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Introduction
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Portable
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The
Impressor is a convenient tool for testing the
hardness of aluminum,
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aluminum
alloys, copper, brass and other materials including plastics and
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fiberglass. The instrument
is designed for use on fabricated parts and
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assemblies as well as on raw
stock.
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Easy to Use
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No experience required; can be used in any position and in any
space that will
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allow for
the operators hand. The hardness reading is instantly indicated on
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the
dial, which is divided into one hundred graduations. No waiting,
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pre-loading or
separate measurements.
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Lightweight
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The
impressor weighs only 1 lb. 2 oz. and comes
complete with carrying case,
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adjusting wrench and two
spare indenter points, 2 lb. 8 oz.
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Applications
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Three
Models
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GYZJ 934-1 for soft metals such as aluminum and its alloys,
brass, copper,
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Available
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And
some of the harder plastics and fiberglass. Approximate range 25 to 150
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Brinell (10 mm ball 500
kg load). This unit meets American Society for
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Testing
and Materials (ASTM) Standard D-2583.
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GYZJ
935
for the softer plastics and very soft metals.
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GYZJ
936
for extremely soft materials such as lead, linoleum and leather.
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Corrosion
Control Products Company will be glad to recommend the most
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suitable model upon
receipt of sample materials.
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Operating Information
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The
Impressor is best suited for testing homogeneous
materials. Materials of granular,
fibrous or
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coarse
structure will produce a wide variation in hardness readings because of the
small diameter
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of the indenter point.
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For accurate readings, material should be at least 1-32 thick
and large enough for a minimum
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distance of
1/8 in any direction from the indenter point to the edge of the specimen.
The testing
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area
should be smooth and free from mechanical damage.
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Simply
exert alight pressure against the instrument to drive the spring-loaded
indenter point into the
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material. The indenter
point must be perpendicular to the surface being tested.
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On very soft metals, the highest reading should be used since
cold flow permits the spring loaded
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indenter
point to continue penetration.
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Recommended Sample Sizes
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Material
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Hardness Scale
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Reading Variance
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Number of Readings
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Variance of
Average
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Homogeneous
Material
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20
30
40
50
60
70
80
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2.47
2.20
1.93
1.66
1.39
1.12
0.85
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9
8
7
6
5
4
3
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0.27
0.28
0.27
0.28
0.28
0.28
0.28
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Reinforced
Plastics
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30
40
50
60
70
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22.4
17.2
12.0
7.8
3.6
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29
22
16
10
5
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0.77
0.78
0.75
0.78
0.75
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