Durometer The Model 306L ASTM Type A durometer measures hardness of rubber, elastomers and other rubber-like materials, including polychloroprene, polyurethane, silicone, vinyl and butyl. Soft plastics and similar materials fall into this same range. The Model 306L is said to meet or exceed current ASTM D2240 specifications. Hardness is one of the most significant physical properties of elastomeric compounds, according to the company. Hardness is said to reflect all, or in part, such other qualities as resilience, durability, uniformity, tensile strength and abrasion resistance. The instrumen...
