Chemical compatibility data

Table IS, Fire/Explosion and Chemical Compatibility Data...

Chemical incompatibility charts can help in organizing available data on the incompatibilities existing between expected mixtures. Frurip (Frurip et ah, 1997) gives one procedure for developing a chemical compatibility chart while describing some of the tools available. CCPS G-13 also provides a table of known incompatibility hazards. 

Where the instructions for use of the product involve admixture or dilution with drinks or other materials, appropriate compatibility data will be required. Factors to consider include ease and rate of dissolution, homogeneity, chemical and physical stability over the period of use, particle size, etc. 

A designer should consult with experts to interpret data from chemical compatibility tests. To meet this need, U.S. EPA developed a software system called Flexible Membrane Liner Advisory Expert System (FLEX) to assist in evaluating test data. FLEX is an expert system that is based on data from many chemical compatibility tests and contains interpretations from experts in the field. 

Describe in the first column of the table what specific materials and quantities could be combined, how they could be combined, and for how long. Use the second column to indicate whether or not ambient, unconfined conditions apply (ambient temperature, atmospheric pressure, noninerted and nonenriched atmosphere with 21% oxygen, and no enclosure or confinement). Assume published compatibility data will be valid only if ambient, unconfined conditions apply, unless the data indicate otherwise. Use the third column to indicate that, for this scenario under these conditions, a chemical reaction will occur that has the potential for any of your predetermined undesired consequences. Document any comments and the source of your information in the last column. 

PDLCOM William Andrew, Inc., Plastics Design Library test data on the chemical compatibility and the environmental stress crack resistance of plastics... 

The resonances in the butyl ether region occur in three distinct bands. Chemical shift data for the a carbon atom resonances in about 20 ethers indicate that the resonances centered about 872.9 may result from hindered aryl ethers, for example, butyl 2,6-dimethylphenyl ether, butyl benzyl ethers, or butyl n-alkyl ethers, for example, dibutyl ether. The resonances in this region could arise from tetrahydrofuran residues in the coal product. However, the results obtained in this laboratory and in Larsen s laboratory are much more compatible with interpretations that exclude the involvement of tetrahydrofuran and focus on the reactions of the labeled butylation reagent with 2,6-disubstituted phenoxides, benzylic oxides, and primary alkoxides liberated in the formation of the coal polyanion. The most intense resonance centered at... 

All data are recorded onto standard computer entry forms, checked for accuracy, and input to the Macintosh compatible data analysis system (SAMS) developed by the University of Washington under contract with the Chemical Research, Development, and Engineering Center. Parameters calculated... 

The end user combines the chemical compatibility information and the ASTM F586 or ROTT data to design ajoint. Table 4.19 shows the ROTT data of fluoropolymer gaskets currently used in the industry. For a more complete understanding of ROTT and gaskets in general, see Refs. 12 and 13. 

An interaction matrix indicates whether the combination of two or more materials yields an undesired consequence (see ASTM E2012-99, Standard Guide for Preparation of Binary Chemical Compatibility Chart). Section 6.1.1 lists data sources for developing an interaction matrix. 

Because other sections of this Handbook deal more specifically with cleanup methods, policies, and detailed spill procedures, this section only emphasizes some key points related to adsorption cleanup. The safety, health, and environment department must prepare formal written procedures for all types of chemical spillage. The specification of sorbent type must be based on an expert analysis of the MSDS (material safety data sheet) for every chemical onsite. The manufacturers technical data or MSD sheets provide information for the site-specific safety plan, such as flash point, ignition temperature, solubility, toxicology, density, reactivity, and chemical compatibility. The written procedures must cover all chemicals on site and all possible spill scenarios, particularly What is the worst incident that could happen Prevention techniques must obviously be in place and emergency plan procedures carefully prepared and practiced. 

Modified PPE resins will soften or dissolve in many halogenated and aromatic hydrocarbons. Laboratory data are available on the chemical resistance of plastics. However, such data should only be used as a screening tool. If a material is found to be incompatible in a short-term test, it wiU usually be found to be incompatible in a similar end-use environment. The converse, however, is not always true. Favorable results in a short-term test are no guarantee of actual performance in long-term, end-use conditions. The amount of molded-in stress found in any particular part wiU have a pronounced effect upon the relative chemical compatibility of a polymer. The acceptable chemical compatibility of a polymer in an application can be determined only by exposure or immersion of prototypes and suitably stressed samples in this type of environment under actual operating conditions [21]. 

The answers will narrow the selection to those lining materials that are compatible. Screening of the candidates can be accomplished by reviewing industry publications, manufacturers data sheets, and publications listing chemical resistance data, e.g.. Ref. 1. Table 1.6 will serve as a general quide for liner selection. 

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