Flammability of plasterboard

[Guest JennieHar]

I would like some advice on insulated plasterboards which I have fitted in my home and I am concerned about how flammable they may be. The product information says they have a rating of Class B-sl do but what does this mean please? How flammable are they (e.g. relative to wood?) thank you very much for any information you can provide.

Thanks, Jennie

[AnthonyB]

The system is described here - as you see it's less combustible than wood:

https://www.paroc.co.uk/knowhow/fire/fire-classification