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Paraformaldehyde

Product Name
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
Formula Weight
30.03
MOL File
30525-89-4.mol
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Paraformaldehyde Property

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
EPA Substance Registry System
Paraformaldehyde (30525-89-4)
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Safety

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
Hazardous Substances Data
30525-89-4(Hazardous Substances Data)
Toxicity
LD50 orally in Rabbit: 592 mg/kg
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Hazard and Precautionary Statements (GHS)

Symbol(GHS)
Signal word
Danger
Hazard statements

H228Flammable solid

H315Causes skin irritation

H317May cause an allergic skin reaction

H318Causes serious eye damage

H335May cause respiratory irritation

H341Suspected of causing genetic defects

H350May cause cancer

Precautionary statements

P210Keep away from heat/sparks/open flames/hot surfaces. — No smoking.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P301+P312IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

P308+P313IF exposed or concerned: Get medical advice/attention.

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N-Bromosuccinimide Price

Sigma-Aldrich
Product number
8.18715
Product name
Paraformaldehyde
Purity
for synthesis
Packaging
100g
Price
$40.1
Updated
2024/03/01
Sigma-Aldrich
Product number
8.18715
Product name
Paraformaldehyde
Purity
for synthesis
Packaging
1kg
Price
$131
Updated
2024/03/01
Sigma-Aldrich
Product number
158127
Product name
Paraformaldehyde
Purity
powder, 95%
Packaging
5g
Price
$34.2
Updated
2024/03/01
Sigma-Aldrich
Product number
158127
Product name
Paraformaldehyde
Purity
powder, 95%
Packaging
3kg
Price
$210
Updated
2024/03/01
Sigma-Aldrich
Product number
1.04005
Product name
Paraformaldehyde
Purity
EMPROVE? ESSENTIAL, DAC
Packaging
1KG
Price
$53
Updated
2022/05/15
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Paraformaldehyde Chemical Properties,Usage,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.

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.

Definition

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

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.

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Paraformaldehyde Suppliers

Jinan Hongli Chemical Industry Co. , Ltd.
Tel
18354135979
Email
970731907@qq.com
Country
China
ProdList
87
Advantage
58
Jinan Yifei Technology and Trade Co. Ltd
Tel
0531-0531-88940339 13356650339
Email
770637950@qq.com
Country
China
ProdList
7
Advantage
58
Jinan Century Tongda Chemical Co., Ltd.
Tel
13370556116
Fax
0531-85917596
Email
3350933950@qq.com
Country
China
ProdList
353
Advantage
58
Shanghai Aladdin Bio-Chem Technology Co.,LTD
Tel
400-400-6206333 18521732826
Fax
021-50323701
Email
market@aladdin-e.com
Country
China
ProdList
25014
Advantage
65
TCI (Shanghai) Development Co., Ltd.
Tel
021-67121386
Fax
021-67121385
Email
Sales-CN@TCIchemicals.com
Country
China
ProdList
24539
Advantage
81
Shanghai Jizhi Biochemical Technology Co. Ltd.
Tel
400-400-400-9004166 18616739031
Email
3007523370@qq.com
Country
China
ProdList
52712
Advantage
58
Beijing Tianyukanghong Chemical Technology Co., Ltd.
Tel
010-57794770 13552605092
Fax
010-60593781
Email
tianyukanghong@163.com
Country
China
ProdList
343
Advantage
55
Wuhan Ji Ye Sheng Chemical Co., Ltd.
Tel
027-13545242311 13545242311
Email
2471076463@qq.com
Country
China
ProdList
498
Advantage
58
Nantong Zhonghe Chemical New Materials Co., Ltd
Tel
13003551299 13003551299
Email
2369399482@qq.com
Country
China
ProdList
7567
Advantage
58
Shandong Baiyang Biotechnology Co., Ltd
Tel
0533-13505335043 13505335043
Email
jinqiu9966@163.com
Country
China
ProdList
81
Advantage
58
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View Lastest Price from Paraformaldehyde manufacturers

Hebei Guanlang Biotechnology Co., Ltd.
Product
Paraformaldehyde 30525-89-4
Price
US $10.00/KG
Min. Order
1KG
Purity
99%
Supply Ability
10 mt
Release date
2021-04-09
Shaanxi Dideu Medichem Co. Ltd
Product
Paraformaldehyde 30525-89-4
Price
US $1.10/g
Min. Order
1g
Purity
99.0% min
Supply Ability
100 tons min
Release date
2021-05-25
Hebei Guanlang Biotechnology Co., Ltd.
Product
Paraformaldehyde 30525-89-4
Price
US $0.00-0.00/KG
Min. Order
1KG
Purity
99%
Supply Ability
500000kg
Release date
2023-03-17

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