CAS No. 96-45-7

Formula: C3H6N2S
Basic Info

Ethylene thiourea is an organosulfur compound. It is an example of an N,N-disubstituted thiourea.
This compound is synthesized by treating ethylenediamine with carbon disulfide.

Molecular Weight
Exact Mass







2-thioxo imidazolidine





ethylene thiourea

NA 22

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Appearance & Physical State
White to pale green crystalline powder
Boiling Point
148.3ºC at 760 mmHg
Melting Point
Flash Point
Refractive Index
Water Solubility
19 g/L (20 ºC)
Stable under normal temperatures and pressures.
Storage Condition
Safety Info
Safety Statements
WGK Germany
Risk Statements
R22; R61
HS Code
Hazard Class
Packing Group
Caution Statement
P201; P281; P308 + P313
Hazard Codes
Hazard Declaration
Caution Statement
SDS 1.0
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According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 12, 2017

Revision Date: Aug 12, 2017


1.1 GHS Product identifier

Product name 2-Imidazolidinethione

1.2 Other means of identification

Product number -
Other names 2-Imidazolidinethione

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only. Ethylene thiourea is used as an accelerator in synthetic rubber production and as a curing agent for epichlorohydrin elastomers. Ethylene thiourea is also a component of ethylenebisdithiocarbamate fungicides.
Uses advised against no data available

1.4 Supplier's details

Company MOLBASE (Shanghai) Biotechnology Co., Ltd.
Address Floor 4 & 5, Building 12, No. 1001 North Qinzhou Road,
Xuhui District, Shanghai, China
Telephone +86(21)64956998
Fax +86(21)54365166

1.5 Emergency phone number

Emergency phone number +86-400-6021-666
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

2.Hazard identification

2.1 Classification of the substance or mixture

Acute toxicity - Oral, Category 4

Reproductive toxicity, Category 1B

2.2 GHS label elements, including precautionary statements

Signal word


Hazard statement(s)

H302 Harmful if swallowed

Precautionary statement(s)

P264 Wash ... thoroughly after handling.

P270 Do not eat, drink or smoke when using this product.

P201 Obtain special instructions before use.

P202 Do not handle until all safety precautions have been read and understood.

P280 Wear protective gloves/protective clothing/eye protection/face protection.


P301+P312 IF SWALLOWED: Call a POISON CENTER/doctor/…if you feel unwell.

P330 Rinse mouth.

P308+P313 IF exposed or concerned: Get medical advice/ attention.


P405 Store locked up.


P501 Dispose of contents/container to ...

2.3 Other hazards which do not result in classification


3.Composition/information on ingredients

3.1 Substances

Chemical name Common names and synonyms CAS number EC number Concentration
2-Imidazolidinethione 2-Imidazolidinethione 96-45-7 none 100%

4.First-aid measures

4.1 Description of necessary first-aid measures

General advice

Consult a physician. Show this safety data sheet to the doctor in attendance.

If inhaled

Fresh air.

In case of skin contact

Rinse skin with plenty of water or shower.

In case of eye contact

Rinse with plenty of water (remove contact lenses if easily possible).

If swallowed

Rinse mouth. Seek medical attention if you feel unwell.

4.2 Most important symptoms/effects, acute and delayed

Exposure Routes: inhalation, ingestion, skin and/or eye contact Symptoms: Irritation eyes Target Organs: Eyes, skin, thyroid, reproductive system (NIOSH, 2016)

4.3 Indication of immediate medical attention and special treatment needed, if necessary

/SRP:/ Immediate first aid: Ensure that adequate decontamination has been carried out. If patient is not breathing, start artificial respiration, preferably with a demand valve resuscitator, bag-valve-mask device, or pocket mask, as trained. Perform CPR if necessary. Immediately flush contaminated eyes with gently flowing water. Do not induce vomiting. If vomiting occurs, lean patient forward or place on the left side (head-down position, if possible) to maintain an open airway and prevent aspiration. Keep patient quiet and maintain normal body temperature. Obtain medical attention. /Poisons A and B/

5.Fire-fighting measures

5.1 Extinguishing media

Suitable extinguishing media

Use dry chemical, carbon dioxide, water spray, or foam extinguishers ... If material or contaminated runoff enters waterways, notify downstream users of potentially contaminated waters. Notify local health and fire officials and pollution control agencies. From a secure, explosion-proof location, use water spray to cool exposed containers. If cooling streams are ineffective (venting sound increases in volume and pitch, tank discolors or shows any signs of deforming), withdraw immediately to a secure position.

5.2 Specific hazards arising from the chemical

This chemical is combustible.

5.3 Special protective actions for fire-fighters

Wear self-contained breathing apparatus for firefighting if necessary.

6.Accidental release measures

6.1 Personal precautions, protective equipment and emergency procedures

Use personal protective equipment. Avoid dust formation. Avoid breathing vapours, mist or gas. Ensure adequate ventilation. Evacuate personnel to safe areas. Avoid breathing dust. For personal protection see section 8.

6.2 Environmental precautions

Personal protection: particulate filter respirator adapted to the airborne concentration of the substance. Do NOT let this chemical enter the environment. Sweep spilled substance into covered sealable containers. If appropriate, moisten first to prevent dusting. Carefully collect remainder. Then store and dispose of according to local regulations.

6.3 Methods and materials for containment and cleaning up

SRP: Wastewater from contaminant suppression, cleaning of protective clothing/equipment, or contaminated sites should be contained and evaluated for subject chemical or decomposition product concentrations. Concentrations shall be lower than applicable environmental discharge or disposal criteria. Alternatively, pretreatment and/or discharge to a permitted wastewater treatment facility is acceptable only after review by the governing authority and assurance that "pass through" violations will not occur. Due consideration shall be given to remediation worker exposure (inhalation, dermal and ingestion) as well as fate during treatment, transfer and disposal. If it is not practicable to manage the chemical in this fashion, it must be evaluated in accordance with EPA 40 CFR Part 261, specifically Subpart B, in order to determine the appropriate local, state and federal requirements for disposal.

7.Handling and storage

7.1 Precautions for safe handling

Avoid contact with skin and eyes. Avoid formation of dust and aerosols. Avoid exposure - obtain special instructions before use.Provide appropriate exhaust ventilation at places where dust is formed. For precautions see section 2.2.

7.2 Conditions for safe storage, including any incompatibilities

Separated from strong oxidants. Store in an area without drain or sewer access.Store in tightly closed containers in a cool, well ventilated area away from strong oxidizers, acids, acid anhydrides, acrolein. Store in a refrigerator or a cool, dry place. A regulated marked area should be established where this chemical is handled, used, or stored ...

8.Exposure controls/personal protection

8.1 Control parameters

Occupational Exposure limit values

NIOSH considers ethylene thiourea to be a potential occupational carcinogen.

NIOSH usually recommends that occupational exposures to carcinogens be limited to the lowest feasible concentration.

Use encapsulated form.

Biological limit values

no data available

8.2 Appropriate engineering controls

Handle in accordance with good industrial hygiene and safety practice. Wash hands before breaks and at the end of workday.

8.3 Individual protection measures, such as personal protective equipment (PPE)

Eye/face protection

Safety glasses with side-shields conforming to EN166. Use equipment for eye protection tested and approved under appropriate government standards such as NIOSH (US) or EN 166(EU).

Skin protection

Wear impervious clothing. The type of protective equipment must be selected according to the concentration and amount of the dangerous substance at the specific workplace. Handle with gloves. Gloves must be inspected prior to use. Use proper glove removal technique(without touching glove's outer surface) to avoid skin contact with this product. Dispose of contaminated gloves after use in accordance with applicable laws and good laboratory practices. Wash and dry hands. The selected protective gloves have to satisfy the specifications of EU Directive 89/686/EEC and the standard EN 374 derived from it.

Respiratory protection

Wear dust mask when handling large quantities.

Thermal hazards

no data available

9.Physical and chemical properties

Physical state White to pale green crystalline powder
Colour Needles, prisms from alcohol or amyl alcohol
Odour Faint, amine odor
Melting point/ freezing point 15°C(lit.)
Boiling point or initial boiling point and boiling range 275°C(lit.)
Flammability Combustible SolidCombustible. Gives off irritating or toxic fumes (or gases) in a fire.
Lower and upper explosion limit / flammability limit no data available
Flash point 61°C(lit.)
Auto-ignition temperature no data available
Decomposition temperature no data available
pH no data available
Kinematic viscosity no data available
Solubility In water:19 g/L (20 ºC)
Partition coefficient n-octanol/water (log value) log Kow = -0.66
Vapour pressure less than 1 mm Hg at 20°C
Density and/or relative density 1.41~1.45
Relative vapour density no data available
Particle characteristics no data available

10.Stability and reactivity

10.1 Reactivity

no data available

10.2 Chemical stability

Stable under recommended storage conditions.

10.3 Possibility of hazardous reactions

Dust explosion possible if in powder or granular form, mixed with air.ETHYLENE THIOUREA may be sensitive to prolonged exposure to light. Incompatible with acids, diazo and azo compounds, halocarbons, isocyanates, aldehydes, alkali metals, nitrides, hydrides, and other strong reducing agents. Reactions with these materials generate heat and in many cases hydrogen gas. May react with acids to liberate hydrogen sulfide.

10.4 Conditions to avoid

no data available

10.5 Incompatible materials

Strong oxidizers, acids, acid anhydrides, acrolein.

10.6 Hazardous decomposition products

When heated to decomposition it emits very toxic fumes of /nitroxides/ and /sulfoxides/.

11.Toxicological information

Acute toxicity

  • Oral: LD50 Rat oral 545 mg/kg bw
  • Inhalation: no data available
  • Dermal: no data available

Skin corrosion/irritation

no data available

Serious eye damage/irritation

no data available

Respiratory or skin sensitization

no data available

Germ cell mutagenicity

no data available


Cancer Classification: Group B2 Probable Human Carcinogen

Reproductive toxicity

In an occupational study, reproductive or developmental effects were not observed in humans. Ethylene thiourea has been shown to be a potent teratogen in rats orally or dermally exposed, causing CNS and skeletal abnormalities.

STOT-single exposure

no data available

STOT-repeated exposure

no data available

Aspiration hazard

no data available

12.Ecological information

12.1 Toxicity

  • Toxicity to fish: EC50; Species: Oncorhynchus mykiss (Rainbow trout, fertilized egg- early fry stage); Conditions: freshwater, renewal, 10°C, pH 7.7, hardness 50 mg/L CaCO3; Concentration: 1000000 ug/L for 60 days (95% confidence interval: 600000-3200000 ug/L); Effect: morphological abnormalities /> or =99% purity
  • Toxicity to daphnia and other aquatic invertebrates: LC50; Species: Daphnia magna (Water flea); Conditions: freshwater, renewal; Concentration: 26400 ug/L for 48 hr (95% confidence interval: 21600-32200 ug/L) /99% purity
  • Toxicity to algae: no data available
  • Toxicity to microorganisms: no data available

12.2 Persistence and degradability

AEROBIC: Ethylene thiourea was found to be readily degraded by soil microorganisms(1). Ethylene thiourea degraded rapidly in soil to ethyleneurea and then CO2; however, studies with autoclaved soil indicated that initial conversion was accomplished chemically(2) while further degradation to CO2 was accomplished microbially(3). Ethylene thiourea was shown to be biodegradable in aerobic soil samples from a sandy locality in western Jylland, Denmark at a concentration 125 ug/L incubated in the dark at 23°C for 120 days(4). Aerobic decay rates were 11.4 to 13.3 ug/kg soil-day(4). Degradation of 0.07 mg/kg 14C-labeled ethylene thiourea was determined in surface (19% in 24 hrs) coarse sandy field soil from Denmark(5). Subsurface rates were affected by soil depth; 16% and 23% at 100 and 60 cm depth, respectively, after 109 days. Following a 5 day incubation of 0.05 mg/L ethylene thiourea in activated sludge, 2.9% of applied amount was degraded(5). Ethylene thiourea, present at 100 mg/L, reached 0% of its theoretical BOD in 4 weeks using an activated sludge inoculum at 30 mg/L and the Japanese MITI test(6).

12.3 Bioaccumulative potential

BCFs of <0.2 to 0.3 and <1.8 were determined in carp (Cyprinus carpio) for ethylene thiourea at concentrations of 1.0 and 0.1 ppm exposed for 6 weeks(1). According to a classification scheme(2), these BCFs suggest bioconcentration in aquatic organisms is low(SRC).

12.4 Mobility in soil

Using a structure estimation method based on molecular connectivity indices(1), the Koc of ethylene thiourea can be estimated to be 13(SRC). According to a classification scheme(2), this estimated Koc value suggests that ethylene thiourea is expected to have very high mobility in soil. Average Rf values of 0.96 (Norfolk sandy loam), 1.00 (Lakeland sandy loam), 0.96 (Hagerstown silty clay loam), 0.83 (Barnes clay loam) and 0.61 (Celeryville muck) were measured using soil TLC plates which is indicative of high mobility in all the soils except the muck which has intermediate mobility(3). Ethylene thiourea Kd values were measured in Dutch soils from Fladerne Baek, March 1994; 0.06 (2.1% clay, 1.4% silt, 96.3% sand, 0.1% humus, pH 6.4), 0.13 (2.5% clay, 1.4% silt, 95.7% sand, 0.3% humus, pH 6.3), 0.17 (3.6% clay, 2.8% silt, 90.8% sand, 2.8% humus, pH 6.9)(4).

12.5 Other adverse effects

no data available

13.Disposal considerations

13.1 Disposal methods


The material can be disposed of by removal to a licensed chemical destruction plant or by controlled incineration with flue gas scrubbing. Do not contaminate water, foodstuffs, feed or seed by storage or disposal. Do not discharge to sewer systems.

Contaminated packaging

Containers can be triply rinsed (or equivalent) and offered for recycling or reconditioning. Alternatively, the packaging can be punctured to make it unusable for other purposes and then be disposed of in a sanitary landfill. Controlled incineration with flue gas scrubbing is possible for combustible packaging materials.

14.Transport information

14.1 UN Number

ADR/RID: UN1325 IMDG: UN1325 IATA: UN1325

14.2 UN Proper Shipping Name


14.3 Transport hazard class(es)

ADR/RID: 4.1 IMDG: 4.1 IATA: 4.1

14.4 Packing group, if applicable


14.5 Environmental hazards

ADR/RID: no IMDG: no IATA: no

14.6 Special precautions for user

no data available

14.7 Transport in bulk according to Annex II of MARPOL 73/78 and the IBC Code

no data available

15.Regulatory information

15.1 Safety, health and environmental regulations specific for the product in question

Chemical name Common names and synonyms CAS number EC number
2-Imidazolidinethione 2-Imidazolidinethione 96-45-7 none
European Inventory of Existing Commercial Chemical Substances (EINECS) Listed.
EC Inventory Listed.
United States Toxic Substances Control Act (TSCA) Inventory Listed.
China Catalog of Hazardous chemicals 2015 Not Listed.
New Zealand Inventory of Chemicals (NZIoC) Listed.
Philippines Inventory of Chemicals and Chemical Substances (PICCS) Listed.
Vietnam National Chemical Inventory Listed.
Chinese Chemical Inventory of Existing Chemical Substances (China IECSC) Listed.

16.Other information

Information on revision

Creation Date Aug 12, 2017
Revision Date Aug 12, 2017

Abbreviations and acronyms

  • CAS: Chemical Abstracts Service
  • ADR: European Agreement concerning the International Carriage of Dangerous Goods by Road
  • RID: Regulation concerning the International Carriage of Dangerous Goods by Rail
  • IMDG: International Maritime Dangerous Goods
  • IATA: International Air Transportation Association
  • TWA: Time Weighted Average
  • STEL: Short term exposure limit
  • LC50: Lethal Concentration 50%
  • LD50: Lethal Dose 50%
  • EC50: Effective Concentration 50%


  • IPCS - The International Chemical Safety Cards (ICSC), website: http://www.ilo.org/dyn/icsc/showcard.home
  • HSDB - Hazardous Substances Data Bank, website: https://toxnet.nlm.nih.gov/newtoxnet/hsdb.htm
  • IARC - International Agency for Research on Cancer, website: http://www.iarc.fr/
  • eChemPortal - The Global Portal to Information on Chemical Substances by OECD, website: http://www.echemportal.org/echemportal/index?pageID=0&request_locale=en
  • CAMEO Chemicals, website: http://cameochemicals.noaa.gov/search/simple
  • ChemIDplus, website: http://chem.sis.nlm.nih.gov/chemidplus/chemidlite.jsp
  • ERG - Emergency Response Guidebook by U.S. Department of Transportation, website: http://www.phmsa.dot.gov/hazmat/library/erg
  • Germany GESTIS-database on hazard substance, website: http://www.dguv.de/ifa/gestis/gestis-stoffdatenbank/index-2.jsp
  • ECHA - European Chemicals Agency, website: https://echa.europa.eu/

Disclaimer: The above information is believed to be correct but does not purport to be all inclusive and shall be used only as a guide. The information in this document is based on the present state of our knowledge and is applicable to the product with regard to appropriate safety precautions. It does not represent any guarantee of the properties of the product. We as supplier shall not be held liable for any damage resulting from handling or from contact with the above product.
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Name: 2-Imidazolidinethione paraffinic oil coated powder Material Safety Data Sheet
Synonym: Ethylenethiourea; Imidazoline-2-thiol
CAS: 96-45-7
Section 1 - Chemical Product   MSDS Name:2-Imidazolidinethione paraffinic oil coated powder Material Safety Data Sheet
Synonym:Ethylenethiourea; Imidazoline-2-thiol

CAS# Chemical Name content EINECS#
96-45-7 2-Imidazolidinethione 98 202-506-9
Hazard Symbols: T
Risk Phrases: 22 61

Harmful if swallowed. May cause harm to the unborn child.
Potential Health Effects
Causes eye irritation.
Causes skin irritation. May cause allergic sensitization in certain individuals.
May cause gastrointestinal irritation with nausea, vomiting and diarrhea. May be harmful if swallowed. Rapidly absorbed when ingested and disseminated throughout the body.
Causes irritation of the mucous membrane and upper respiratory tract.
Possible cancer hazard based on tests with laboratory animals.
Laboratory experiments have resulted in mutagenic effects. May be rapidly transferred across the placenta and cause adverse fetal effects.

  Eyes: Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.
Get medical aid. Immediately flush skin with plenty of water for at least 15 minutes while removing contaminated clothing and shoes.
Wash clothing before reuse.
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.
Remove from exposure and move to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
Notes to Physician:
Treat symptomatically and supportively.

  General Information:
As in any fire, wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. This material in sufficient quantity and reduced particle size is capable of creating a dust explosion.
Extinguishing Media:
Use agent most appropriate to extinguish fire. Use water spray, dry chemical, carbon dioxide, or appropriate foam.

  General Information: Use proper personal protective equipment as indicated in Section 8.
Vacuum or sweep up material and place into a suitable disposal container. Clean up spills immediately, observing precautions in the Protective Equipment section. Avoid generating dusty conditions.
Provide ventilation.

Section 7 - HANDLING and STORAGE
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use only in a well-ventilated area. Minimize dust generation and accumulation. Avoid breathing dust, vapor, mist, or gas. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation. Wash clothing before reuse.
Keep container closed when not in use. Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.

  Engineering Controls:
Facilities storing or utilizing this material should be equipped with an eyewash facility and a safety shower. Use adequate ventilation to keep airborne concentrations low.
Exposure Limits CAS# 96-45-7: Netherlands: 0.024 mg/m3 MAC Personal Protective Equipment 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.
Wear appropriate protective gloves to prevent skin exposure.
Wear appropriate protective clothing to prevent skin exposure.
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 respirator use.

Physical State: Crystalline powder
Color: off-white
Odor: faint odor - amine-like
pH: Not available.
Vapor Pressure: Not available.
Viscosity: Not available.
Boiling Point: Not available.
Freezing/Melting Point: 198-204 deg C
Autoignition Temperature: Not applicable.
Flash Point: Not applicable.
Explosion Limits, lower: Not available.
Explosion Limits, upper: Not available.
Decomposition Temperature:
Solubility in water: Soluble.
Specific Gravity/Density:
Molecular Formula: C3H6N2S
Molecular Weight: 102.15

  Chemical Stability:
Stable under normal temperatures and pressures.
Conditions to Avoid:
Incompatible materials, dust generation, excess heat, strong oxidants.
Incompatibilities with Other Materials:
Acrolein, strong oxidizing agents.
Hazardous Decomposition Products:
Nitrogen oxides, carbon monoxide, oxides of sulfur, irritating and toxic fumes and gases, carbon dioxide, nitrogen.
Hazardous Polymerization: Has not been reported.

CAS# 96-45-7: NI9625000 LD50/LC50:
CAS# 96-45-7: Draize test, rabbit, eye: 500 mg/24H Mild; Oral, mouse: LD50 = 3 gm/kg; Oral, rat: LD50 = 1832 mg/kg.
2-Imidazolidinethione - California: carcinogen, initial date 1/1/88 NTP: Suspect carcinogen Other:
See actual entry in RTECS for complete information.

Fish: Goldfish: LC50 = 7500 mg/L; 96 Hr; Static bioassayWater flea Daphnia: EC50 = 26.4 mg/L; 48 Hr; Static bioassayBacteria: Phytobacterium phosphoreum: EC50 = 2080-2450 mg/L; 15 min; Microtox testIf released to soil, 2-Imidazolidinethione is readily degraded with half-lives of less than one week observed under field conditions. Although soil microorganisms can degrade 2-Imidazolidinethione, degradation in soil may be accomplished by chemical conversion to ethyleneurea followed by microbial attack. It is expected to be highly mobile in most wet soils with the exception of soils with high organic content. Strong adsorption and/or

  Dispose of in a manner consistent with federal, state, and local regulations.

Not regulated as a hazardous material.
Not regulated as a hazardous material.
Not regulated as a hazardous material.
USA RQ: CAS# 96-45-7: 10 lb final RQ; 4.54 kg final RQ

European/International Regulations
European Labeling in Accordance with EC Directives
Hazard Symbols: T
Risk Phrases:
R 61 May cause harm to the unborn child.
R 22 Harmful if swallowed.
Safety Phrases:
S 53 Avoid exposure - obtain special instructions
before use.
S 45 In case of accident or if you feel unwell, seek
medical advice immediately (show the label where
WGK (Water Danger/Protection)
CAS# 96-45-7: No information available.
CAS# 96-45-7 is listed on Canada's DSL List.
CAS# 96-45-7 is listed on Canada's Ingredient Disclosure List.
CAS# 96-45-7 is listed on the TSCA inventory.

NMR Spectrum 1H NMR : parameter in DMSO-d6
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IR Spectrum IR : KBr disc
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Mass Spectrum Mass spectrum (electron ionization)
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UV Spectrum UV/Visible spectrum
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