Open timbrisc opened 3 years ago
Additional information provided by Bell Hess.
We recommend the addition of the following UCUM codes to represent measurements on the three different Shore scales:
[Shore_A_scale] [Shore_D_scale] [Shore_OO_scale]
I believe that the UCUM convention for dimensionless units of measure is to enclose the code in square brackets, as in the above. This is Shore process for measuring hardness: Shore hardness is tested with an instrument called Durometer. Durometer utilizes an indenter loaded by a calibrated spring. The measured hardness is determined by the penetration depth of the indenter under the load.
Two different indenter shapes (see the picture below) and two different spring loads are used for two Shore scales (A and D). The loading forces of Shore A: 1.812 lb (822 g), Shore D: 10 lb (4536 g).
Trac does not allow embedded images) Link to graphic referenced above: [http://www.substech.com/dokuwiki/lib/exe/detail.php?id=shore_durometer_hardness_test&cache=cache&media=durometer.png]
Shore hardness value may vary in the range from 0 to 100. Maximum penetration for each scale is 0.097-0.1 inch (2.5-2.54 mm). This value corresponds to minimum Shore hardness: 0. Maximum hardness value 100 corresponds to zero penetration.
What is being measured is the amount of indenter penetration on a scale of 0 to 100 where 0 # no indenter penetration and 1000.1 inch indenter penetration. A Shore measurement of 50 would therefore be 0.05 inch indenter penetration. The size and shape of the indenter is what distinguishes Shore A measurements from Shore D measurements.
Issue migrated from trac ticket # 5783
component: support material | priority: critical | keywords: Shore Hardness Scale
2021-01-16 18:03:24: william.hess@fda.hhs.gov created the issue