Gardco :: Barcol Hardness Impressor

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, preloading or separate measurements.
Lightweight - The Impressor weighs only 1 lb. 2 oz. and comes complete with carrying case, adjusting wrench and two spare indenters.
The Impressor is best suited for testing homogeneous materials. Material of granular, fibrous or coarse structure will produce a wide variation in hardness readings because of the small diameter of the indenter point.
Applications: Fiberglass, Aluminum, Aluminum Alloys, Soft Metals, Plastics

Technical Data
Three Models Available
GYZJ 934-1	Use this model for fiberglass, soft metals such as aluminum and its alloys, brass, copper, and some of the harder plastics and fiberglass. Approximated range 25 to 150 Brinell (10mm ball 500 KG load). This unit meets American Society for Testing and Material (ASTM) Standard D-2583.
GYZJ 935	Use this Model for the softer plastics and very soft metals. Approximate range 50 to 110 Rockwell "R".
GYZJ 936	Use this Model for extremely soft materials such as lead, linoleum and leather.

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 into the material.
The indenter must be perpendicular to the surface being tested.
On very soft metal, the highest reading should be used since cold flow permits the spring-loaded indenter to continue penetration. 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.


Approx. Conversion Curves for GYZJ934-1	Approx. Conversions Curve for GYZJ 935 & 936

Approximate Conversion Chart for GYZJ934-1
GYZJ-934-1	Brinell	Vickers	Webster	Rockwell	Rockwell	Rockwell	Rockwell
GYZJ-934-1	10mm 500kg	5kg	Model B	B	E	F	H
35		21					32
36		22					35
37		23					37
38		24					40
39		25					42
40	25	26					45
41	26	27					47
42	26	28					49
43	27	29					51
44	27	30					54
45	27	30					56
46	28	31					58
47	29	32			23		60
48	30	33	0.7		26		62
49	31	34	1.3		28		64
50	32	35	1.9		31		66
51	33	36	2.5		34		68
52	34	38	3.1		38		70
53	35	39	3.6		39	30	72
54	37	40	4.2		41	34	73
55	38	41	4.7		44	37	75
56	39	43	5.3		46	40	77
57	40	44	5.8		48	43	78
58	42	45	6.3		50	46	80
59	44	47	6.8		53	48	82
60	45	49	7.3		55	51	83
61	47	50	7.6		57	54	85
62	48	52	8.3		59	56	86
63	50	54	8.8		61	59	88
64	52	56	9.2		63	61	89
65	54	58	9.7		65	63	90
66	55	60	10.1		67	66	92
67	58	62	10.8		69	68	93
68	60	65	11.0		71	70	94
69	62	67	11.4		73	72	95
70	64	70	11.8	17	75	74	97
71	67	72	12.2	23	76	75	98
72	69	75	12.6	28	78	77	99
73	71	78	12.9	33	80	79	100
74	73	81	13.3	38	81	80	101
75	76	85	13.7	42	83	82	102
76	80	88	14.0	47	84	83	103
77	84	92	14.3	51	86	85	104
78	87	95	14.7	55	87	86	105
79	90	99	15.0	59	88	88	106
80	94	103	15.3	63	90	89	106
81	97	108	15.6	66	91	90	107
82	100	112	15.9	70	92	91	108
83	105	117	16.2	73	94	92	109
84	109	121	16.4	76	95	93	109
85	113	126	16.7	79	96	94	110
86	117	131	16.9	81	97	95	111
87	122	137	17.2	84	98	96	111
88	126	142	17.4	86	99	97	112
89	131		17.6	88	100	98	112
90	135		17.8	90	101	98	113
91	139		18.0		102	99	114
92	145		18.2		103	100
93			18.4		103	101
94			18.6		104	101
95			18.7		105	102
96			18.9		106	102
97			19.0		106	103
98			19.2		107
99			19.3		107
100			19.4		108

Approximate Conversion Chart for GYZJ-935 & GYZJ-936
Type D Durometer	GYZJ-935	GYZJ-936
52		6
53		9
54		12
55		15
56		18
57		21
58		24
59		27
60		30
61		32
62		35
63		38
64		40
65		43
66		45
67		48
68	22	50
69	28	52
70	30	54
71	34	57
72	38	59
73	41	61
74	45	63
75	48	65
76	51	67
77	54	69
78	57	70
79	60	72
80	63	74
81	68	76
82	69	77
83	71	79
84	74	80
85	78	82
86	79	83
87	81	85
88	83	88
89	85	87
90	87	88

Barcol Impressor Hardness Tester