What causes supply bottlenecks for photoinitiators? The main reasons are the tightened environmental regulations in China, the main supplier of photo initiators and their raw materials. From a sustainability point of view, these initiatives by the authorities are to be welcomed. However, they have led to suppliers temporarily stopping production. Other developments were a plant fire, low inventory levels and further production stoppages. Because photo initiators are generally small volume raw materials, the deadline for registering such substances under REACH has had a negative impact. The ink industry has been informed by suppliers that widely used photo initiators must now ...