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Paraformaldehyde

CAS No.
30525-89-4
Chemical Name:
Paraformaldehyde
Synonyms
POLYFORMALDEHYDE;POLYACETAL;P-FORMALDEHYDE;PARAFORM;FORMALDEHYDE RESIN;ACETAL RESIN;aldacide;Granuform;Paraformalclehyde;formaldehydepolymer
CBNumber:
CB5233205
Molecular Formula:
(CH2O)x
Molecular Weight:
30.03
MDL Number:
MFCD00133991
MOL File:
30525-89-4.mol
Last updated:2023-11-28 16:31:43

Paraformaldehyde Properties

Melting point 120-170 °C (lit.)
Boiling point 107.25°C (rough estimate)
Density 0.88 g/mL at 25 °C (lit.)
vapor density 1.03 (vs air)
vapor pressure <1.45 mm Hg ( 25 °C)
refractive index 1.4540 (estimate)
Flash point 158 °F
storage temp. 2-8°C
solubility chlorophenol above 70°C: soluble
form prilled
color White to off-white
PH 5.5 (H2O, 20℃)(saturated solution)
Odor odor of formaldehyde
PH Range 4 - 5.5
explosive limit 7-73%(V)
Water Solubility sparingly soluble
Merck 14,7025
BRN 102769
Dielectric constant 4.0(Ambient)
Stability Stable. Incompatible with strong acids, organic acids, strong oxidizing agents, oxides, alkalies, strong bases, amines. Combustible. Dust may form an explosive mixture with air. Liberates poisonous gases on combustion.
InChIKey VHWYCFISAQVCCP-UHFFFAOYSA-N
Indirect Additives used in Food Contact Substances PARAFORMALDEHYDE
FDA 21 CFR 175.105; 176.170; 177.1210
EWG's Food Scores 4
FDA UNII Y19UC83H8E
EPA Substance Registry System Paraformaldehyde (30525-89-4)

SAFETY

Risk and Safety Statements

Symbol(GHS)  GHS hazard pictogramsGHS hazard pictogramsGHS hazard pictogramsGHS hazard pictograms
GHS02,GHS05,GHS07,GHS08
Signal word  Danger
Hazard statements  H228-H302+H332-H315-H317-H318-H335-H341-H350
Precautionary statements  P210-P280-P301+P312-P304+P340+P312-P305+P351+P338-P308+P313
Hazard Codes  Xn,F
Risk Statements  31-43-40-36/37/38-20/22-41-37/38-42/43-20/21/22-11
Safety Statements  36-45-36/37/39-26-24-22
RIDADR  UN 2213 4.1/PG 3
WGK Germany  3
RTECS  RV0540000
Autoignition Temperature 572 °F
TSCA  Yes
HazardClass  4.1
PackingGroup  III
HS Code  38084090
Toxicity LD50 orally in Rabbit: 592 mg/kg
NFPA 704
1
3 0

Paraformaldehyde price More Price(36)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 8.18715 Paraformaldehyde for synthesis 30525-89-4 100g $40.1 2024-03-01 Buy
Sigma-Aldrich 8.18715 Paraformaldehyde for synthesis 30525-89-4 1kg $131 2024-03-01 Buy
Sigma-Aldrich 158127 Paraformaldehyde powder, 95% 30525-89-4 5g $34.2 2024-03-01 Buy
Sigma-Aldrich 158127 Paraformaldehyde powder, 95% 30525-89-4 3kg $210 2024-03-01 Buy
Sigma-Aldrich 1.04005 Paraformaldehyde EMPROVE? ESSENTIAL, DAC 30525-89-4 1KG $53 2022-05-15 Buy
Product number Packaging Price Buy
8.18715 100g $40.1 Buy
8.18715 1kg $131 Buy
158127 5g $34.2 Buy
158127 3kg $210 Buy
1.04005 1KG $53 Buy

Paraformaldehyde Chemical Properties,Uses,Production

Chemical Properties

Paraformaldehyde is a polymerized form of formaldehyde (CHO) and is a stable white crystalline powder with the odor of monomeric formaldehyde. Because pure formaldehyde is unstable at ambient conditions, paraformaldehyde is used as a readily-usable form of formaldehyde at use sites. Then,formaldehyde gas is generated during heating. Paraformaldehyde is used for different applications as a source of either gaseousformaldehyde or solution formaldehyde.

Characteristics

Paraformaldehyde is the smallest solid form of liquid formaldehyde, formed by the polymerization of formaldehyde with a typical degree of polymerization of 8-100 units. As paraformaldehyde is basically a condensed form of formaldehyde, it possesses the common characteristics with a wide range of applications. It does not need to be dissolved in water in order to take part in a chemical reaction. Use of paraformaldehyde is convenient and safe. It avoids pollution arising from the disposal of the distillate obtained in the thermosetting resin production which is contaminated with organic matter. Paraformaldehyde made with very low acid content in a chemical resistant environment can prevent the formation of acidic by-products.

Uses

Paraformaldehyde is used as a fumigant, a disinfectant and in the manufacture of synthetic resins like melamine resin, phenol resin and polyacetal resin. It is also used in cell culture. It also serves as a fixative in electron microscopy. It is also used in the preparation of formalin fixatives for tissues or cells. To use the chemical as a fixative, it must be converted to the monomer formaldehyde by heating as formaldehyde is the active chemical in fixation.

Definition

ChEBI: Paraformaldehyde is a macromolecule composed of repeating methyleneoxy units arising from polymerisation of formaldehyde.

Preparation

Paraformaldehyde [30525-89-4] was first produced in 1859. This polymer, at first mistakenly called dioxymethylene and trioxymethylene, consists of a mixture of poly(oxymethylene) glycols HO-(CH2O)n-H with n=8-100. The formaldehyde content varies between 90 and 99 % depending on the degree of polymerization n (the remainder is bound or free water). It is an industrially important linear polyoxymethylene.
Paraformaldehyde is prepared industrially in continuously operated plants by concentrating aqueous formaldehyde solutions under vacuum conditions. At first, colloidal, waxy gels are obtained, which later become brittle. The use of a fractionating column through which gases were passed dates from about 1925.
Paraformaldehyde is currently produced in several steps which are carried out at low pressure and various temperatures. Highly reactive formaldehyde is produced under vacuum conditions starting with solutions that contain 50-100 ppm of formic acid and also 1-15 ppm of metal formates where the metals have an atomic number of 23-30 (e.g., Mn, Co, and Cu). The solutions are processed in thin-layer evaporators and spray dryers.

General Description

Paraformaldehyde appears as a white solid with a light pungent odor. A linear polymer of formaldehyde of formula HO(CH2-O)xH where x averages about 30. Soluble in water when x is less than 12; higher polymers are not immediately soluble. Slow dissolution in water proceeds by means of hydrolysis to give fragments of lower x. Flammable, although may take some effort to ignite. Flash point 158 °F. Used in fungicides, bactericides, and in the manufacture of adhesives. A hazard to the environment. Immediate steps should be taken to limit spread to the environment.

Air & Water Reactions

Flammable. Forms aqueous solution of formaldehyde, often quite slowly.

Reactivity Profile

Paraformaldehyde may react violently with strong oxidizing agents (hydrogen peroxide, performic acid, perchloric acid in the presence of aniline, potassium permanganate, nitromethane). May react with bases (sodium hydroxide, potassium hydroxide, ammonia), and with nitrogen dioxide (explosive reaction around 180°C). Reacts with hydrochloric acid to form highly toxic bis(chloromethyl) ether. Polymerization reaction with phenol may develop sudden destructive pressure [Bretherick, 5th ed., 1995, p.168]. May generate flammable and/or toxic gases in combination with azo, diazo compounds, dithiocarbamates, nitrides, and strong reducing agents. Generates toxic formaldehyde gas when heated. Can react with air to give first peroxo acids, and ultimately formic acid. These reactions are activated by light, catalyzed by salts of transition metals, and are autocatalytic (catalyzed by the products of the reaction). Incompatible with liquid oxygen.

Health Hazard

Vapor or dust irritates eyes, mucous membranes, and skin; may cause dermatitis. Ingestion of solid or of a solution in water irritates mouth, throat, and stomach and may cause death.

Fire Hazard

Behavior in Fire: Changes to formaldehyde gas, which is highly flammable.

Safety Profile

Moderately toxic by ingestion. A severe eye and skin irritant. Mutation data reported. Flammable when exposed to heat or flame; can react with oxidzing materials. To fight fire, use alcohol foam, COr, dry chemical. Incompatible with liquid oxygen. Dangerous; when heated to decomposition it emits toxic formaldehyde gas. See also FORMALDEHYDE.

Potential Exposure

Paraformaldehyde is used in polyacetal resin manufacture; as a food additive; and as an odorless fuel.

Shipping

UN2213 Paraformaldehyde, Hazard Class: 4.1; Labels: 4.1-Flammable solid.

Incompatibilities

Paraformaldehyde dust forms an explosive mixture with air. Decomposes on contact with oxidizers, strong acids; acid fumes; and bases; with elevated temperatures, forming formaldehyde. May explode when heated. May explode on impact if peroxide contamination develops. Mixtures with hydrogen peroxide or liquid oxygen are explosives sensitive to heat, shock, or contact with lead.

Waste Disposal

Dissolve or mix the material with a combustible solvent and burn in a chemical incinerator equipped with an afterburner and scrubber. All federal, state, and local environmental regulations must be observed.

Global( 715)Suppliers
Supplier Tel Email Country ProdList Advantage
Shanxi Naipu Import and Export Co.,Ltd
+86-13734021967 +8613734021967 kaia@neputrading.com China 1011 58
Hebei Mojin Biotechnology Co., Ltd
+86-13288715578 +86-13231137666 sales@hbmojin.com China 12409 58
Henan Bao Enluo International TradeCo.,LTD
+86-17331933971 +86-17331933971 deasea125996@gmail.com China 2504 58
Shanghai Bojing Chemical Co.,Ltd.
+86-86-02137122233 +8613795318958 bj1@bj-chem.com China 297 55
Henan Tianfu Chemical Co.,Ltd.
+86-0371-55170693 +86-19937530512 info@tianfuchem.com China 21703 55
Shanghai Time Chemicals CO., Ltd.
+86-021-57951555 +8617317452075 jack.li@time-chemicals.com China 1807 55
Hangzhou FandaChem Co.,Ltd.
008657128800458; +8615858145714 fandachem@gmail.com China 9359 55
ATK CHEMICAL COMPANY LIMITED
+undefined-21-51877795 ivan@atkchemical.com China 32480 60
Yancheng Green Chemicals Co.,Ltd
+undefined-86-25-86655873 info@royal-chem.com China 114 58
Wuhan Boyuan Import & Export Co., LTD
+86-15175982296 15175982296; Mike@whby-chem.com China 983 58

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View Lastest Price from Paraformaldehyde manufacturers

Image Update time Product Price Min. Order Purity Supply Ability Manufacturer
Paraformaldehyde pictures 2024-01-08 Paraformaldehyde
30525-89-4
US $1.00 / G 100G 99.9% 50000 tons Wuhan Boyuan Import & Export Co., LTD
Paraformaldehyde pictures 2023-09-06 Paraformaldehyde
30525-89-4
US $0.00-0.00 / KG 1KG 99% 500000kg Hebei Guanlang Biotechnology Co., Ltd.
paraformaldehyde pictures 2023-07-26 paraformaldehyde
30525-89-4
US $100.00 / kg 1kg 99% 500t/month Henan Bao Enluo International TradeCo.,LTD
  • Paraformaldehyde pictures
  • Paraformaldehyde
    30525-89-4
  • US $1.00 / G
  • 99.9%
  • Wuhan Boyuan Import & Export Co., LTD
  • Paraformaldehyde pictures
  • Paraformaldehyde
    30525-89-4
  • US $0.00-0.00 / KG
  • 99%
  • Hebei Guanlang Biotechnology Co., Ltd.
  • paraformaldehyde pictures
  • paraformaldehyde
    30525-89-4
  • US $100.00 / kg
  • 99%
  • Henan Bao Enluo International TradeCo.,LTD
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