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non-biodegradable
non-biodegradable adj. 
/ˌnɑnˌbaɪoʊdiˈɡreɪdəb(ə)l/
Brit. /ˌnɒnbʌɪə(ʊ)dᵻˈɡreɪdəbl/
, /ˌnɒnbʌɪə(ʊ)dᵻˈɡreɪdəbl/U.S. /ˌnɑnˌbaɪoʊdəˈɡreɪdəb(ə)l/
, /ˌnɑnˌbaɪoʊdəˈɡreɪdəb(ə)l//ˌnɑnˌbaɪoʊdiˈɡreɪdəb(ə)l/ΚΠ
1967 New Scientist 31 Aug. 440/1 Organic substances which are largely or totally nonbiodegradable are currently being used in both domestic and industrial applications.
1990 K. Vonnegut Hocus Pocus i. 15 Never mind what he did to the environment with his nonbiodegradable plastics.
1999 in D. Bolger Ladies' Night at Finbar's Hotel 243 I kind like the idea of silicone. It's non-biodegradable.
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