Portable Shore Durometer Hardness Tester For Testing Homogeneous
Materials
Introduction
Portable:The Impressor is a convenient tool for testing the hardness of
aluminum, aluminum alloys, copper, brass and other materials
including plastics and fiberglass. The instrument is designed for
use on fabricated parts and assemblies as well as on raw stock.
The impressor weighs only 1 lb. 2 oz. and comes complete with
carrying case, adjusting wrench and two spare indenter points, 2
lb. 8oz.
Applications:
BHT barber hardness tester for soft metals such as aluminum and its alloys, brass, copper,
and some of the harder plastics and fiberglass. Approximate range
25 to 150 Brinell (10 mm ball 500 kg load). This unit meets
Standard D2583.Corrosion Control Products Company will be glad to
recommend the most suitable model upon receipt of sample materials.
Operating Information:
The Impressor is best suited for testing homogeneous materials.
Materials of granular, fibrous or coarse structure will produce a
wide variation in hardness readings because of the small diameter
of the indenter point.
For accurate readings, material should be at least 1 /32"thick and
large enough for a minimum distance of 1/8" in any direction from
the indenter point to the edge of the specimen. The testing area
should be smooth and free from mechanical damage.
Simply exert alight pressure against the instrument to drive the
spring-loaded indenter point into the material. The indenter point
must be perpendicular to the surface being tested.
On very soft metals, the highest reading should be used since cold
flow permits the spring loaded indenter point to continue
penetration.
Note: Physical characteristics of very soft materials are such that
uniform correlation between different hardness measuring systems
cannot be established.We recommend that Impressor hardness limits
for each material be established by test.
Recommended Sample Sizes
| Hardness Scale | Reading Variance | Number of Readings | Variance of Average |
Homogeneous Material | 20
30
40
50
60
70
80 | 2.47
2.20
1.93
1.66
1.39
1.12
0.85 | 9
8
7
6
5
4
3 | 0.27
0.28
0.27
0.28
0.28
0.28
0.28 |
Reinforced Plastics | 30
40
50
60
70 | 22.4
17.2
12.0
7.8
3.6 | 29
22
16
10
5 | 0.77
0.78
0.75
0.78
0.75 |
