question: Hvilken slags urinstof anvendes i def?
context: Diesel exhaust fluid
  Dieseludstødningsvæske (DEF) er en vandig urinstofopløsning fremstillet af 32,5 % urinstof og 67,5 % afioniseret vand. Den er standardiseret som AUS 32 (aqueous urea solution) i ISO 22241. DEF anvendes som et forbrugsstof i selektiv katalytisk reduktion (SCR) for at sænke NOx-koncentrationen i dieseludstødningsemissionerne fra dieselmotorer.
context_en: Diesel exhaust fluid (DEF) is an aqueous urea solution made with 32.5% urea and 67.5% deionized water. It is standardised as AUS 32 (aqueous urea solution) in ISO 22241. DEF is used as a consumable in selective catalytic reduction (SCR) in order to lower NOx concentration in the diesel exhaust emissions from diesel engines.
title_en: Diesel exhaust fluid