1.Surface without burr, lack of glue, stoma defects. 2. Ozone concentration ozone-resisting 50PPhm 20% of elongation; Load, temperature 70 ℃ within 72 hours after, no crack. 3. weatherability :-30Φc-110ΦC. 4. Fatigue properties: under normal usage, 200,000 times without cracking. 5. weatherability :-30Φc-110ΦC. 6. Fatigue properties: under normal usage, 200,000 times without cracking .