No wrinkle,spot,blister,crack,off,Glued tyres
,the colour of fill appearance should be closed to standard
There's no abnormal phenomena 24 hours after being
Soaked in the Saturated calcium chloride solution
Keep 4h in ten degrees below zero
,then keep 4h in indoor temperature.
After repeating three times, there’s no crack
Keep 4h in between 200℃ to 220℃ when stiring
,there's no obvious phenomenon of yellowing,coking,caking etc.