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ultra-pure
ultra-pure adj. 
/ˌʌltrəˈpjɔː/,
Brit. /ˌʌltrəˈpjʊə/
, /ˌʌltrəˈpjʊə//ˌʌltrəˈpjɔː/U.S. /ˌəltrəˈpjʊ(ə)r/
/ˌəltrəˈpjʊ(ə)r/ΚΠ
1961 New Scientist 26 Oct. 237/2 Ultra-pure or conductivity water was, until a few years ago, a substance made in small quantities by multiple distillation..mainly for use in research laboratories.
1973 Nature 13 Apr. 482/3 The preparation, handling containment and analysis of ultrapure materials.
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