Injection Molding: Hardness of Mold Material

To create perfect molds, it is important to select suitable material, molds are constructed by materials which are impact resistance, abrasion resistance, with high strength and nice mechanical behavior, and they are not easy to crack or out of shape.

Depends on mold structure, injection molding process, and requirement of finished plastic article, we should select different material with different hardness.

Below please see conversion table of mold material hardness, for mobile phone user, please swipe to the right to view the whole information:

Vickers Hardness(HV)	Brinell Hardness(HB) 10m/m 3000kg	Rockwell Hardness (HR)			Shore Hardness(HS)	Tensile Strength (kg/mm²)
Vickers Hardness(HV)	Brinell Hardness(HB) 10m/m 3000kg	Grade A	Grade B	Grade C	Shore Hardness(HS)	Tensile Strength (kg/mm²)
940	-	85.6	-	68.0	97	-
920	-	85.3	-	67.5	96	-
900	-	85.0	-	67.0	95	-
880	-	84.7	-	66.4	93	-
860	-	84.4	-	65.9	92	-
840	-	84.1	-	65.3	91	-
820	-	83.8	-	64.7	90	-
800	-	83.4	-	64.0	88	-
780	-	83.0	-	63.3	87	-
760	-	82.6	-	62.5	86	-
740	-	82.2	-	61.8	84	-
720	-	81.8	-	61.0	83	-
700	-	81.3	-	60.1	81	-
690	-	81.1	-	59.7	-	-
680	-	80.8	-	59.2	80	231
670	-	80.6	-	58.8	-	228
660	-	80.3	-	58.3	79	224
650	-	80.0	-	57.8	-	221
640	-	79.8	-	57.3	77	217
630	-	79.5	-	56.8	-	214
620	-	79.2	-	56.3	75	210
610	-	78.9	-	55.7	-	207
600	-	78.6	-	55.2	74	203
590	-	78.4	-	54.7	-	200
580	-	78.0	-	54.1	72	196
570	-	77.8	-	53.6	-	193
560	-	77.4	-	53.0	71	189
550	505	77.0	-	52.3	-	186
540	496	76.7	-	51.7	69	183
530	488	76.4	-	51.1	-	179
520	480	76.1	-	50.5	67	176
510	473	75.7	-	49.8	-	173
500	465	75.3	-	49.1	66	169
490	456	74.9	-	48.4	-	165
480	448	74.5	-	47.7	64	162
470	441	74.1	-	46.9	-	157
460	433	73.6	-	46.1	62	155
450	425	73.3	-	45.3	-	150
440	415	72.8	-	44.5	59	148
430	405	72.3	-	43.6	-	143
420	397	71.8	-	42.7	57	141
410	388	71.4	-	41.8	-	137
400	379	70.8	-	40.8	55	134
390	369	70.3	-	39.8	-	130
380	360	69.8	-	38.8	52	127
370	350	69.2	(110.0)	37.7	-	123
360	341	68.7	(109.0)	36.6	50	120
350	331	68.1	-	35.5	-	117
340	322	67.6	(108.0)	34.4	47	113
330	313	67.0	-	33.3	-	110
320	303	66.4	(107.0)	32.2	45	106
310	294	65.8	-	31.0	-	103
300	284	65.2	(105.5)	29.8	42	99
295	280	64.8	-	29.2	-	98
290	275	64.5	(104.5)	28.5	41	96
285	270	64.2	-	27.8	-	94
280	265	63.8	(103.5)	27.1	40	92
275	261	63.5	-	26.4	-	91
270	256	63.1	(102.0)	25.6	38	89
265	252	62.7	-	24.8	-	87
260	247	62.4	(101.0)	24.0	37	85
255	243	62.0	-	23.1	-	84
250	238	61.6	99.5	22.2	36	82
245	233	61.2	-	21.3	-	80
240	228	60.7	98.1	20.3	34	78
230	219	-	96.7	(18.0)	33	75
220	209	-	95.0	(15.7)	32	71
210	200	-	93.4	(13.4)	30	68
200	190	-	91.5	(11.0)	29	65
190	181	-	89.5	(8.5)	28	62
180	171	-	87.1	(6.0)	26	59
170	162	-	85.0	(3.0)	25	56
160	152	-	81.7	(0.0)	24	53
150	143	-	78.7	-	22	50
140	133	-	75.0	-	21	46
130	124	-	71.2	-	20	44
120	114	-	66.7	-	-	40
110	105	-	62.3	-	-	-
100	95	-	56.2	-	-	-
95	90	-	52.0	-	-	-
90	85	-	48.0	-	-	-
85	81	-	41.0	-	-	-

Remarks: 1. Sources from JIS Hardness Conversion Table 2. The values stated in parentheses are for information only, which are beyond normal range of use.

**Ji-Horng Plastic is a leading plastic injection molding manufacturer since 1986, for more information, please contact us!**

E-mail: ji093843@ms7.hinet.net