Geotechnical article, and process for making it, the article havingcoefficient of thermal expansion less than about 150 ppm/~C at ambient;resistance to acidic media greater than polyamide 6 resin and/or resistance tobasic media greater than PET resin; resistance to hydrocarbons greater thanthat of HDPE; creep modulus of at least 400 MPa at 25~C, at 20% of yieldstress load for 60 minutes (ISO 899-1); and 1 percent secant flexural modulusat least 700 MPa at 25~C (ASTM D790); the article including a compositionincluding (a) from about 1 to about 95% by weight of the composition of atleast one functional group containing polymer or oligomer; and (b) from about5 to about 99% by weight of the composition of at least one engineeringthermoplastic, and optionally containing a filler and optionally containing anunmodified polyolefin, ethylene copolymer or ethylene terpolymer.
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