I faced the brittle problem with my currently hot melt product. I own one book binding factory, can somebody tell me if it is the normal situation or I chose the wrong hot melt items ?

According to Nanpao selling experience, Brittle issue often happens in the winter season. Hot melt suppliers usually put the filler into book binding HMA to achieve the cost down, I suggest you to contact with NANPAO sales to give you the best products 

Generally, we will suggest to use 2 product for the whole book construction:

• Spine：Nanpao HM-718
• Side：Nanpao HM-618