| 摘要 |
The present invention relates to heat-transfer concentrates for solar installations, containing a) from 92 to 99% by weight of at least one polyglycol of the formula R-O-(CH<SUB>2</SUB>-CH<SUB>2</SUB>-O)<SUB>n</SUB>-H, in which n is an integer of from 3 to 500 and R is H, a C<SUB>1</SUB>- to C<SUB>4</SUB>-alkyl group or an aromatic radical having 6 to 12 carbon atoms, b) from 1 to 8% by weight of at least one corrosion inhibitor, with the proviso that its content of ethylene glycol and 1,2-propylene glycol is less than 0.2% by weight.
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