ALUMINIUM HYDROXIDE

PRODUCT IDENTIFICATION

CAS NO.

21645-51-2

ALUMINIUM HYDROXIDE

EINECS NO. 244-492-7
FORMULA

Al(OH)3

MOL WT. 78

H.S. CODE

2818.30
TOXICITY  
SYNONYMS Hydrated alumina; Alumina hydrate; Alumina trihydrate;
ATH; Aluminum hydrate; Aluminum trihydrate; Alhydrogel; Superfos; Amphogel; Aluminum (III) hydroxide; Amorphous alumina; Trihydrated Alumina; Trihydroxyaluminum;
RAW MATERIALS  

CLASSIFICATION

 

GENERAL DESCRIPTION

Hydrated alumina, also known as alumina trihydrate (ATH), or simply hydrate, is more accurately chemically designated as aluminum trihydroxide, Al(OH)3. It is a non-abrasive powder with a Mohs' hardness index of 2.5 - 3.5 and a specific gravity of 2.42. Alumina trihydrate is the largest volume flame retardant used in the world. On heating to 200°C, hydrated alumina decomposes into 66% alumina and 34% water. This irreversible process is, in part, what makes ATH an effective flame retardant.  Aluminium hydroxide is also used as an adsorbent, emulsifier, ion exchanger, mordant, antacid, and filtering medium. It is also used in the manufacture of paper, ceramics, printing inks, detergents, for waterproofing fabrics and in dentrifrices and antiperspirants  

PHYSICAL AND CHEMICAL PROPERTIES

PHYSICAL STATE odorless white powder
MELTING POINT

300 C

BOILING POINT  
SPECIFIC GRAVITY 2.42
SOLUBILITY IN WATER insoluble
pH weak basic
VAPOR DENSITY  

AUTOIGNITION

 

NFPA RATINGS

Health: 1; Flammability: 0; Reactivity: 0

REFRACTIVE INDEX

 

FLASH POINT Not considered to be a fire hazard
STABILITY Stable under ordinary conditions

APPLICATIONS

Production of aluminum chemicals. Major products include alum (aluminum sulfate), poly aluminum chloride (PAC), sodium aluminate, zeolites, aluminum fluoride. A raw material in the manufacture of glass, glazes and frits . A raw material in catalyst production . A flame retardant and smoke suppressant filler in plastics like: cables, rubber products and carpet backing. A raw material for fertilizers, and fibre cement board products. An extender and bodying agent in paper, solvent- and water-borne paints, UV curable coatings, inks, and adhesives. A polishing and cleansing agent, mould wash and separating agent A filler of cast polymer products such as onyx and solid surfaces.

SALES SPECIFICATION

APPEARANCE

white powder

Al(OH)3

99.5% min

Al2O3

64.0% min

SiO2 

0.015% max

Fe2O3

0.02% max

MOISTURE

8.0% - 10.0%

LOSS ON IGNITION

34.0 - 35.0%

WHITENESS

85% min

PARTICLE SIZE

+150um (3.0% max)
+75um (45.0% max)
+45um (40.0%max)
-26um (8.0% max)

TRANSPORTATION

PACKING 25kgs, 50kgs, 1mt in Bag
HAZARD CLASS  
UN NO.  
GENERAL DESCRIPTION OF FLAME RETARDANT AGENT
Flame Retardant are substances that can be chemically inserted into the polymer molecule or be physically blended in polymers after polymerization to suppress, reduce, delay or modify the propagation of a flame through a plastic materials. There are several classes of flame retardants; Halogenated Hydrocarbons (Chlorine and Bromine containing compounds and reactive flame retardants), Inorganic flame retardants ( Boron compounds, Antimony oxides, Aluminium Hydroxide, molybdenum compounds, zinc and magnesium oxides ), Phosphorous containing compounds (Organic phosphate esters, phosphates, halogenated phosphorus compounds and inorganic phosphorus containing salts).

Class of Flame Retardants

  • Inorganic
    • Metal hydroxides
      • Aluminium hydroxide
      • Magnesium hydroxide
      • Orthers
    • Antimony compounds
      • Antimony trioxide
      • antimony pentoxide
      • Sodium antimonate
      • Others
    • Boron compounds
      • Boric acid
      • Borax
      • Zinc borate
      • Others
    • Other metal compounds
      • Molybdenum compounds
      • Titanium compounds
      • Zirconium compounds
      • Zinc compounds
        • Zinc stannate
        • Zinc hydroxy-stannate
        • Others
      • Others
    • Phosphorus compounds
      • Red phosphorus
      • Ammonium polyphosphate
      • Others
    • Other inorganic flame retardants
      • ammonium sulfamate
      • ammonium bromide
      • Others
  • Halogenated organic
    • Brominated
      • Tetrabromobisphenol A
      • Decabromodiphenyl ether
      • Octabromobiphenyl ether
      • Tetrabromobiphenyl ether
      • Hexabromocyclododecane
      • Tribromophenol
      • Bis(tribromophenoxy) ethane
      • Tetrabromobisphenol A polycarbonate oligomers
      • Tetrabromobisphenol A epoxy oligomers
      • Others
    • Chlorinated
      • Chlorinated paraffins
      • Bis(hexachlorocyclopentadieno)cyclo-octane
      • Others
  • Organophosphoros
    • Non-halogenated compounds
      • phosphate esters
        • Ttrialkyl phosphates
        • Triaryl phosphates
        • Aryl-alkyl phosphates
        • Others
      • polyols
      • phosphonium derivatives
      • phosphonates
      • Others
    • Halogenated phosphates
      • Tris(1-chloro- 2-propyl) phosphate
      • Tris(2-chloroethyl) phosphate
      • Tris(2,3-dibromopropyl)phosphate
      • Others
  • Nitrogen-based
    • Polyurethanes
    • Polyamides
    • Melamine and its salts
    • Guanidine compounds
    • Others 
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