Pencil Hardness Gauge
The Micro-Metrics Pencil Hardness Gauge is practical for use in the laboratory, on the production line, or in the field to assess quantitatively the rigidity or firmness (elastic modulus) of organic coatings applied to rigid substrates such as metal. Hardness values may define requirements for particular coatings applications or may be used to evaluate state-of-cure or aging of coating.
The Micro-Metrics Pencil Hardness Gauge is unique in that it provides a compact single unit for performing this test, rather than a set of easily lost individual pencils. The importance of this advantage is especially apparent when several individuals are working with a single instrument. The H-501 now has metal-barrel lead holders.
New replacement sandpaper disk kit!
Micro-Metrics is pleased to announce you can now purchase kit H-501-20R, a set of five replacement sandpaper adhesive disks for squaring-off your leads. These disk attached to the plastic dressing disk that comes with your H-501 Pencil Hardness Gauge.
When two materials of different degrees of hardness of rigidity are forced against each other, one of the materials either yields or crumbles, while the other is unaffected. Thus a scale of relative hardness can be established on the basis of the ability of one material to scratch or deform another. This principle has long been used in the mineralogy field where it is known as the Mohs Hardness Scale (F. Mohs, 1820). Thus, the hardest material, diamond, is arbitrarily given a hardness value of 10, and other materials range downward through, for example, Corundum–9, Quartz–7, Apatite–5, Calcite–3, and Talc–1.
Mechanical drawing pencil leads of available grades cover a range of useful organic coatings. The crumbling mode of failure is also an essential characteristic of the drawing leads, which is necessary for this application.
The Micro-Metrics Pencil Hardness Gauge design allows the user to force pencil leads of increasing hardness values against a coated surface in a precisely defined manner until one lead mars the surface. Surface hardness is defined by the hardest pencil grade that fails to mar the painted or coated surface.
The leadset supplied with the Micro-Metrics Pencil Hardness Gauge contains the following leads, listed from softest to hardest:
6B, 5B, 4B, 3B, 2B, B, HB, F, H, 2H, 3H, 4H, 5H, 6H
The leads are supplied in a carrying case that identifies each lead (note that individual leads often come without identification or the identification mark may be difficult to read). Choosing and installing the eight leads most commonly used will allow the leads most appropriate to the surface(s) being tested to be always at the ready.
Five disks of high-quality paper mounted on a plastic dressing disk are provided to facilitate dressing the lead points while they are in place in the gage. Replacement sandpaper disk kits (five disks) are now available.
The H-501 Pencil Hardness Gauge comes complete with testing device, fourteen leads in a carrying case, a dressing disk, and a vinyl carrying case.
The Technical Data Sheet for the H-501 Pencil Hardness Gauge is now available on this site, in a form that can be printed on 8-1/2" by 11" paper.
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