Marmonix MTS-B-D3 3-Piece Shore D Durometer Test Blocks

The Marmonix MTS-B-D3 Shore D test block set is a three-piece hard rubber/plastic reference kit at 40, 60 and 80 Shore D, stated ±1 Shore D, for checking that a Shore D durometer still reads correctly across the rigid-plastics and hard-rubber range. It suits standard Shore D instruments of any brand and is used from 0 °C to +40 °C with dry room-temperature storage. Browse all Marmonix hardness testers, pair it with the MDS-100D Shore D durometer, or see the Shore A sibling MTS-B-A7 7-piece Shore A blocks.

The MarMonix MTS-B-D3 is a professional-grade calibration verification kit designed to ensure the ongoing accuracy and reliability of your Shore D hardness testing equipment. Essential for quality control managers, lab technicians, and production supervisors, this set provides a trusted method to validate durometer readings against known hardness values, preventing measurement drift and ensuring compliance with rigorous industrial testing standards.

This comprehensive kit features three distinct test blocks representing the low, medium, and high ranges of the Shore D scale: 40, 60, and 80 Shore D. Each block is precision-engineered from high-quality hard rubber and plastic compounds to deliver consistent, repeatable results year after year. The blocks feature a smooth, uniform surface finish that minimizes friction and reading errors during critical calibration checks.

Whether used for daily production line audits, incoming material inspection, or operator training, the MTS-B-D3 offers universal compatibility with all Shore D durometers, regardless of the manufacturer. The entire set is housed in a durable, custom-fitted storage case, protecting the blocks from contaminants and making it easy to transport for on-site inspections or field verification.

MTS-B-D3 Technical Specifications

How Shore D test blocks are used to check durometers

In a typical plastics or hard-rubber QC lab, several operators share Shore D durometers, and a few points of drift can pass or fail a rigid moulding, resin casting or hard elastomer part.

Durometer hardness of rubber and some plastics is defined in ASTM D2240 and ISO 48-4; the D scale covers the high-hardness range. Reference blocks with known Shore D values give a quick check between formal instrument verifications: the operator presses the durometer onto a block, compares the reading with the marked value, and treats a difference outside the lab tolerance as a sign the instrument needs attention. Test-block makers note that blocks are a reference check and do not replace a full verification of the durometer.

Checking low, mid and high values (rather than one block) shows whether an error stays flat or grows toward either end of the scale. Keep the set dry at room temperature.

Questions about the MTS-B-D3 Shore D test blocks

Which instruments can I check with the MTS-B-D3?

The MTS-B-D3 is for standard Shore D durometers of any brand used on hard rubber and rigid plastics. Soft rubber and elastomers on the Shore A scale need a Shore A block set instead.

What hardness values are in the MTS-B-D3 set?

The MTS-B-D3 holds three blocks at 40, 60 and 80 Shore D with a stated accuracy of ±1 Shore D, made from a hard rubber/plastic compound with a smooth, uniform surface.

How do I use the MTS-B-D3 blocks?

Press the durometer foot fully onto each block on a flat, firm surface and compare the reading with the block value; check all three to see whether an error changes across the range. Use the set between 0 °C and +40 °C and store it dry at room temperature.