The Barcol #934-1 impresser is the industry standard hardness tester for checking the hardness of softer metals and hard plastics in the field. Typical applications include brasses, light alloys, GRP and epoxy composites.
As a guide, optimally cured polyester layup or gelcoat resins should give Barcol Hardness readings of approximately 40 ~ 42 at 20 °C. (See manufacturer's data sheets for specific information.) Under-cured resins provide lower mechanical strength than optimally cured examples and are more likely to distort at elevated temperatures. Moisture absorption will also be higher.
Where Barcol Hardness figures are quoted in reports without a model number it is usually safe to assume that a #934-1 Impresser was used.
Kit includes the Barcol Impresser, two spare indenter points, test disks, wrench and detachable foot all housed in a foam lined carry case. The photographs show one of our used #935-1 impressers but the #934-1 is outwardly identical and it seemed a shame to break the seal on a new one.
See details of the Barcol #935 and #936 impressers for use on softer materials.
© Nigel Clegg Associates, Hardwick Road, Sedgefield, County Durham, TS21 2AL