Characteristical：
It appears as white crystalline powder, insoluble in water but slightly soluble in alcohol.
Application：
・Polybenzimidazole (PBI)
・Polyester
・Unsaturated polyester resin (UPR)
・Polyethylene terephthalate (PET) resin
・Raw materials for Polyurethane adhesive .
・Raw materials for polyester coating resin products.
・Refractory material (refractory and heat-resistant fiber) Nomex.
・Raw materials for copolyester products (PET bottles, low melting point cotton, etc.).
・Raw material for polyester fiber dyeing modifier. (Makes the dyed fabrics more colorful and reduces the dyeing and finishing temperature.)
・Raw material for unsaturated polyester resin products. (Such as ships, auto parts, artificial marble building materials, paints, buttons, polystyrene boards, etc.)
Specification
| Item | Specification | Product (Typical) |
| Purity(wt%) | Min 99.8% | Min 99.9% |
| Acid nmber(mg KOH/gm) | 675±2 | 675±2 |
| 3-CBA(ppm w/w) | Max 25 | Max 25 |
| m-Toluic acid(ppm w/w) | Max 150 | Max 150 |
| Moistur(wt%) | Max 0.15 | Max 0.10 |
| b*(colour) | Max 1.0 | Max 1.0 |
| APHA colour(2N KOH) | Max 15 | Max 10 |
| Aah(ppm w/w) | Max 15 | Max 9 |
| Metals(ppm w/w) | None greater than 2 and in total max 10 | None greater than 1.0 and in total max 6 |
| Median particle size(um) | - | 120±30 |