• Consistency: 30 parts water to 100 parts powder by weight.
• Setting time: 7-10 minutes.
• Tensile strength: 600 PSI .
• Maximum expansion: 0.13 of 1%

One method to collect footwear or tire track impressions in dirt is by casting them. Dental stone/casting powder produces clean, detailed impressions and maximum strength consistent with minimum setting and thermal expansion. Dental stone is superior to plaster of paris because of its strength and quality of neither shrinking nor expanding noticeably. It is available in one-gallon (9 lbs. powder) plastic jars or in 25-pound cartons. An average cast of a footwear impression requires about 2 to 3 pounds of dental stone. A tire track, depending on the length will take about 4 to 7 pounds of dental stone. Ask for our free Technical Note on casting tips.