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Dayang Chem (Hangzhou) Co., Ltd.
China
Product Name: Methyl fluorosulfonate
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421-20-5

421-20-5 structure

421-20-5 structure

Name: METHYL FLUOROSULFONATE
Chemical Name: Methyl Fluorosulfonate
CAS Number: 421-20-5
Molecular Formula: CH₃FO₃S
Molecular Weight: 114.09600
Catalog: Organic raw materials Inorganic acid ester
Create Date: 2018-03-10 08:00:00
Modify Date: 2026-07-21 10:23:57

Name	Methyl Fluorosulfonate
Synonyms	Fluoridosulfuric acid methyl ester FLUOROSULFONIC ACID METHYL ESTER fluorosulfonyloxymethane Methylfluorosulfonate,stab.withKF METHYL FLUOROSULPHONATE ( WITH KF) Fluorosulfuric Acid Methyl Ester MFCD00014721 methylfluorosulfate Methyl Fluorosulfate Methylfluorosulphonate Methyl Fluorosulfonate ( with KF) [for Esterification] Methyl Fluorosulfonate [for Esterification] Fluorosulfuricacidmethylester Methyl sulphurofluoridate Methyl fluorosulphate Methyl Sulfofluoridate EINECS 207-004-3 methylfluosulfonate Methyl fluorosulphonate magicmethyl Methyl sulphurofluoridoate, Methoxysulphonyl fluoride Methyl Fluorosulfate ( with KF) Fluorosulfonic Acid Methyl Ester ( with KF) fluorosulfuricacid,methylester Sulfuryl fluoride methyl ester Fluorosulfonic Acid Methyl Ester Fluorosulfonic Acid Methyl Ester Methyl Fluorosulfate Fluorosulfuric Acid Methyl Ester MethylFluorosulfonate(stabilizedwithKF)[forEsterification]>

Density	1.45
Boiling Point	93 °C
Melting Point	-95 °C
Molecular Formula	CH₃FO₃S
Molecular Weight	114.09600
Flash Point	10ºC
Exact Mass	113.97900
PSA	51.75000
LogP	0.92790
Vapour Pressure	57.3mmHg at 25°C
Index of Refraction	1.363

CHEMICAL IDENTIFICATION

RTECS NUMBER :: LP0720000

CHEMICAL NAME :: Fluorosulfuric acid, methyl ester

CAS REGISTRY NUMBER :: 421-20-5

BEILSTEIN REFERENCE NO. :: 1098714

LAST UPDATED :: 199710

DATA ITEMS CITED :: 8

MOLECULAR FORMULA :: C-H3-F-O3-S

MOLECULAR WEIGHT :: 114.10

WISWESSER LINE NOTATION :: WSFO1

HEALTH HAZARD DATA

ACUTE TOXICITY DATA

TYPE OF TEST :: Rinsed with water

ROUTE OF EXPOSURE :: Administration into the eye

SPECIES OBSERVED :: Rodent - rabbit

TYPE OF TEST :: LC50 - Lethal concentration, 50 percent kill

ROUTE OF EXPOSURE :: Inhalation

SPECIES OBSERVED :: Rodent - rat

DOSE/DURATION :: 5 ppm/1H

TOXIC EFFECTS :: Sense Organs and Special Senses (Eye) - lacrimation Behavioral - changes in motor activity (specific assay) Lungs, Thorax, or Respiration - dyspnea

TYPE OF TEST :: LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :: Oral

SPECIES OBSERVED :: Rodent - mouse

DOSE/DURATION :: 112 mg/kg

TOXIC EFFECTS :: Details of toxic effects not reported other than lethal dose value

TYPE OF TEST :: LDLo - Lowest published lethal dose

ROUTE OF EXPOSURE :: Administration onto the skin

SPECIES OBSERVED :: Rodent - rabbit

DOSE/DURATION :: 455 mg/kg

TOXIC EFFECTS :: Skin and Appendages - corrosive (after topical exposure)

MUTATION DATA

TYPE OF TEST :: Morphological transformation

TEST SYSTEM :: Rodent - hamster Kidney

DOSE/DURATION :: 25 ug/L

REFERENCE :: MUREAV Mutation Research. (Elsevier Science Pub. B.V., POB 211, 1000 AE Amsterdam, Netherlands) V.1- 1964- Volume(issue)/page/year: 51,285,1978

Hazard Codes	C
Risk Phrases	R34
Safety Phrases	S26-S36/37/39
RIDADR	3265
RTECS	LP0720000
HS Code	2915900090

HS Code	2915900090
Summary	2915900090 other saturated acyclic monocarboxylic acids and their anhydrides, halides, peroxides and peroxyacids; their halogenated, sulphonated, nitrated or nitrosated derivatives VAT:17.0% Tax rebate rate:9.0% Supervision conditions:AB(certificate of inspection for goods inward,certificate of inspection for goods outward) MFN tariff:5.5% General tariff:30.0%

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