... condition of ultra-violet radiation, humidity, heat, chillness and impact.Our resin roof tile has passed 12,000 hours accelerated ... the connection is tight, thus it is good in watertightness.Impact Resistance and Low Temperature ResistanceAccording to the physical experiment, Jieli ... 2m height nor breaks after 10 times of falling ball impact at a low temperature. Through 30 freeze thawing recycle ...