I used a soft silicone hose to carry ammonia at ~70 °C. I was surprised to later find the hose had hardened.
A quick materials compatibility search for silicone had given me a lot of info but an "I" (standing for "Insufficient Information") for ammonia. I wrongly assumed it would be OK.
What happened? What was produced? Can ammonia also react with or leach out elements from glassware? Should I throw the hose away? Will it become brittle?