UL certificate is a passport for a product to enter international market. UL is the trade mark of US underwriter laboratories Inc. UL is an authoritative ISO 9000 organization in USA, and is the safety test center in the world. UL is also an independent, nonprofit and authoritative test organization and service company for public safety.

TONSAN 1527 silicone flange sealant has been widely used in the sealing of solar energy panels, and are being recognized and used by large electronic market. Customers from Shanghai, Wuxi, Changzhou, Hebei, Shangdong must bear a UL label on their products before they can sell their products to USA to guarantee that the products are safe and reliable, otherwise US customs can refuse their entrance. To meet domestic and international needs, our TONSAN 1527 silicone sealant passed UL test and was publicized in world wide web, the document number is: E253998, project number: 04CA54527. UL made a first factory test in May. Our TONSAN 1527 packages have now UL labels.

With UL certificate, we can say we have a green card for the product to enter international market. Hence we have stronger market competitiveness, laying a stable foundation for our other products to enter world market.