Some people are known to have allergic reactions when they come in contact with spray polyurethane foam insulation. Most allergic reactions come about when the individual comes in direct physical contact with this type of insulation.
The fumes given off by most types of spray insulation can be toxic if inhaled; overexposure can lead to a loss in consciousness. It is recommended that a respirator be worn at all times while handling this type of insulation.
Harmful greenhouse gases are given off by the blowing agents that are used to expel spray foam insulation from canisters, according to ThomasNet.com.
The smoke released from certain spray-type insulations that are not fireproof is very harmful if it is inhaled. Burning spray-type insulation is also not good for the environment.
Temporary blindness may be experienced if this type of insulation comes into contact with the eyes. Irritation may be felt upon coming into physical contact with spray insulations.