Classification of Chemicals Flame & Detonation Arrester Specifications PROTECTOSEAL

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1 Flame & Detonation Arrester Specifications PROTECTOSEAL The Protectoseal Company recommends that the National Electric Code (NEC) Article 500, rankings of various chemicals be used, whenever possible, to determine the suitability of a detonation arrester for use with a particular chemical. When no NEC rating of the particular chemical is available, the International Electrotechnical Commission (IEC) classification (Groups IIA, IIB and IIC) is recommended as a secondary source of information for determining the suitability of an arrester for its intended service. In general, the IEC is equivalent to the NEC ; the IEC is equivalent to the NEC ; and the IEC Group IIC includes chemicals in the NEC Groups A and B. In the event of a discrepancy between the NEC and the IEC ratings, Protectoseal recommends that the NEC groups be referenced. Explanation for Classifications of Butadiene, Proplyene Oxide and Carbon Disulphide: The NEC chemical groupings are fairly straightforward except as they relate to a few specific common chemicals (Butadiene and Proplyene Oxide). Underwriters Laboratories performed testing that led to the classification, by Group, of many of the chemicals in NEC Article 500. These test results are summarized in UL Bulletins of Research numbered 58, 58A and 58B. Excerpts from these bulletins, as they relate to the two referenced chemicals, are included. These excerpts state that the two chemicals may be considered to be a member of more than one Group. Bulletin 58 indicates that, strictly on the basis of its flame propagation characteristics, Proplyene Oxide would be classified as a material, while Butadiene would qualify as a material. In each of these cases, the chemicals were primarly listed in a higher category (Group B), because of relatively high pressure readings noted in one phase of the standard test procedure conducted by Underwriters Laboratories. These pressures were of concern when categorizing the chemicals because these NEC groupings are also used as standard indicators for the design strength requirements of electrical boxes, apparatus, etc. that must withstand the pressures generated by an ignition within the container. It should be noted that, in each of these cases, the test pressures recorded were significantly lower than those commonly encountered when testing a detonation arrester for its ability to withstand stable and overdriven detonations. On the basis of the information presented in the referenced Bulletins, and on the basis of the "double listing" available in NEC Article 500 for each of these chemicals, Protectoseal recommends that, for purposes of specifying detonation arrester, they (Butadiene and Proplyene Oxide) be treated as materials. As a point of information, the IEC ratings of each of these two chemicals is IIB, which roughly corresponds to the NEC ranking. Carbon Disulphide is specified in NEC Article 500 as representing a special hazard requiring safeguards beyond those required for any of the standard chemical groups include Group B, Hydrogen, and Group A, Acetylene. Protectoseal will not offer bids or honor orders for flame or detonation arresters for use in Carbon Disulphide service. Acetaldehyde Assume Acetic Acid Acetone 1.02mm Acetonitrile 1.50mm Acetyl Chloride Acetylacetone Acetylene Group IIC Group A Assume Group A.0.37mm Acrolein Group B Assume Group B Acrylaldehyde Acrylonitrile Assume 0.87mm Allyl Alcohol Allyl Chloride Aminoethanol Ammonia 3.17mm

2 Amphetamine Amyl Acetate 0.99mm Amyl Methyl Ketone Anilene Benzene Benzotriflouride Benzyl Chloride Bromobutane Bromoethane Butadiene Group B(C) Assume 0.79mm Butane 0.98mm Butanol 0.94mm Butyl Acetate 1.02mm Butyl Glycolate 0.88mm Butyl Mercaptan Butyl Methyl Ketone Butylamine Butylene Butraldehyde Carbon Disulphide Group IIC None No Quotation 0.34mm Carbon Monoxide Assume 0.94mm Chlorobenzene Chlorobutane Chloroethane Chloroethanol Chloroethylene Chloromethane Chloroprene Chloropropane Coal Tar Naptha Coke Oven Gas Page 2

3 Cresol Crotonaldehyde Cumene Cyclobutane Cycloheptane Cyclohexane 0.94mm Cyclohexanol Cyclohexanone 0.95mm Cyclohexene Cyclohexlamine Cyclopentane Cyclopropane Assume Cymene Decahydronaphthanlene Decane 1.02mm Di-isobutylene Di-isoprophylmine Di-n-propylamine Diacetone Alcohol Diamincethane Dibutyl Ether 0.86mm Dichlorobenzene Dichloroethane 1.80mm Dichloroethylene Dicyclopentadiene Diethyl Ether 0.87mm Diathylamine Assume Diethylaminoethanol Dimethyl Ether 0.84mm Dimethylamine Assume Dimethylaniline Page 3

4 Dioxane 0.70mm Dioxolane Dipropylether Epichlorohydrin Epoxypropane Ethane 0.91mm Ethanethiol Ethanol 0.89mm Ethanolamine Ethyl Acetate 0.99mm Ethyl Acetoacetate Ethyl Acrylate Assume 0.86mm Ethyl Benzene Ethyl Chloride Ethyl Formate Ethyl Mercaptan Assume Ethyl Methacrylate Ethyl Methyl Ether Ethyl Methyl Ketone Ethyl Morpholine Ethyl Nitrate Group IIC Ethyl Nitrite 0.96mm Ethylamine Ethylbenzene Ethylcyclobutane Ethylcyclohexane Ethylcyclopentane Ethylene 0.65mm Ethylene Dichloride Ethylene Oxide Group B Assume Group B 0.59mm Page 4 Ethylenediamine

5 Ethylenimine Formaldehyde (gas) Group B Furan Gasoline Heptane 0.91mm Heptanol 0.94mm Heptane Hexane 0.93mm Hexanol 0.94mm Hexanone Hexanes Hydroacetic Acid Hydrogen Group IIC Group B 0.29mm Hydrogen Cyanide Hydrogen Selenide Hydrogen Sulfide Isomyl Acetate Isobutyl Acrylate Isobutyraldehyde Isoprene Isopropenylbenzene Isopropyl Acetate Isopropyl Ether 0.94mm Isopropyl Glycidyl Ether Isopropyl Nitrate Isopropylamine Kerosene LPG Gas Mesityl Oxide Metaldehyde Methane 1.14mm Page 5

6 Methanol 0.92mm Methyl Acetate 0.99mm Methyl Acrylate Assume 0.85mm Methyl Ether Methyl Ethyl Ketone 0.92mm Methyl Formal Methyl Formate Methyl Isobutyl Ketone 0.98mm Methyl Isocyanate Methyl Mercaptan Methyl Methacrylate Methyl Propanol Methylacetylene Methylamine Methylcyclobutane Methylcyclohexane Methylcyclohexanol Methylcyclopentane Methylene Chloride Methylstyrene Monomethyl Hydrazine n-propyl Ether Naphtha Naptha (Petroleum) Napthalene Nitroethane Assume Nitromethane Assume Nitropropane NN-Dimethylanilene Nonane Nonanol Page 6

7 Nonene Octane 0.94mm Octanol Octene Pentane 0.93mm Pentane-2.4-Dione Pentanol 0.99mm Pentanone Pentene Petroleum Naphtha Phenol Propane 0.92mm Propane-Thiol Propanol Propene Propionaldehyde Propyl Acetate 1.04mm Propyl Ether Propyl Methyl Ketone Propyl-Mercaptan Propyl Nitrate Group B Propylamine Propylene 0.91mm Propylene Dichloride Propylene Oxide Group B(C) Assume 0.70mm Propyne Pyridine Styrene Tetrafluoroethylene Tetrahydrofuran Tetrahydrofurfuryl Alcohol Page 7

8 Tetrahydrothiophene Thiophene Toluene Toluidine Triethylamine Assume Trifluorotoluene Trimethylamine Trimethylbenzene Trioxane Turpentine UDMH Unsym. Dimethyl Hydrazine Valeraldehyde Vinyl Acetate 0.94mm Vinyl Chloride 0.99mm Vinylidene Chloride 3.91mm Xylene Page 8 PROTECTOSEAL Safety Without Compromise 225 Foster Ave., Bensenville, IL P F The Protectoseal Company CHEM CLASS

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