This invention discloses a high-density,
char-forming,
halogen-free
flame-retardant PP sheet and
flame-retardant file boxes, folders, and other office plastic products, belonging to the field of
polymer flame-retardant materials technology. This invention employs a unique high-density phase
halogen-free composite flame-retardant
system, interface anchoring compatibility technology, and self-lubricating cross-linking
toughening technology, achieving UL94 V-0 high-efficiency flame retardancy with low additive dosage. It is
halogen-free, low-
smoke,
environmentally friendly, and safe, while also possessing advantages such as high
flexural strength,
high stiffness, non-deformation, and no powdering. It completely solves the drawbacks of traditional flame-retardant PP materials, such as easy
cracking, melting and dripping, poor processability, and ease of
imitation. The technical approach of this invention is completely different from existing patents, exhibiting outstanding inventiveness, high difficulty in
imitation, and strong patent
authorization stability. It is suitable for office stationery products such as file boxes, folders, and document books, and can be widely used in archives, libraries, government agencies, and other places, possessing extremely high industrial production value and core patent protection value.