Methanethiol

Guidance on Safe Use

First-aid measures

General advice:

Take off immediately all contaminated clothing

Inhalation: Move to fresh air. Oxygen or artificial respiration if needed. Keep under medical surveillance. In case of problems : Hospitalise.

Skin contact: Wash immediately, abundantly and thoroughly with water. Frostbite : treat as thermal burns

Eye contact: Wash immediately, abundantly and thoroughly with water. If irritation persists, consult an ophthalmologist.

Protection of first-aiders: In case of insufficient ventilation, wear suitable respiratory equipment.

Fire-fighting measures

Suitable extinguishing media: Carbon dioxide (CO2), Dry powder

Unsuitable extinguishing media: Foam

Specific hazards: Extremely flammable, Possible re-ignition of vapours from a distance, Thermal decomposition giving flammable and toxic products, Hydrogen sulphide, Sulphur oxides, Carbon oxides

Specific methods: Cool containers / tanks with water spray. Prohibit all sources of sparks and ignition - Do not smoke.

Special protective actions for fire-fighters: Wear self-contained breathing apparatus and protective suit.

Accidental release measures

Personal precautions, protective equipment and emergency procedures:

Prohibit all sources of sparks and ignition - Do not smoke. Avoid contact with the skin and the eyes. Prohibit inhalation of vapours

Evacuate non-essential staff and those not equipped with individual protection apparatus. Use personal protective equipment.

In case of leak, wear a self-contained breathing apparatus If possible position the leaking point uppermost If safe to do so, plug or seal off leak

Environmental precautions:

Do not release into the environment Pump into a labelled inert emergency tank.

Methods and materials for containment and cleaning up: Dam up with sand or inert earth (do not use combustible materials).

Recovery: Pump into a labelled inert emergency tank

Elimination: Destroy product by oxidation with dilute solutions of : Hydrogen peroxide sodium hypochlorite or Destroy the product by incineration (in accordance with local and national regulations).

Handling and storage

Precautions for safe handling:

Storage and handling precautions applicable to products: Liquefied gas extremely flammable forming explosive mixtures with air , toxic, dangerous for the environment  Provide appropriate exhaust ventilation at machinery. Provide showers, eye-baths. Provide self-contained breathing apparatus nearby. Well ventilate empty vats and tanks before entering.

Safe handling advice: Prohibit all sources of sparks and ignition - Do not smoke. Avoid the accumulation of gas at the lowest points. Take precautionary measures against static discharges. Do not use air for transfers. Open drum carefully as content may be under pressure. Keep well away from naked flames

Hygiene measures: Avoid contact with the skin and the eyes. Prohibit inhalation of vapours Smoking, eating and drinking should be prohibited in the application area.Wash hands after handling.Remove contaminated clothing and protective equipment before entering eating areas.

Conditions for safe storage, including any incompatibilities: Keep containers tightly closed in a cool, well-ventilated place. Store away from heat and ignition sources. Provide a catch-tank in a bunded area Provide electrical earthing of equipment and electrical equipment usable in explosive atmospheres.Do not store above: 50 °C

Incompatible products: Acids, Bases, Mercurous oxide, Strong oxidizing agents

Packaging material:

Recommended: Ordinary steel, Stainless steel

Joints : polyethylene, Rilsan ®, polytetrafluoroethylene (PTFE)

To be avoided: Copper and copper alloys, Iron (non passified)

Transport information

Land transport (UN RTDG/ADR/RID)

UN number:

UN 1064
Hazard N° 263

Shipping information

Proper shipping name and description:

METHYL MERCAPTAN

Language:

English

Labels:

2.3 (2.1)

SpecialProvisions

Inland waterway transport (UN RTDG/ADN(R))

UN number:

1064

Shipping information

Proper shipping name and description:

METHYL MERCAPTAN

Language:

English

Labels:

2.3 (2.1)

Remarks

Marine transport (UN RTDG/IMDG)

UN number:

1064

Shipping information

Proper shipping name and description:

METHYL MERCAPTAN

Labels:

2.3 (2.1)

Marine pollutant

Remarks

Air transport (UN RTDG/ICAO/IATA)

UN number:

1064

Shipping information

Proper shipping name and description:

METHYL MERCAPTAN

Special provisions / remarks

Remarks:

Transport prohibited

SpecialProvisions

Exposure controls / personal protection

CONTROL PARAMETERS:

Exposure Limit Values

Methanethiol    

Source       Date       Value type       Value(ppm)       Value(mg/m3)       Remarks

INRS (FR)       01 2008       VME            0,5            1        Indicative limit (VL)

ACGIH (US)       2007       TWA            0,5            –        –

Methanol

Source       Date       Value type       Value(ppm)       Value(mg/m3) Remarks

INRS (FR)       01 2008       VME          200          260        Regulatory binding (VRC)

INRS (FR)       01 2008       SKIN_DES       –       –        Can be absorbed through the skin.

INRS (FR)       01 2008       VLE         1.000         1.300        Regulatory binding (VRC)

ACGIH (US)       2007       TWA          200       –       –

ACGIH (US)       2007       STEL          250       –       –

ACGIH (US)       2007       SKIN_DES       –       –        Can be absorbed through the skin.

For monitoring procedures refer to for instance to the American  "Occupational Safety and Health Administration" Manual of Analytical Methods (OSHA 26).

Personal protective equipment:

Respiratory protection:       Low concentrations or short activity: Self contained Breathing Apparatus

                                 High concentrations or prolonged activity: On line apparatus

Hand protection:       Splash contact, intermittent and prolonged : Gloves nitrile rubber Glove thickness: 0,75 mm

Eye protection:       Safety glasses

Skin and body protection:       At the workplace: Combination with delayed penetration

                                 Intervention at incident: Combination with delayed penetration - anti-acid suit

                                

This substance is handled under Strictly Controlled Conditions in accordance with  REACH regulation Article 17(3) for on-site isolated intermediates and, in case the substance is transported to other sites for further processing, the substance should be handled at these sites under the Strictly Controlled Conditions as specified in REACH regulation Article 18(4).

Stability and reactivity

Conditions to avoid:

Keep away from heat and sources of ignition.

Do not store above: 50 °C

Materials to avoid: Strong oxidizing agents, Hydrogen peroxide, Nitric acid, Hypochlorites,

                                Reacts violently with : Acids, Bases, Mercurous oxide

Thermal decomposition: >  540 °C

Hazardous decomposition products:

Thermal decomposition giving flammable and toxic products, Hydrogen sulphide,

Formation of toxic products through combustion:, Sulphur oxides, Carbon oxides

Disposal considerations

Disposal of product:       

Destroy product by oxidation with dilute solutions of :  sodium hypochlorite Hydrogen peroxide or Destroy the product by incineration (in accordance with local and national regulations).