I’ve been using the blue xps foam made by dow chemicals and it usually ranged from 28 to 32 kg per cubic metre.
I know on the forums here a lot of people don’t like it but with a 2mm layer of divinycell vacuum baged on I’ve had great success with this stuff, anyway
I recently bought a block and when I got it home it looked denser and felt a lot heavier So I measured and weighed the block did some calculations and worked out it was a lot heavier than 28kg as stated by the Australian importers web page. This foam worked out at 38kg which adds a lot of weight to the boards. I contacted the importer who said
They are now made using a new environmentally friendly blowing agent which causes the foam to be heavier and he was very sorry for any inconvenience.
Doesn’t help me much. I know other companies make xps foam a yellow one would anyone know who else makes xps or another supplier in Australia???