Paraformaldehyde

  • Polyoxymethylene
  • Paraform
  • Formagen
Formula
(CH2O)x
Structure
Description
A white solid with a light pungent odor. A linear polymer of formaldehyde of formula HO(CH2 O)xH where x averages about 30.
Uses
Microbiocide, Fungicide, Insecticide

Registry Numbers and Inventories.
CAS
30525-89-4
EC (EINECS/ELINCS)
200-001-8
EC Class
harmful, irritant, carcinogenic, sensitizing
R 20/22 34 40 43
S 22 26 36/37/39 45
RTECS
RV0540000
RTECS class
Agricultural Chemical and Pesticide; Mutagen; Primary Irritant
UN (DOT)
2213
Merck
12,7158
Beilstein/Gmelin
102769
EPA OPP
600026
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
(CH2O)n
Formula mass
30.01
Melting point, °C
123
Boiling point, °C
135 - 136 (13 torr)
Vapor pressure, mmHg
11
Density
1.46 g/cm3 (20 C)
Solubility in water
Decomposes
Heat of combustion
-589 kJ/mol

Hazards and Protection.
Storage
Keep away from heat and flame. Keep from contact with oxidizing materials. Store in a cool, dry, well-ventilated area away from incompatible substances. Keep containers tightly closed. Keep away from strong bases.
Handling
Wash thoroughly after handling. Wash hands before eating. Remove contaminated clothing and wash before reuse. Use only in a well ventilated area. Minimize dust generation and accumulation. Do not get on skin or in eyes. Do not ingest or inhale.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
A respiratory protection program that meets OSHA's 29 CFR 1910.134 and ANSI Z88.2 requirements or European Standard EN 149 must be followed whenever workplace conditions warrant a respirator's use.
Small spills/leaks
Vacuum or sweep up material and place into a suitable disposal container. Avoid generating dusty conditions. Remove all sources of ignition. Provide ventilation. A vapor suppressing foam may be used to reduce vapors.
Stability
Stable, however, can decompose above 260 C.
Incompatibilities
Strong oxidizing agents, strong bases, isocyanates, anhydrides, bronze, brass, copper, copper alloys, steel, strong reducing agents, acids.
Decomposition
Carbon monoxide, irritating and toxic fumes and gases, carbon dioxide, formaldehyde.

Fire.
Autoignition, °C
300
Upper exp. limit, %
73
Lower exp. limit, %
7
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Dusts at sufficient concentrations can form explosive mixtures with air. Combustion generates toxic fumes. Flammable solid. May re-ignite after fire is extinguished. May burn rapidly with flare-burning effect. Extinguishing media: For large fires, use water spray, fog or regular foam. For small fires, use dry chemical, carbon dioxide, sand, earth, water spray or regular foam. Cool containers with flooding quantities of water until well after fire is out.
Fire potential
Moderately flammable. Requires moderate heating.
Hazards
Changes to formaldehyde gas, which is highly flammable.
Combustion products
When heated, it emits formaldehyde gas and carbon monoxide..
Health
3
 
Flammability
2
 
 
Reactivity
1
 

Health.
Exposure limit(s)
C 0.3 ppm TLV {C 0.37 mg/m3}
Carcinogin
O, G-A2, I-2A, N-2
Poison_Class
4 (Substances and products that must be considered harmful)
Exposure effects
Prolonged or repeated eye contact may cause conjunctivitis. Repeated inhalation may cause chronic bronchitis. Repeated exposure may cause sensitization dermatitis.
   Ingestion
Symptoms may include: headache, excitement, fatigue, nausea, vomiting, stupor, and coma. May cause systemic toxicity with acidosis. May cause severe digestive tract irritation with abdominal pain, nausea, vomiting and diarrhea. May be harmful if swallowed.
   Inhalation
May cause severe irritation of the upper respiratory tract with pain, burns, and inflammation. May cause anosmia (loss of smell). Inhalation of high concentrations may cause pulmonary edema. Harmful if inhaled.
   Skin
May cause skin sensitization, an allergic reaction, which becomes evident upon re-exposure to this material. May cause hives. Causes severe skin irritation and possible burns. Contact with dust causes drying, cracking, and scaling of the skin.
   Eyes
May result in corneal injury. Causes severe eye irritation and burns.

First aid
 
   Ingestion
Do NOT induce vomiting. If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.
   Inhalation
Get medical aid immediately. Remove from exposure to fresh air immediately. If breathing is difficult, give oxygen. DO NOT use mouth-to-mouth respiration.
   Skin
Get medical aid immediately. Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Remove contaminated clothing and shoes.
   Eyes
Get medical aid immediately. Do NOT allow victim to rub or keep eyes closed. Extensive irrigation is required (at least 30 minutes).

Transport.
UN number
2213
Response guide
Hazard class
4.1
Packing Group
III
 
USCG CHRIS Code
PFA
 
HS Code
3808 40 90
 
Std. Transport #
4917404