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Organic Borates / ZINC BORATE

Characteristics

Zinc Borate is an environmentally friendly halogen-free flame retardant.  There are some formulations of XZnO. YB2O3. ZH2O, in which Zinc Borate with 3.5 hydrate is called ZB-2335 (2ZnO. 3B2O33. 5H2O) is the most common used grade.  It is practically non-toxic, has slight solubility in water, good thermal stability, fine particle size, low specific gravity and good free-flowing properties.  It is a highly efficient flame retardant and is widely used in plastic, rubber, coatings etc.

 

Properties: Limits:
Appearance: White powder
Surface water, % max: 0.50
Particle size, μm: 3~5
ZnO, %: 37-40
B2O3, %: 45-48
H2O (hydrate), %: 13.5-15.5
Residue on sieve (45 μm), % max: 0.10
Specific Gravity, g/cm3: 2.67
Melting Point, °C: 980
Temp. of dehydration, °C min: 320
Refractive Index: 1.58