Ammonium Pentaborate

Catalog	ACM12046047-1
CAS	12046-04-7
Structure
Description	Borates change the oxidation reactions in the combustion of cellulosic materials to cause the formation of carbon residue. This charring action forms a barrier to combustion, and diverts the decomposition products that would alternatively smolder. Ammonium pentaborate solutions can be sprayed on paper or the paper can be dipped into the solutions to yield a fire-retarded product. It can also be used as an ingredient in other flame proofing formulations for cellulosic materials. In polymer applications, Ammonium pentaborate can be used as an effective flame retardant, spumific agent, and char promoter in epoxy, TPU, and urethane foam amongst others.
Molecular Weight	272.15
Molecular Formula	(NH4)B5O8 · 4H2O
Melting Point	Ammonium pentaborate is stable to about 110°C at which point it loses all but two moles of water. If heated sufficiently, ammonium pentaborate will release the balance of its hydration water and decompose to boric oxide and ammonia.
Content	Boric oxide, B2O3: 63.95% Ammonium oxide, (NH4)2O: 9.57% Water of crystallization, H2O: 26.48%
Notes	Readily reacts with CO2 in air.
Packaging	500 g in poly bottle 1 kg in poly bottle
pH	7.32 @ 25°C(10.0% solution)
Specific Gravity	1.58
Stability	Ammonium pentaborate shows little tendency to cake except after prolonged storage or if it becomes severely wetted by rain or substantial water penetration. It is also capable of absorbing moisture if exposed to a humid environment.

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