Modified mould pressing rubber

1. 
   

   	JF-4540	JF-4545	JF-4550	JF-4560	JF-4570
   Appearance	translucent, without obvious mechanical impurities
   Density          g/cm3	1.12±0.05	1.14±0.05	1.16±0.05	1.20±0.05	1.22±0.05
   Hardness          Shore A	40±2	45±2	50±2	60±2	70±2
   Tensile strength      MPa≥	7.5	8.0	8.0	8.0	7.5
   Elongation at failure     % ≥	800	750	650	500	360
   Permanent set at break    %≤	8	8	8	6	6
   Tear strength     kN/m≥	28	30	35	35	35
   Volume resistivity   Ω·cm≥	1.0×1015
   Dielectric strength     kV/mm≥	20

   Physical and mechanical performance indexes are Once vulcanization data, electrical property indexes are Secondary vulcanization data
   Once vulcanization condition for experimental sheet: 175℃×5min Secondary vulcanization condition: 200℃×3hr
   Vulcanizing agent: DHBP (active matter is 80%), dosage 0.7%