More playing. This time with insulation under the heatbed.
Tried cork. It worked, but let through a lot of heat(acrylic framed printer) and was heavy.
This seems to be about ideal. Top layer is some kind of aluminium coated kevlar/fiberglass fabric… stuff… Mostly there to act as an electrical insulator. Main layer is… I also don’t know! Closed cell adhesive backed, foil covered building insulation. But it can handle the heat and most importantly, is fire retardant. I’ll take photos of the packet next time I’m at the hardware store(Got these scraps from a recycler) if there’s interest.
I’m not worried about ‘steady-state’ heat, I’m worried about damage to the bed/burning out a track causing an arc/hotspot and that starting the fire. 25 to 100c in 8mins. My previous record was about 12mins. And uninsulated is over 15mins. 12v bed. And holds at about 50% duty cycle.
That seems to be a good idea. I may want to test that out for myself as well.
Make it easy with Basotect®: http://www.plasticsportal.net/wa/plasticsEU~EN_GB/portal/show/content/products/foams/basotect