Isocyanic acid
- CAS No.
- 75-13-8
- Chemical Name:
- Isocyanic acid
- Synonyms
- HNCO;Hydrogen isocyanate;Polyisocyanates;75-13-8 ISOCYANIC ACID;HN=C=O;IL 1451 BA;IL 1351 BA;Isocyanato;Carbonimide;Isocyanicaci
- CBNumber:
- CB5512401
- Molecular Formula:
- CHNO
Lewis structure
- Molecular Weight:
- 43.02
- MDL Number:
- MOL File:
- 75-13-8.mol
- MSDS File:
- SDS
| Melting point | -86 °C |
|---|---|
| Boiling point | 41.91°C (rough estimate) |
| Density | 1.04±0.1 g/cm3(Predicted) |
| refractive index | 1.4300 (estimate) |
| PH | 3.35(1 mM solution);2.76(10 mM solution);2.23(100 mM solution) |
| Specific Heat Capacity | Cp(gas): 1.04 J/(g·K), at 25℃ |
| Henry's Law Constant | 2.0×10-1 mol/(m3Pa) at 25℃, Roberts and Liu (2019) |
| InChI | InChI=1S/CHNO/c2-1-3/h2H |
| InChIKey | OWIKHYCFFJSOEH-UHFFFAOYSA-N |
| SMILES | N=C=O |
| FDA UNII | QKG6U31925 |
| EPA Substance Registry System | Isocyanic acid (75-13-8) |
SAFETY
Risk and Safety Statements
| Symbol(GHS) |    GHS08,GHS07,GHS05 |
|---|---|
| Signal word | Danger |
| Hazard statements | H314-H335-H332-H302-H312-H334 |
| Precautionary statements | P264-P270-P301+P312-P330-P501-P260-P264-P280-P301+P330+P331-P303+P361+P353-P363-P304+P340-P310-P321-P305+P351+P338-P405-P501-P280-P302+P352-P312-P322-P363-P501-P261-P285-P304+P341-P342+P311-P501-P261-P271-P304+P340-P312 |
Isocyanic acid Chemical Properties, Uses, Production
Chemical Properties
Isocyanic acid (HNCO) is a volatile, moderately acidic compound, and the simplest member of the isocyanate family.
Isocyanic acid is a colourless, volatile, poisonous inorganic compound with the formula HNCO; the simplest stable chemical compound that contains carbon, hydrogen, nitrogen, and oxygen, the four most commonly-found elements in organic chemistry and biology. It is a hydracid and a one-carbon compound. It is a conjugate acid of a cyanate. It is a tautomer of a cyanic acid.
Physical properties
Isocyanic acid (ICA, Cas no. 75-13- 8) is a strong organic acid with a kPa of 3.5. ICA is a very reactive compound that can readily transform into other substances. It can lose a proton in an aqueous environment under certain conditions, particularly if a strong base is present, forming an isocyanate. ICA is a tautomer of the less stable, cyanic acid (CAS no. 420-05-3). These forms interchange by a tautomerisation reaction, involving the migration of a hydrogen atom or proton accompanied by a switch of a double bond. ICA is an unstable liquid above 0o C with a tendency to polymerise. The primary polymerisation product, which is also generated in the gas form, is cyanuric acid (CAS no. 108-80-5), a cyclic trimer. ICA is soluble in water, but disintegrates both via ionisation and by formation of ammonia and carbon dioxide.
Uses
The primary use of methyl isocyanate (MIC, CAS no. 624-83-9) is as a chemical intermediate in the production of carbamate pesticides. MIC is also used to produce polyurethane foam and plastics (ATSDR, 2002). Isocyanic acid (ICA, Cas no. 75-13- 8) does not have commercial uses because of its instability. The potential for occupational exposure to ICA largely arises when it is generated as a thermal degradation product of other industrial processes. Ethyl isocyanate is a liquid used commercially to make pharmaceuticals and pesticides (NJDHSS, 2000). Phenyl isocyanate (PIC, CAS no. 103-71-9) is a trace constituent in commercial diphenyl methane diisocyanate products.
Preparation
Isocyanic acid was prepared in pure form by reaction of KOCN or NaOCN with stearic or oxalic acid in good yield.
Definition
ChEBI: A colourless, volatile, poisonous inorganic compound with the formula HNCO; the simplest stable chemical compound that contains carbon, hydrogen, nitrogen, and oxygen, the four most commonly-found elements in organic chemistry and biology.
Hazard
Severe explosion risk. Strong irritant to eyes, skin and mucous membranes.
Isocyanic acid Preparation Products And Raw materials
Raw materials
Preparation Products
Isocyanic acid Suppliers
| Supplier | Tel | Country | ProdList | Advantage | |
|---|---|---|---|---|---|
| -W&Y Express Chemical Industry Co., Ltd (ShenYang) | 024-31124838 15840046119 | hxwdonald@wzeti.com | China | 497 | 58 |
| Wuhan xinyangruihe Chemical Technology Co., Ltd. | 027-18120580375 18120580375 | 669797270@qq.com | China | 6519 | 58 |
| Tianjin Zhongxin Chemtech Co., Ltd. | 022-66880623 | sales@tjzxchem.com | China | 612 | 60 |
| Syntechem Co.,Ltd | info@syntechem.com | China | 12973 | 57 | |
| China Langchem Inc. | 0086-21-58956006 | China | 7798 | 57 | |
| Beijing HuaMeiHuLiBiological Chemical | 010-56205725 | waley188@sohu.com | China | 12323 | 58 |
| Shanghai Macklin Biochemical Co.,Ltd. | 15221275939 15221275939 | shenlinxing@macklin.cn | China | 15775 | 55 |
| Jiangsu Aikon Biopharmaceutical R&D co.,Ltd. | 025-66028182 17714375163 | yftan@aikonchem.com | China | 16674 | 50 |
| Hubei Jusheng Technology Co.,Ltd | 027-59599241 18871490274 | 1400878000@qq.com | China | 9491 | 58 |
| Watson Biotechnology Co.,Ltd | 027-59207879 1972026995 18140587686 | sales@3600chem.com | China | 4149 | 55 |
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- May 28,2026
View Latest Price from Isocyanic acid manufacturers
| Image | Update time | Product | Price | Min. Order | Purity | Supply Ability | Manufacturer | |
|---|---|---|---|---|---|---|---|---|
 |
2026-10-13 | Isocyanic acid
75-13-8
|
0.99 | RongNa Biotechnology Co.,Ltd | ||||
 |
2026-10-13 | ISOCYANIC ACID
75-13-8
|
$800.00-990.00 | 1ton | 99% | 5000 | HEBEI SHENGSUAN CHEMICAL INDUSTRY CO.,LTD | |
 |
2026-08-21 | ISOCYANIC ACID
75-13-8
|
$80.00-88.00 | 10kilograms | 99% | 100tons | Hebei Dangtong Import and export Co LTD |
-
- Isocyanic acid
75-13-8
- 0.99
- RongNa Biotechnology Co.,Ltd
-
- ISOCYANIC ACID
75-13-8
- $800.00-990.00
- 99%
- HEBEI SHENGSUAN CHEMICAL INDUSTRY CO.,LTD
-
- ISOCYANIC ACID
75-13-8
- $80.00-88.00
- 99%
- Hebei Dangtong Import and export Co LTD
