5 colours reference glass disc for organic impurities test - ASTM C40
The CTRMAT color standard is the ultimate rapid diagnostic tool for any aggregate producer or concrete plant. Based on the colorimetric method specified in ASTM C40, this reference disc allows you to visually determine in a matter of seconds whether sand is contaminated with harmful organic matter. With its 5 calibrated standard shades, you have a reliable reference for determining the compliance of your materials, thereby ensuring the quality and durability of your concrete mixes.
Instant classification through visual comparison.
5 standardized shades covering the entire spectrum of contamination.
Essential for the ASTM C40-04 standard test.
Lightweight and durable design for field use.