The Impressor
The Barcol Impressor
Hand-Held Portable Hardness Tester
Aluminum
Aluminum Alloys
Soft Metals
Plastics
Fiberglass
Controllers
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•
•
•
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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.
Easy to Use
No experience required; can be used in any position and in any space that will allow for
the operator’s hand. The hardness reading is instantly indicated on the dial, which is divided
into one hundred graduations. No waiting, pre-loading or separate measurements.
Lightweight
The impressor weighs only 1 lb. 2 oz. and comes complete with carrying case, adjusting
wrench and two spare indenter points, 2 Ib. 8oz.
Applications
Four Models Available
GYZJ 934-1 for soft metals such as aluminum and its alloys, brass, copper, and some of
the harder plastics and fiberglass. Approximate range 25 to 150 BrineIl (10 mm ball 500
kg load). This unit meets American Society for Testing and Materials (ASTM) Standard D2583.
GYZJ 934-1-0-1 for ladder testing. Compliant with NFPA 1932, National Fire Protection
Association – 1994 Edition; ASTM B648-76, American Society for Testing and Materials – 1984
edition.
GYZJ 935 for the softer plastics and very soft metals.
GYZJ 936 for extremely soft materials such as lead, linoleum and leather.
Barber-Colman engineers 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 a light 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 springloaded indenter point to continue penetration.
1250-DB-100-0-01
Barber-Colman Company, Loves Park, IL
309
The Impressor
Note:
Physical characteristics of very soft materials are such that uniform correlation between
different hardness measuring systems cannot be established. For this reason, no conversion
curves are offered for the 935 and 936 models. We recommend that impressor hardness
limits for each material be established by test.
Recommended Sample Sizes
To equalize the variance of the average (GYZJ 934-1)
Homogeneous Material:
Hardness Scale
20
30
40
50
60
70
80
Reinforced Plastics:
30
40
50
60
70
Reading Variance Number of Readings Variance of Average
2.47
9
0.27
2.20
8
0.28
1.93
7
0.27
1.66
6
0.28
1.39
5
0.28
1.12
4
0.28
0.85
3
0.28
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
Typical Readings of Aluminum Alloys
5052-0 5052H14 6061T6 2024T3
62
75
80
85
140
130
120
Vic
ker
s
ine
ll
Approximate Conversion Curves
for GYZJ 934-1
1100-0 3003-0 3003H14 2024-0
35
42
56
60
Rockwell "B" (1/16" ball 100 kg load)
Rockwell "E" (1/8" ball 100 kg load)
Rockwell "F" (1/16" ball 60 kg load)
Brinnell
(10 mm ball 500 kg load)
Vickers Pyramid Numbers
Br
Alloy and Temper:
GYZJ 934-1 reading:
Rockwell "H"
"
ll "E
kwe F"
c
o
"
R
ell
ckw
o
R
"B
"
100
ck
we
ll
90
Ro
Controllers
Operating Information (continued)
80
70
60
50
40
30
20
40
310
50
60
Barber-Colman Company, Loves Park, IL
70
80
90
1250-DB-100-0-01
The Impressor
934-1 Brinnell Vickers
Approximate Conversion Chart
for GYZJ 934-1
B
Rockwell
E
F
H
934-1 Brinnell Vickers
35
23
32
68
60
64
36
37
38
39
40
41
42
43
44
45
46
47
48
25
26
26
27
27
27
28
29
30
23
24
24
25
25
26
27
27
28
20
30
32
33
24
25
33
37
40
43
45
47
49
52
54
56
58
61
63
69
70
71
72
73
74
75
76
77
78
89
80
81
62
64
67
69
71
73
76
80
84
87
90
94
97
67
69
72
74
76
81
85
88
92
95
99
103
108
49
50
51
52
53
54
55
56
57
58
59
60
61
31
32
33
34
35
37
38
39
40
42
44
45
47
34
35
36
38
39
41
42
44
45
47
48
49
51
28
30
33
36
39
42
44
46
48
51
53
55
57
29
33
38
40
43
47
49
51
54
64
66
68
70
72
73
75
76
78
80
81
83
84
82
83
84
85
86
87
88
89
90
91
92
93
94
100
105
109
113
117
122
126
131
135
139
145
111
116
122
127
133
137
142
144
62
63
64
64
66
67
48
50
52
54
55
58
53
55
57
58
60
62
59
62
64
65
67
69
56
58
61
63
65
67
86
88
89
90
91
92
95
96
97
98
99
100
Approximate Conversion Chart GYZJ-935 and GYZJ-936
Type D Durameter
GYZJ-935
& 936
GYZJ-935 GYZJ-936
4
64
52
6
8
65
53
10
12
66
54
14
16
55
67
18
56
20
22
68
57
24
58
26
69
28
59
1250-DB-100-0-01
Type D Durameter
GYZJ-935
& 936
GYZJ-935 GYZJ-936
30
70
60
32
34
61
71
36
62
38
40
42
44
46
48
50
52
54
56
72
63
73
64
74
75
76
77
65
66
67
68
69
70
71
Barber-Colman Company, Loves Park, IL
Rockwell
E
F
H
71
69
94
73
74
76
77
79
81
83
84
86
88
89
90
91
71
73
75
77
79
81
83
84
86
87
88
89
90
95
96
98
99
100
101
102
103
104
105
106
107
108
92
94
95
96
97
98
99
100
101
102
103
103
104
91
92
93
94
95
96
97
97
98
99
100
101
101
108
109
109
110
111
111
112
112
113
113
104
105
106
107
108
108
102
102
103
B
18
19
28
33
39
45
48
52
56
60
63
65
69
72
75
77
80
83
86
89
91
Type D Durameter
GYZJ-935
& 936
GYZJ-935 GYZJ-936
58
78
72
60
62
64
66
68
70
72
74
76
78
79
80
81
82
83
84
85
73
74
75
76
77
78
79
80
81
83
80
82
84
86
87
88
84
85
86
86
88
89
n/a
87
89
311
Controllers
Operating Information (continued)
The Impressor
Ordering Information
Controllers
Hardness Tester
Model
GYZJ-934-1
GYZJ-934-1-0-1
GYZJ-935
GYZJ-936
Range
25 to 50 Brinell (10 mm ball 500 kg load)
For ladder testing (NFTA and ASTM compliant)
For softer plastic and very soft metals
For extremely soft material
Part No.
GYZJ-069-100
GYZJ-070-100
GYZJ-078-100
GYZJ-250-100
GYZJ-069
GYZJ-070
GYZJ-078
GYZJ-250
Set of
Set of
Set of
Set of
Each
Each
Each
Each
Certified Test Disks
Non-certified Test Disks
5
5
5
5
Use with Model
GYZJ-935
GYZJ-936
GYZJ-934-1
GYZJ-934-1
GYZJ-935
GYZJ-936
GYZJ-934-1
GYZJ-934-1
Barber-Colman Scale
87 – 89
48 – 50
43 – 48
87/89
87 – 89
48 – 50
43 – 48
87/89
The Impressor Repair Parts
Item
GYZJ-934-1
GYZJ-935
GYZJ-936
1
AYRS-62
AYRS-62
AYRS-62
2
BYRF-3114
BYRF-3114
BYRF-3114
3
BYRF-250
BYRF-250
BYRF-250
4
GYZJ-2
GYZJ-2
GYZJ-2
5
GYZJ-3
AYRS-146-1
AYRS-146-1
6
GYZJ-4-1
GYZJ-4-1
GYZJ-4-1
7
GYZJ-6-5
GYZJ-6-5
GYZJ-67
8
GYZJ-7
GYZJ-7
GYZJ-7
9
GYZJ-8
GYZJ-8
GYZJ-8
10
DYRA-218
DYRA-218
DYRA-218
11
GYZJ-15-2
GYZJ-15-2
GYZJ-15-2
12
GYZJ-16
GYZJ-16
GYZJ-16
GYZJ-17-1
GYZJ-17-1
GYZJ-17-1
GYZJ-19-2
GYZJ-19-2
GYZJ-19-2
13
GYZJ-23-1
GYZJ-23-1
GYZJ-23-1
14
GYZJ-61
GYZJ-61
GYZJ-61
15
GYZJ-62
GYZJ-62
GYZJ-62
16
GYZJ-63
GYZJ-63
GYZJ-63
17
GYZJ-64
GYZJ-64
GYZJ-71
18
GYZJ-65
GYZJ-65
GYZJ-65
18
GYZJ-65-4
For Model GYZJ-934-1-0-1 only
19
GYZJ-79-1
GYZJ-79-2
GYZJ-79-3
† Parts required to convert between models.
312
Description
Spring
Cover Screw
Frame Screw
Plunger Upper Guide Nut
Spring†
Plunger
Indenter Point†
Lever
Pin
Pin
Indicator (not field servicable)
Lock Nut
Wrench
Carrying Case
Case & Frame Assembly
Stop Ring
Point Sleeve
Spring Sleeve
Lower Plunger Guide†
Leg
Leg
Label†
Barber-Colman Company, Loves Park, IL
Qty
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1250-DB-100-0-01