styrene heavier than air

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September 21, 2016

styrene heavier than air

STYRENE 1. Flammable concentrations of vapor can accumulate at temperatures above flash point; see Section 9. • Vapors may form explosive mixtures with air. Vapors from styrene may cause flash fire. If the polymerization takes place inside a closed container, the container may rupture violently. If it contacts an ignition source, it will ignite (flash back). 5.3 Advice for fire -fighters A self contained brea thing apparatus and suitable protective clothing should be worn in fire conditions. Ignition and/or flash back may occur. Benzene evaporates into the air very quickly. In the event of a spill, styrene forms a slick that spreads on the water surface and evaporates . Control Valves - Control Valve terminology, bodies, trim, flow characteristics, Cv and Kv sizing, noise, actuators and positioners; Gases and Compressed Air - Air, LNG, LPG and other common gas properties, pipeline capacities, sizing of relief valves; Material Properties - Material properties for gases, fluids and solids - densities, specific heats, viscosities and more POTENTIAL HEALTH EFFECTS EYES: Contact may … Monitor area with combustible gas indicator. Where benzene is found and how it is used . Initial Boiling Point For Styrene 293.40 Deg F (145.22 Deg C) @ 760.00 mm Hg Vapor Pressure For Styrene 4.3 mm Hg 68 Deg F (20.00 Deg C) Vapor Density Air = 1 3.6 Specific Gravity 1.110 - 1.130 @ 77.00 Deg F (25.00 Deg C) Percent Non-volatiles 55.0% Evaporation Rate Slower than Ether Prevent the spilled product coming into contact with sources of flame. Avoid all sources of ignition: heat, sparks, open flame. Because styrene is heavier than air it will pool at the bottom of a mold cavity and slow down the cure of the gelcoat located in the bottom or lower parts of a mold. Using fans to circulate air will help clear low-lying areas of really intense concentrations. Most vapors are heavier than air. Less dense than water and insoluble in water. More than 85% of styrene is sorbed in 78 hrs on samples from a sandy aquifer(3). The main problem in distillation is the very high energy consumption, because TBC is heavier than styrene so a large amount of the monomer purified must be evaporated and then condensed. Styrene will polymerise readily at elevated temperatures and containers may explode if heated. For more than 70 years, styrene has been used as a chemical building block to make the materials used in a wide variety of finished consumer products, such as food containers, rubber tires, building insulation, carpet backing and boat hulls, surfboards, residential kitchen countertops, bathtubs and shower enclosures. Extinguish naked flames. Related Topics . 3. Vapour is heavier than air and may travel along the ground; distant ignition is possible. Closed containers may rupture violently when heated. STYRENE MONOMER, STABILISED Unsuitable extinguishing media Do not use water jet as an extinguisher, as this will spread the fire. as it spreads. Vapours are heavy and collect in low areas. Styrene, also known as Ethenylbenzene, Phenylethylene, Vinylbenzene, Cinnamene, etc, has a Molecular Weight of 104.15 g/mol and is insoluble in water while also being less dense than water.It is highly soluble in organic solvents such as Acetone, CCl4, Benzene, Ether, n-Heptane, and Ethanol. As styrene thermal polymerization rate becomes important at temperatures higher than 50 °C , , the distillation process must be carried out at reduced pressure . The vapour is heavier than air, spreads along the ground and distant ignition is possible. Benzene is formed from both natural processes and human activities. Styrene Monomer may accumulate static electricity. The reaction to styrene-epoxide was stronger than that obtained by patch testing with an equimolar concentration of styrene, 0.1 percent weight per volume in ethanol. Behaviour in the environment . It is insoluble in water and is lighter than water in liquid form. The styrene gives out irritating or toxic fumes (or gases) in a fire only. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Styrene is 3.6 times heavier than air and rapidly settle down, not spread at height more than 3 ft, but in nearby village and area, people fell which walking, animals died when standing. Use antistatic tools. Vapours are heavier than air and may travel considerable distances to a source of ignition and flashback. Take precautionary measures against static discharge. A clear colorless to dark liquid with an aromatic odor. Identification of the substance Styrene Monomer CAS number 100-42-5 1.2 Relevant identified uses of the substance or mixture and uses advised against ... Vapors are heavier than air, spread along floors and form ex-plosive mixtures with air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). By mass, dry air contains 75.52% nitrogen, 23.15% oxygen, 1.28% argon and o.oo35% carbon dioxide as the major components. Related Topics . PRODUCT AND COMPANY IDENTIFICATION MANUFACTURER DUDICK, INC. 1818 MILLER PARKWAY STREETSBORO, OH, 44241 330-562-1970 24 HR. Styrene's low flash point and lower explosive limit render it a serious fire and explosion hazard. Avoid Sparks. General clean air dilution or local exhaust ventilation should be provided in volume and pattern to keep vapors well below the lower explosion limit and all The choice of instrument settings for the process measurements was informed by the molecular weight of styrene at 104.15 g/mol which is higher than the averaged equivalent for air at 28.97 g/mol (Engineering Toolbox, 2013).To represent the worst-case scenario, the PID instrument was located on the centreline between the mould tool and the extraction system (Supplementary Fig. Styrene Monomer can POLYMERIZE resulting in uncontrolled reactions. Styrene vapors are heavier than air and may concentrate in the lower levels of molds and the work area. At elevated temperature such as in fire condition, polymerisation may take place, which may lead to container explosion. Flammable mixtures may exist within the vapor space of containers at room temperature. … Vapours are heavier than air … May give off toxic fumes in a fire. Benzene dissolves only slightly in water and will float on top of water. heavier than air and may travel a long distance and accumulate in low lying areas. Styrene vapors will inhibit and slow the cure of gelcoat. If tank, rail car or tank truck is involved in fire, ISOLATE for 800 meters (1/2 mile) in all directions; also, consider initial evacuation for 800 Vapour is heavier than air and may travel considerable distance to a source of ignition and flash back. In the atmosphere, styrene, being heavier than air settles down soon, is rapidly dispersed, especially in the presence of sunlight. Handle and open container with care in well-ventilated area. 4.5 Corrosion Properties. Run-off may cause a fire or explosion hazard. Vapors are heavier than air and may travel to a source of ignition and flash back. 5.2. Vapours are heavier than air and will spread at floor level. • Runoff to sewer may create fire or explosion hazard. : Special hazards arising from the substance or mixture / Conditions of flammability Flammability classification (OSHA 29 CFR 1910.106) ... a-Methyl styrene 10 ppm N/Av 100ppm (Ceiling) N/Av Exposure controls 7. However, after prolonged exposure to the chemical, the ability to • Many liquids are lighter than water. In addition, styrene monomer is highly reactive, and will polymerize unless inhibited. Styrene vapors are heavier than air and may concentrate in the lower levels of molds and the work area. Ensure electrical continuity by bonding and grounding (earthing) all equipment. heavier than air; beware of pits and confined spaces. • Most vapors are heavier than air. Heat development leads to selfignition. Do not empty into drains. An extraction system should also have been in place to remove the heavier than air vapours and RPE provided with the correct filters (FFP3) to protect operators. Results of PBT and vPvB assessment: This substance does not meet the PBT/vPvB criteria of REACH, Annex XIII. Environmental precautions Do not allow to enter drains or waterways. Styrene is retained by particulates particularly in organic matter-rich soils(3). Material will float and can be re-ignited on surface of water. Carbon monoxide, Carbon dioxide. EMERGENCY TELEPHONE NUMBER ... vapors may be heavier than air and travel long distances along the ground before igniting and flashing back to vapor source. ), auto-ignition temperature: 490°C, vapours heavier than air with an odour threshold of 0.1 ppm. In the event of a fire, sty-rene burns and produces toxic and acrid smoke. Styrene is heavier than air, so if you are working down in a mold, the concentration of styrene will be very high because it doesn’t want to float up and out. vapours are flammable, heavier than air, can cause explosions when in contact with sparks. Acetone - Thermophysical Properties - Chemical, physical and thermal properties of acetone, also called 2-propanone, dimethyl ketone and pyroacetic acid. - in water: insoluble but can polymerise when exposed to sunlight. Non-corrosive to most metals except copper and copper -containing alloys. Vapors may form explosive mixtures with air. What are styrene uses? IMMEDIATE CONCERNS: Styrene and vinyl toluene vapors are heavier than air and may travel along ground or may be moved by ventilation and ignited by sources at locations distant from material handling point. explosion. Vapours are heavier than air and collect in confined and low-lying areas. Styrene vapors are heavier than air, and when ignited will flash back to the source, which may explode with enormous force. These reactions may be explosive. more quickly. Material Properties - Material properties for gases, fluids and solids - densities, specific heats, viscosities and more ; Related Documents . Ensure adequate ventilation. One can smell styrene at very low concentrations (0.02 to 1.9 parts per million). Special hazards arising from the substance or mixture Specific hazards Flammable liquid and vapour. Subject to polymerization. However, the company did not take action to comply with the Notice until they moved premises in March 2015 failing to adequately control exposure of their employees to styrene. Its vapor is heavier than air and may sink into low-lying areas. Even when inhibitor is Of styrene that had been allowed to sorb for 3 days, 61.0 and 66.7% was desorbed in 16 days from soil and aquifer soils, respectively(4). Polymerisation in the presence of acids. It is heavier than air, so the vapour tends to stay close to the ground and can travel some distance before dispersing. 4. This can be quite easily done by comparing the molar mass of the given gas with that of dry air. Dense smoke is produced when product burns. Flammable. As a general rule, styrene is heavier than air and can spread along the ground in the direction of the wind. The vapour is heavier than air spreads along the ground and distant ignition is possible. Do not use compressed air for filling, discharging, or handling operations. with air. It is reported as a gas leak, not fire blast, that means it was not the cause. Phase diagram included. Vapor is heavier than air and may travel a distance to cause a fire or explosion far from the source and flash back. Beware of pits and confined spaces. not smoke. - In air: highly volatile, explosive mixture in air (LEL: 1.1% - UEL: 6.1% vol. Danger of polymerisation above 50 °C. Vapors heavier than air and irritating to the eyes and mucous membranes. HANDLING AND STORAGE General Precautions : Contaminated leather articles including shoes cannot be decontaminated and should be destroyed to prevent reuse. Keep fire exposed containers cool by spraying with water. Solvent vapours can form explosive mixtures with air in poorly ventilated conditions. Can polymerise when exposed to sunlight readily at elevated temperature such as in fire conditions 78 hrs on samples a! - densities, Specific heats, viscosities and more ; Related Documents the source, which lead!, not fire blast, that means it was not the cause explode if heated Thermophysical -! Slow the cure of gelcoat leather articles including shoes can not be decontaminated and be... Reported as a general rule, styrene forms a slick that spreads the. And may travel considerable distances to a source of ignition: heat, sparks, open flame temperatures containers! 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