Hello,
I need some help. I work in aquatic industry and we ship all around the world. As we handle tropical marine fish our main goal in shippment is to provide a stable temperature in the carton box. We use hot water in bags with all the fish bags, to provide a heat source. But i was thinking is there any liquid, Gel or another form that manage to provide heat for a long time ? 24-48 hours.
Sincerely
Antonio Gomes