...