DEC-----Storm Drains......

Only clean rainwater (with the exception of some permitted discharges) can be discharged to a storm drain. All work, construction, cleaning and other operations conducted outdoors must be carried out in a way that prevents wastewater and contamination such as trash, debris, dirt, construction materials and hazardous materials from entering storm drain systems.

Examples of waste water that cannot be discharged to a storm drain include:Wash water from construction operations including, but not limited to, wash water from painting, stripping, sanding, abrasion, drywall and concrete operations. Building washing operations Vehicle or equipment washing Sidewalk, plaza and parking structure cleaning .

5 IS ACCEPTABLE LEVEL----------------READS 60 PUMPED INTO SEWER ON CARLTON AVE BY THE TOWN!

NO WONDER THEY CALLED 911 FOR THE WATER TO BE TAKEN FROM ME!

 

Mesitylene or 1,3,5-trimethylbenzene (C9H12) is an aromatic hydrocarbon with three methyl substituents attached to the benzene ring. It is prepared by distillation of acetone with sulfuric acid or by trimerization of propyne in sulfuric acid, which, in both cases, acts as a catalyst and dehydrating agent. It is commonly used as a solvent in research and industry. It is flammable and an irritant; it is a low-freezing liquid.

In the electronics industry, mesitylene has also been used as a developer for photopatternable silicones due to its solvent properties.

1,3,5-Trimethylbenzene is also a major urban volatile organic compound (VOC) which results from combustion. It plays a significant role in aerosol and tropospheric ozone formation as well as other reactions in atmospheric chemistry.

The mesityl group (Mes) is a functional group found as an attachment in many organic compounds.

The three aromatic hydrogen atoms of mesitylene are in identical chemical shift environments. Therefore, they only give a single peak, with an integration of 3, near 6.8 ppm in the 1H NMR spectrum. For this reason, mesitylene is sometimes used as an internal standard in NMR samples that contain aromatic protons.[1] Mesitylene is the common name of 1,3,5-Trimethylbenzene (triply methylated benzene) occurring in petroleum and coal tar
SALES SPECIFICATION
APPEARANCE clear liquid
   
SOLUBILITY IN WATER Insoluble (miscible with alcohol, benzene, ether)
pH  
VAPOR DENSITY  
AUTOIGNITION 550 C
NFPA RATINGS Health: 1; Flammability: 2 ; Reactivity: 0
HAZARD CLASS 3 (Packing group: III) Safety data for mesitylene



Glossary of terms on this data sheet.

The information on this web page is provided to help you to work safely, but it is intended to be an overview of hazards, not a replacement for a full Material Safety Data Sheet (MSDS). MSDS forms can be downloaded from the web sites of many chemical suppliers. General

Synonyms: 1,3,5-trimethylbenzene
Molecular formula: C9H12
CAS No: 108-67-8
EC No: 203-604-4
Annex I Index No: 601-025-00-5 Physical data

Appearance: colourless liquid with an aromatic odour
Melting point: -45 C
Boiling point: 165 C
Vapour density: 4.15 ( air = 1 )
Vapour pressure: 1.86 mm Hg at 20 C
Density (g cm-3): 0.86
Flash point: 46 C (closed cup)
Explosion limits:
Autoignition temperature:
Water solubility: negligible
 Stability

Stable. Combustible. Incompatible with strong oxidizing agents. Toxicology

Harmful if inhaled or swallowed. Irritant. Typical TLV/TWA 25 ppm. Typical STEL 35 ppm.

Toxicity data
(The meaning of any abbreviations which appear in this section is given here.)
IHL-RAT LC50 24 mg/m3/4h

Risk phrases
(The meaning of any risk phrases which appear in this section is given here.)
R20 R22 R36 R37 R38. Transport information

(The meaning of any UN hazard codes which appear in this section is given here.) Personal protection

Safety glasses, good ventilation.

Safety phrases
(The meaning of any safety phrases which appear in this section is given here.)
S26 S36.

 

 



1,3,5-TRIMETHYLBENZENE ICSC: 1155
 

Date of Peer Review: March 2002  
  Mesitylene

CAS # 108-67-8 C9H12
RTECS # OX6825000 Molecular mass: 120.2
UN # 2325
 
EC # 601-025-00-5

 
TYPES OF HAZARD / EXPOSURE ACUTE HAZARDS / SYMPTOMS PREVENTION FIRST AID / FIRE FIGHTING
FIRE Flammable. NO open flames, NO sparks, and NO smoking. Alcohol-resistant foam, dry powder, carbon dioxide.
EXPLOSION Above 50°C explosive vapour/air mixtures may be formed. Above 50°C use a closed system, ventilation, and explosion-proof electrical equipment. Prevent build-up of electrostatic charges (e.g., by grounding). In case of fire: keep drums, etc., cool by spraying with water.

 
EXPOSURE   PREVENT GENERATION OF MISTS!  
Inhalation Confusion. Cough. Dizziness. Drowsiness. Headache. Sore throat. Vomiting. Ventilation, local exhaust, or breathing protection. Fresh air, rest. Refer for medical attention.
Skin Redness. Dry skin. Protective gloves. Remove contaminated clothes. Rinse skin with plenty of water or shower.
Eyes Redness. Pain. Safety spectacles. First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
Ingestion (See Inhalation). Do not eat, drink, or smoke during work. Rinse mouth. Do NOT induce vomiting. Refer for medical attention.

 
SPILLAGE DISPOSAL PACKAGING & LABELLING
Collect leaking and spilled liquid in sealable containers as far as possible. Absorb remaining liquid in sand or inert absorbent and remove to safe place. Do NOT wash away into sewer. Do NOT let this chemical enter the environment. Personal protection: filter respirator for organic gases and vapours. Marine pollutant.
EU Classification
Symbol: Xi, N
R: 10-37-51/53
S: (2-)-61
UN Classification
UN Hazard Class: 3
UN Pack Group: III
EMERGENCY RESPONSE SAFE STORAGE
Transport Emergency Card: TEC (R)-30S2325
NFPA Code: H0; F2; R0 Fireproof. Separated from strong oxidants. Well closed. Keep in a well-ventilated room.

  IPCS
International
Programme on
Chemical Safety Prepared in the context of cooperation between the International Programme on Chemical Safety and the Commission of the European Communities © IPCS, CEC 2004

SEE IMPORTANT INFORMATION ON BACK

 

1,3,5-TRIMETHYLBENZENE ICSC: 1155

 
IMPORTANT DATA
PHYSICAL STATE; APPEARANCE:
COLOURLESS LIQUID, WITH CHARACTERISTIC ODOUR.

CHEMICAL DANGERS:
The substance decomposes on burning producing toxic and irritating fumes. Reacts violently with strong oxidants causing fire and explosion hazard.

OCCUPATIONAL EXPOSURE LIMITS:
TLV: 25 ppm as TWA; (ACGIH 2004).
MAK: (all isomers) 20 ppm, 100 mg/m³; Peak limitation category: II(2); Pregnancy risk group: C; (DFG 2004). ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation.

INHALATION RISK:
A harmful contamination of the air will be reached rather slowly on evaporation of this substance at 20°C; on spraying or dispersing, however, much faster.

EFFECTS OF SHORT-TERM EXPOSURE:
The substance is irritating to the eyes, the skin and the respiratory tract. If this liquid is swallowed, aspiration into the lungs may result in chemical pneumonitis. The substance may cause effects on the central nervous system.

EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:
The liquid defats the skin. Lungs may be affected by repeated or prolonged exposure, resulting in chronic bronchitis. The substance may have effects on the central nervous system and blood. See Notes.
PHYSICAL PROPERTIES
Boiling point: 165°C
Melting point: -45°C
Relative density (water = 1): 0.86
Solubility in water: very poor
Vapour pressure, kPa at 20°C: 0.25
Relative vapour density (air = 1): 4.1 Relative density of the vapour/air-mixture at 20°C (air = 1): 1.01
Flash point: 50°C (c.c.)
Auto-ignition temperature: 550°C
Octanol/water partition coefficient as log Pow: 3.42
ENVIRONMENTAL DATA
The substance is harmful to aquatic organisms. Bioaccumulation of this chemical may occur in fish.