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cuz it has a lot of air particles in between which allows the sound to travel slower.

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12y ago

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When was polyurethane foam first made?

in 1380 by Richard thinkton, England, Dublin.


Whether plastic foam which contains pockets of air would be a good conductor or a good insulator.?

Plastic foam containing pockets of air is a good insulator. The air pockets hinder the transfer of heat or electricity, making it difficult for these forms of energy to pass through the material. This makes plastic foam with air pockets an effective insulator for keeping things warm or preventing electrical conduction.


What are the properties of polyurethane?

Polyurethane is known for its durability, flexibility, and resistance to abrasion and chemicals. It is also lightweight and can be molded into a variety of shapes, making it a versatile material for a wide range of applications.


What is the representative peak heat release rate for a sofa made of polyurethane foam is approximately?

The representative peak heat release rate for a sofa made of polyurethane foam is approximately 300 to 400 kW/m². This value can vary based on factors such as the specific formulation of the foam and the presence of other materials in the sofa's construction. Polyurethane foam is known for its high flammability, which contributes to its significant heat release during combustion.


Where could one find some Polyurethane Foam Insulation?

Polyurethane foam insulation is the most popular insulation on the market today. It is easily installed, it is sprayed into the walls where it coats and hardens. All home improvement stores carry it.