Hardnesstester BARCOL

BARCOL hardness measurement is based on two standards: ASTM B648 and ASTM D2583.

ASTM B648 describes the use of the BARCOL 934-1 durometer for measuring the hardness of aluminum.
ASTM D2583 describes the use of the BARCOL 934-1 & 935 durometers for measuring the hardness of rigid plastics.

Note: model 936 is not currently covered by any standard.

By using different indenters and loading springs, it is possible to switch from one model to the other:

models 934-1 and 935 use the same indenters.
models 935 & 936 use the same springs.
all three models use the same indicator.

Note: the standards provide the specifications for the indenter for the 934-1 and 935 and for the indicator, but do not specify the measuring force/pressure for the various models. => reduced possibility of verifying the durometer using the direct method.

ASTM D2583 recommends

if the hardness measurement with a 934-1 is less than 20, a 935 should be used.
the 935's measuring range should be between 90 and 10.
and it can be assumed that for values measured with the 935 close to 10, a 936 should be used.

The indenters and display comparator can be changed by users.

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Hardnesstester BARCOL