Table 8. Test Result of Mixed Compound With NBR2255 and KNB25LM. (ACN 23.8%)

Property		T-16	T-17	T-18	T-19	T-20	T-21
Hardness(shore A)		69	67	66	65	64	63
Tensile strength(Mpa)		11.5	13.1	12.1	13.9	10.9	13.6
Elongation(%)		270	300	305	350	290	380
Compression set(%)		+27	+28	+28	+29	+28	+29
Ozone-resistance(50pphm, 40°C, 3day)		No Crack	No Crack	No Crack	No Crack	No Crack	No Crack
Low temperature resistance(TR-10)		−47.9	−44.6	−48.9	−50.5	−51.9	−52.6
Heat resistance (120°C, 70hr)	Hardness change(%)	+8	+9	+9	+10	+10	+11
	Tensile strength change(%)	+15.7	+18.3	+33.1	+14.4	+46.8	+33.8
	Elongation change(%)	−40.7	−33.3	−31.1	−35.7	−24.1	−36.8
Oil resistance (ASTM IRM 901, 120°C, 70hr)	Hardness change(%)	+2	+3	+4	+5	+4	+5
	Tensile strength change(%)	+23.5	+13.0	+28.1	+0.4	+21.1	+17.6
	Volume change(%)	−2.9	−4.7	−5.6	−9.5	−7.5	−7.9
Oil resistance (ASTM IRM 903, 120°C, 70hr)	Hardness change(%)	−8	−7	−7	−6	−6	−5
	Tensile strength change(%)	+5.2	−9.2	+1.7	−5.0	−5.7	−8.6
	Volume change(%)	+18.2	+18.0	+16.7	+15.5	+13.4	+14.2