New aluminum substrate solves COB "sulfiding"…

[China Aluminum] The aluminum substrate has only been applied in some special fields earlier. In recent years, with the rapid development of LED lighting, it has emerged from the big PCB family. LED lighting products are mainly composed of three major structures: light sources, power supplies, and-----

Safety helmet regulations

1. It is forbidden to change any structure of the helmet arbitrarily. 2. Never use a safety helmet as a utensil. 3. Never use a safety helmet as a seat cushion. 4. Do not scribble or post graphics on helmets. 5. The supply and marketing company shall store all qualified helmets that are qualifi-----