crystal material with 75 90 by weight of a four component liquid crystal composition of cyclohexanes application_number US 1577179 A description liquid crystal compositions having broad nematic temperature ranges wherein the compositions are in the liquid crystal phase over the temperature range from about 0 u00b0 c to at least 85 u00b0 c are formulated by combining between 10 and 25 by weight of the terphenyl liquid crystal additive 4 n pentyl 4 34 cyano p terphenyl available as t 15 from e merck co having the chemical formula str1 with about 75 90 by weight of a 4 part cyclohexane liquid crystal mixture the cyclohexane mixture commercially available as merck 1132 from e merck darmstadt west germany is a mixture of about 24 by weight of trans 4 n propyl 4 cyanophenyl cyclohexane having the chemical formula str2 which constituent is available from e merck as licristal u00ae s1103 about 36 by weight of trans 4 n pentyl 4 cyanophenyl cyclohexane having the chemical formula str3 available as licristal u00ae s1114 about 25 by weight of trans 4 n heptyl 4 cyanophenyl cyclohexane having a chemical formula str4 available as licristal u00ae s1115 and about 15 by weight of trans 4 n pentyl 4 39 cyanobiphenyl 4 cyclohexane having a chemical formula.