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