PARAFORMALDEHYDE

PRODUCT IDENTIFICATION

CAS NO. 30525-89-4; 53026-80-5

 

EINECS NO. unlisted
FORMULA HO(CH2O)nH (n = 6 - 100 )
MOL WT. (30.03)n
H.S. CODE 2912.60

TOXICITY

Oral rat LD50: 800 mg/kg
SYNONYMS Paraform, Polyoxymethane, Formagene;
Polyformaldehyde; Polyoxymethylene; Formaldehyde Polymer; Polyoxymethylene Glycol; Trioxymethylene; Paraformaldehydum; Paraformic aldehyde; Metaformaldehyde;

SMILES

 

CLASSIFICATION

DISINFECTANTS /

PHYSICAL AND CHEMICAL PROPERTIES

PHYSICAL STATE White solid, formaldehyde-like odor
MELTING POINT 80 - 155 C (85%), 120 - 175 C (91%), 175 C (95%)
BOILING POINT Slowly sublimes
SPECIFIC GRAVITY 1.25 - 1.35 (86%), 1.30 - 1.4- (91%), 1.35 - 1.45 (95%)
SOLUBILITY IN WATER soluble in hot water (insoluble in alcohol, ether)
pH neutral to litmus
VAPOR DENSITY  

AUTOIGNITION

300 C

REFRACTIVE INDEX

 

NFPA RATINGS

Health: 3 Flammability: 1 Reactivity: 0
FLASH POINT

63 ( 86%) - 93 C (95%)

STABILITY Stable under ordinary conditions (Slowly sublimes to formaldehyde)

GENERAL DESCRIPTION & APPLICATION

Formaldehyde is the simplest aldehyde with the formula HCH=O. It is a gas at room temperature with a pungent smell. It cannot be readily isolated or handled in the pure state because it is extremely reactive. Formaldehyde reversibly polymerizes to its cyclic trimer 1,3,5-trioxane or the linear polymer polyoxymethylene. It is readily oxidized to form formic acid in the air. It is commercially available as an aqueous solution usually 37-50% w/w. Formalin is the solution of formaldehyde in water. Paraformaldehyde is a white crystalline solid formed by polymerization of formaldehyde. Formaldehyde kills most bacteria, and used as a disinfectant and as a preservative and fixative for pathologic specimens. Formaldehyde cross links amino groups. In industry formaldehyde is used in the production of thermoset resins, functional polyols, explosive, hexamine and other chemicals.

Paraformaldehyde is a white crystalline solid formed by polymerization of methanal gas (formaldehyde, HCHO) by heating. Lower molecule paraformaldehyde is soluble alkali but insoluble in alcohol, ether, and water. It is used as fumigant, disinfectant, and fungicide. Higher molecule homopolymer is a hard engineering plastic which is strong, rigid, and have good moisture, heat, and solvent resistance. Commercially acetal copolymers are also widely used for industrial and automotive applications with excellent balance of properties and processing characteristics. Paraformaldehyde is used to make various resins with mainly phenol (melamine resin; phenol resin; vinylon; polyacetal resin; terephthalic acid; diphenyl methane diisocyanate, acrylic acid esters)

SALES SPECIFICATION

APPEARANCE

white solid
CONTENT

85.0% min or 91.0% min or 95.0% min

FREE ACID

0.02% max (as Formic Acid)

RESIDUE ON IGNITION

0.01% max

Cl

0.002% max

Fe

0.001% max

HEAVY METALS (Pb)

0.002% max

TRANSPORTATION
PACKING 25kgs in a bag or 300 - 1,000kgs in super bag
HAZARD CLASS 4.1 (Packing Group: III)
UN NO. 2213
REMARKS
Hazard Symbols: XN, Risk Phrases: 22/36/37/38/40, Safety Phrases: 26/28

 

Click to See Supplier Banner

Click to Close Banner