Not at all what I was expecting from this thread. Sorry, gunter, can't help but I'm someone can

A google search does throw up a supplier in Alaska, who might be the original manufacturer. It is worth a go at contacting them.

Gunther, For the panel to be considered as Class 0, it must be non-combustible throughout; or The aluminium surface material and substrate must be Class 1. Given the approx date for the panel as advised by you, the panel should have been tested in accordance with BS476: Part 6: 1968. Given the age of the panel, it would be prudent to consult the BRE Report “results of surface spread of flame tests on building materials 1976. Plaschem are listed at pages 114 – 115 Plaschem ltd Crystal mill Dale Street Radcliff Manchester M26 9 AF There are two entries and test reports for the Plaschem panels, each of them are class 1. 25 mm rigid urethane board faced with paper and coated with aluminium foil 0.0009 mm Warrington research centre report WRC 6434 13 mm polyurethane foam board faced acrylic coated aluminium foil Warrington research centre report WRC 9579 It would be reasonable to assume that similar products from this manufacturer were submitted to similar tests and that they would appear to meet the requirements of Class 0 based on the tests confirming Class 1. Bleve :}

As an aside we have product here on site that has been confirmed to contain asbestos in the paper/ foil coating over the foam boarding. It's an insulated roofing panel. So just tread with caution. Sorry I can't help with other product info/ fire ratings/ etc. That is not my speciality.