Table 1 Physical properties of NR and CR... | Emerald Publishing

Table 1

Physical properties of NR and CR^a

Test items		Test results
Test items		NR	CR
Shore A hardness	RT	45	47
Shore A hardness	−40 °C	58	80
Tensile strength/MPa	RT	16.41 ± 0.42	14.67 ± 0.35
Tensile strength/MPa	−40 °C	19.32 ± 0.47	15.07 ± 0.36
Tensile stress at 100% elongation/MPa	RT	0.58 ± 0.04	0.94 ± 0.06
Tensile stress at 100% elongation/MPa	−40 °C	0.84 ± 0.06	1.76 ± 0.07
Tensile stress at 200% elongation/MPa	RT	0.84 ± 0.05	1.53 ± 0.09
Tensile stress at 200% elongation/MPa	−40 °C	2.15 ± 0.12	4.83 ± 0.16
Tensile stress at 300% elongation/MPa	RT	1.12 ± 0.07	2.75 ± 0.14
Tensile stress at 300% elongation/MPa	−40 °C	4.43 ± 0.15	9.63 ± 0.20
Elongation at break	RT	1146% ± 52%	823% ± 40%
Elongation at break	−40 °C	593% ± 29%	449% ± 21%
Coefficient of cold resistance under compression (−40 °C, compression rate 20%)		0.66	0.56
Low-temperature brittleness		−40 °C undamaged	−40 °C undamaged
Flex cracking and crack growth/times		1.4 × 10⁵	5.0 × 10⁵

Test items		Test results
Test items		NR	CR
Shore A hardness	RT	45	47
Shore A hardness	−40 °C	58	80
Tensile strength/MPa	RT	16.41 ± 0.42	14.67 ± 0.35
Tensile strength/MPa	−40 °C	19.32 ± 0.47	15.07 ± 0.36
Tensile stress at 100% elongation/MPa	RT	0.58 ± 0.04	0.94 ± 0.06
Tensile stress at 100% elongation/MPa	−40 °C	0.84 ± 0.06	1.76 ± 0.07
Tensile stress at 200% elongation/MPa	RT	0.84 ± 0.05	1.53 ± 0.09
Tensile stress at 200% elongation/MPa	−40 °C	2.15 ± 0.12	4.83 ± 0.16
Tensile stress at 300% elongation/MPa	RT	1.12 ± 0.07	2.75 ± 0.14
Tensile stress at 300% elongation/MPa	−40 °C	4.43 ± 0.15	9.63 ± 0.20
Elongation at break	RT	1146% ± 52%	823% ± 40%
Elongation at break	−40 °C	593% ± 29%	449% ± 21%
Coefficient of cold resistance under compression (−40 °C, compression rate 20%)		0.66	0.56
Low-temperature brittleness		−40 °C undamaged	−40 °C undamaged
Flex cracking and crack growth/times		1.4 × 10⁵	5.0 × 10⁵

Note(s): ^aCR, chloroprene rubber; NR, natural rubber

Source(s): Authors’ own work