Solar Module: 1,TUV ,CE, RoHS ,ISO900. 2,10 years quality warranty. 3,High transmissivity low iron toughened glass. TEST CONDITION TEST CONDITIONS :1000w,AM1 ... test227g steel ball fall down from 1m heightEncapsulated with toughened glass Low iron tempered glass with thickness of 3.2mm,light transmittance above91%Backside foil ... product warranty,10years 90% and 20yesr 85% of the power Solar Module