Table 3. Comparison of the Maximum Puncture Resistance Force (N/mm) of the NGP-Blended NBR and Pure NBR.

	n	1	2	3	mean	STD
NGP-blended NBR	4	37.7	37.42	35.91	36.48	1.38
Pure NBR	4	42.12	42.44	40.16	42.16	1.54