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All Categories > Scrub Resistance Test Panel and Accessories > Leneta - ASTM Scrub and Staining Media > Leneta-ASTM Staining Media > ST-31  
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ST-31 Leneta-ASTM Staining Media

Recommended for ASTM Method D 3258, Test for Stain Resistance and Porosity
This is a proprietary composition of pigment and dark colored dye dispersed in an organic liquid vehicle. When applied and then removed from a paint film, the intensity of the resultant stain indicates the degree of film porosity. ST-31 is more effective than other media recommended for this purpose.

Both media have perfect package stability and are manufactured and control tested to assure batch-to-batch uniformity. Their usefulness extends not only to ASTM tests, but to any soil and stain removal test procedure. Supplied in 4 fl.oz. (118 mL) cans or jars.



Penetrating Dye


4 fl oz

Weight per Jar

1/2 lb

Jars per Case


International Standards

ASTM D 3258


ST-31 SDS for EU
(DOCX, 1054KB)

ST-31 for USA
(PDF, 75KB)

ST-31 MSDS for Canada
(PDF, 33KB)

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