Models 306L, 307L and 302SL Durometers

These instruments feature a heat-treated, high carbon steel mainspring that is precision and centerless ground. Each spring is calibrated to meet or exceed ASTM Specification D2240-81. A special cam permits a scale deflection of 100 points when the indenter is displaced exactly 0.100 inch. The dial scale is extended over 240 circular degrees to provide reading accuracy to within ±0.5 divisions.

A threaded mounting knob at the top of each durometer permits permanent test stand emplacement. An ancillary pointer will register the highest durometer reading against all vibrations met in normal use. Each durometer comes complete with carrying case and test

Model 306L - "A" Scale Durometer measures the penetration hardness of rubber, elastomers, and other rubber-like substances such as neoprene, silicone, vinyl and butyl. It can also be used for soft plastics, felt leather and similar materials.

Model 307L - "D" Scale Durometer is designed for hard plastics - polystyrenes, vinyls, Formica, Plexiglas - hard rubbers and phenolic molded materials.

Model 302SL Foam and Sponge Rubber Durometer measures the hardness of soft materials such as foam rubber, sponge rubber, jells and doughs. It classifies cellular rubbers of the sponge and foam type as "x-soft", "soft", "medium" and "firm", and then further divides these ranges into smaller increments so that much closer and accurate tolerances can be established. This instrument can perform comparative hardness tests without the cost of using an indentation load deflection (ILD) test machine. Model 302SL offers a cost-effective means of checking foam or sponge rubber with speed, portability and accuracy. Values of the 302SL scale are based on the force of a variable load over an area of one square centimeter. When making hand-held tests, the gauge is simply placed on the material to be checked. No external force is needed, the weight of the instrument itself is sufficient to bring the base of the gauge flush with the material's surface. When using with a test stand, the material and the stage are lifted up to the durometer until the load cell of the stand separates. The resettable ancillary hand records the peak reading.