| 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
|
