The present invention solves the above described problems, by providing {HEAD ~ modified polyester impregnated castings}, which are resistant to {TAIL ~ the chemical and solvent attack} of R22 and R12 
The present invention solves the above described problems , by providing { HEAD ~ modified polyester impregnated castings } , which are resistant to { TAIL ~ the chemical and solvent attack } of R22 and R12
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