Storage Methods： Storage to avoid direct sunlight, moisture in and keep packing condition; Storage Period： Room temperature in ambient humidity,（23±10℃，55±15%RH）12 Months.1.Why choose XinDongke Solar? We established the business department and a warehouse which covers 6660 square meters in Fuyang, Zhejiang. Advanced technology, professional manufacture, and excellent quality. 100% A grade cells with ±3% power tolerance range. High module conversion efficiency, low module price Anti-reflective and high viscous EVA High light transmission Anti-reflective glass 10-12 years product warranty, 25 years limited power warranty. Strong productive ability and quick delivery. 2.What are your products lead time ? 10-15days fast delivery. 3.Do you have some cerfiticates ? Yes, we have ISO 9001, TUV nord for our Solar Glass, EVA film, Silicone sealant etc. 4.How can I get a sample for quality testing? We can provide some free small size samples for customers to make a testing. Sample shipping fees should be paid by customers. kindly notes. 5.What kind of solar glass can we choose? 1) Thickness available: 2.0/2.5/2.8/3.2/4.0/5.0mm solar glass for solar panels. 2) The glass used for BIPV / Greenhouse / Mirror etc. can be custom according to your request.Ultra clear  solar glass is specilally designed for solar panel modules,  it has many features such as super strong, super clear,  super solar transmittance, Thickness: 3.2/4/5mm Size: According to customer needs transmittance91~93%