PTC Classic-Style Durometer

The CLASSIC-STYLE DUROMETER by PTC Instruments measures material hardness using the Shore hardness scale. Hardness of plastics and rubbers, including coatings and linings, is generally measured using a Durometer, with the Shore A scale used for the softest materials and the Shore D for the harder materials.

PTC Durometers feature a low-glare, serialized dial with bold, easy-to-read numbers, and comeswith a Max Hold hand which holds peak hardness reading until reset. PTC Durometers are portable and durable enough for field or laboratory material testing. Conformable to ASTM D2240* and ISO 868 standards for testing material hardness for rubbers and plastics, the Classic-style PTC Durometer can be used as a hand-held tester, with a test stand, or with a constant load weight.

PTC Instruments manufactures and calibrates durometers to ISO 17025 standards. All PTC Durometers come with a hardness test block and carrying case.


PTC Durometer Classic comes in the following scales:

  • PTC 306L       ASTM Type A -  softest substances: rubbers, elastomers
  • PTC 306L.5             Type A,   Half-Point accuracy (A2LA/NIST certificate included with this model)
  • PTC 306RL              Type A    Racing Tire Classic Durometer
  • PTC 306BL     ASTM Type B  - moderately hard rubbers
  • PTC 307CL     ASTM Type C -  medium hard rubbers, soft plastics
  • PTC 307L                Type D -  hard plastics & rubbers
  • PTC 412             Type OOO    very soft materials (open cell foams, sponge rubber, gel-like materiasl)
  • PTC 302SL             Type SL -  foam & sponge rubber


Optional NIST-traceable certificate available with all durometers.

Click to view chart of Durometer Types


* ASTM D2240 Standard Test Method for Rubber Property—Durometer Hardness

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