We make KOFAL plasic Freezer Pans for black freezing
of seafood. There are various sizes, hearing, salmon to name two. The Kofal
plasic was developed in 1981 and is designed to go to -100f without cracking
or chipping. This KOFAL will not stick to fish like metal or aluminum.
Freezer pans nest inside each other to store after washing. My toll free
line is 888 762 7735, good in Canada and US. Outside North America 206 780
3880,
  we are in the pacific time zone, near Seattle.