Reason lead to the cracking issue
Bonding glue
jointed quality
Humidity
Product finish
Glue's quality
When use common glue to bond bamboo or wood raw material into board, it will be fine to sold to the Country with warm weather, but it is not safe to sell the product to cold countries . The bonding strength is not strong to stand Expansion and Contraction, and then cracking.
Humidity
Normally speaking, the qualified bamboo product’s humidity is with 9-14. But North European’s weather is cold and very dry, and if the product’s is a bit high humidity like 13 or 14, when we bring the product on the market shelf from master carton, the product become dry suddenly, then cracking.