The first foam sample, a ceramic based acoustical material, does not burn. It is a Class A material. The second sample, a polyurethane acoustical foam, will burn but eventually extinguish. It is a Class C material. The third foam, which is for use as bedding - not as an acoustical product, ignites immediately and flames continue to spread even after the fire source is removed. Bedding or packing foam is not intended for use on vertical surfaces such as walls, or on ceilings.

Only Class A or Class 1 materials are approved to be used in public spaces as finishes for walls. Class B or C materials may be used in the homes or some areas with low occupancy, subject to local building regulations. 

If ever in doubt about the material you are using, consult your local Fire Marshall.

Here are the flammability ratings according to NFPA using ASTM E 84 - A test method for determining the surface burning characteristics of building materials, sometimes referred to as the “Steiner tunnel test”. This test method is for single products and evaluates both flame spread and smoke development, assigning different classes based upon test results: