Zinc Borate

Specification of Zinc Borate
Chemical formula 2 Zno.3 B2O3.3.5H2O Appearance White amorphous powder Bulk density(g/cm3) 0.3-0.5 gm / cc pH of filtrate of 20% aqueous 7.0 -8.0 Sieve residue (200 mesh 75 micron) 0.2% max Ignition loss (950°C) 15.5% max Zno Content 37.0% min B2O3 Content 47.0% min
Zinc Borate (ZB) Addition Level
Applications	Addition Rate	Comments
1 PVC		Benefits: Smoke suppression, Synergy, Char Formation.
a) PVC Wiring Compound	2 phr.	Product UL 94, V- 0 rating, L.O.I 31.5% 65% Smoke reduction (Flaming) compared with 3 phr Antimony Trioxide. 37% Smoke reduction (Somouldering) compared with 3 phr Antimony Trioxide (NBS Smoke Chamber Test). Heat Stability> 150 min at 185OC. After flame time -13 seconds (10 ignitions.)
	2 phr	Plus 1.0 phr Antimony Trioxide addition addition. UL 94, v-0 rating, L.O.I. 34.5% 53% Smoke reduction (Flaming) c.f.3 phr Antimony Trioxide. 34% Smoke reduction (Smouldering) Char Formation 26% (plus 0.5 phr Antimony Trioxide)
b) PVC Cable Compound	1.5 phr	Pus addition of 15 phr Alumina Trihydrate and 1.5 phr Antimony Trioxide. UL 94 V-01 rating L.O.I 31% 48% Smoke reduction (Flaming) c.f 3 phr Antimony Trioxide 21% Smoke reduction (Smouldering). Heat Stability 75 min at 185°C
c) PVC Plastisol 50 phr DOP	5 phr	Plus addition of 5 phr Antimony Trioxide. UL 94, V-0 rating L.O.I 31.5% 24% Smoke reduction (Flaming) c.f. 10 phr Antimony Trioxide. 55% Smoke reduction (Smouldering After flame time- 0 seconds)
2 Halogen – Free Cable Compounds		Benefits: Smoke suppression, Synergy, After flame Reduction, Char Formation
A) Ethylene Finyl Acetate	10 phr	Plus addition of 170 phr Alumina Trihydrate, 20 phr magnesium Carbonate UL 94, V-0 rating, L.O.I 39.0% Smoke Density Dmax> 250.
	5 phr	Plus addition of 195 phr Alumina Trihydrate, 10% smoke reduction
	10 phr	Plus addition of 190 phr Alumina Trihydrate, 35% smoke reduction
	100 phr	Plus addition of 100% phr Alumina Trihydrate, 35% smoke reduction
b) EPDMUHF Cured	10 phr	Plus addition of 150 phr magnesium Hydroxide, UL 94, V-0 rating. After flame duration 3 seconds. Glow duration 3 seconds.
3 Conveyor Belting		Benefits: Synergy, Afterglow suppression
a) Neoprene / SBR Blend	15 phr	Plus addition of 14 phr Alumina Trihydrate + 5 phr Antimony Trioxide. UL 94, V-0 rating, L.O.I 45% Also meets German DIN STD 22118
b) Neoprene	10 phr	Plus addition of 25 phr Antimony Trioxide. UL 94, V-0 rating no Afterburn or Afterglow
4) Nylon 6.6		Benefits: Synergy, Anti- Drip, Electrical Track Property Improvement
a) Nylon 6 Copolymer (Glass Reinforced )	3 phr	Plus addition of 20 phr Melamine, 3 Phr Dechlorance plus UL 94, V-0 rating – speciment thickness 1.66 mm. Comparative Tracking 0.4. (CTI)-451 volts.
b) Nylon 6.6	10 phr	Plus addition of 20 phr Dechlorance, plus UL 94, V-0 rating – specimen thickness 0.4. CTI-300 volts.
c) Nylon 6	2.5	Plus addition of 20 phr Dechloration plus. 2.5 phr Antimony Trioxide UL 94, V-0 rating – specimen thickness 1.66 mm CTI-425 volts.
5 Glass Reinforced Polyester		Benefits: Synergy Smoke levels contained
a) Brominated Polyester	2.90%	Used alone, UL 94, L.O.I., 35.5% Smoke levels limited to inherent resin levels, ie approx. 12% (Arapahoe method).
b) Chlorinated Polyester	1.2%	Plus addition of 1.2% Antimony Trihydrate UL 94, V-0 L.O.I 43% Smoke limited to resin level, ie approx. 13%
c) Halogen Free	10%	Plus addition of 30% Alumina Trihydrate + 105 Phos-check P 30 U194, V -0 L.O.I. 31.0% Addition of Zinc Borate in this (Arapahoes test) form 6.5% to 4.7%
6 Epoxy		Benefit : Synergism, L.O.I Improvement
	2.5 phr	Plus addition of 25.5 phr Dechlorane Plus +2 .5 phr Antimony Trioxide. UL 94, V-0, L.O.I 28.0%
7 Carper Backing		Benefits: Bond strength improvement c.f Antimony Trioxide or Alumina Trihydrate.
a) PVC Latex	10 phr	Adhesive backing layer for Nylon 6.6 carpet Low smoke carpets eg Aircraft
8 General Rubber	5 phr	Benefits: Afterglow suppression can be used in conjunction with Chlorinated Paraffin to improve Flame Reardancy
9 Cotton Fabric	15% on weight of other flame Retardants present	Benefits: Afterlow suppression. Cotton/polycotton latex.
Treatment		Coating typically containing Decabromo / Antimony Trioxide BS 528 afterglow requirement possible