**1. The problem statement, all variables and given/known data**

A new type of insulating board has been developed by that esteemed construction company Kaput Ltd. They warn that at extremely high heat fluxes it could be ignited, but they don’t think it’s very likely and it would take hours, so there’s no real risk!

As an expert on the ignitability of materials you are asked to perform a thick/thin calculation given the following data on the material:

It is considered that if 20 kW m-2 would be enough to ignite most materials (i.e. indicative of flashover fires). Perhaps Something easy to ignite would only require 10 kW m-2. Would this material ignite within ten minutes if exposed to 10 kW m-2?Density 2400 kg m-3

Thermal conductivity 0.85 W m-1 K-1

Specific heat capacity 827 J kg-1 K-1

Thickness of board 7mm

Initial/ambient laboratory temperature 18°C

Ignition temperature 410°C

**2. Relevant equations**

**3. The attempt at a solution**

Don't know how to start this.