Classification of foam
According to the production method, this material is divided into two large classes, which have completely different characteristics. The former is manufactured at high temperatures by sintering granules. The second involves mixing granules at elevated temperatures with the further addition of a special blowing agent and removal from the extruder.
The first class is called the non-pressing , it's easy to identify by eye. The material looks like put together balls, something like a beehive. It suffices to recall foam, in which any household appliances( microwave oven, refrigerator) were supplied. The second class is called press , because the granules are connected together much more durable. It is much more difficult to break or crumble. In accordance with this, different brands are distinguished.
Foam plastic grades
Foam plastic marking of domestic manufacturers is indicated by two letters - PS.If the material is non-press, then three letters are used - PSB.Other numbers and letters can be added to them through the dash. For example, PSB-C means a self-extinguishing foam. So, let's describe the main existing brands, so you can know which polystyrene to choose.
- PSB-C-15 - has a low density and is used for insulation of those structures where special mechanical strength is not needed. This type of material is insulated with mansards, an uncracked roof, containers, wagons, fill the distance between the rafters. It is environmentally safe, not exposed to any microorganisms, has a high moisture resistance.
- PSB-C-25 - is the most popular and universal brand. It is used for warming walls, floors, building facades, loggias. It is not exposed to microorganisms, is environmentally safe, has high resistance to aging and moisture.
- PSB-C-35 - is used to a greater extent to isolate the foundation, underground communications( including parking lots).It is also used to prevent swelling of soils during the arrangement of swimming pools, sports grounds, lawns. Plus, it's an ideal material for adverse climatic conditions. It is biologically safe, has a high mechanical strength, is resistant to aging, moisture and the development of microorganisms.
- PSB-C-50 - has the highest density in comparison with all other brands. Used in those environments where mechanical strength is important. It is used in the construction of roads in wetlands, the arrangement of floors between floors. It is also well suited for floor insulation in barns, garages, industrial areas. The material is biologically safe, resistant to aging and moisture.
Types of foam
As already mentioned, this material is divided according to the mode of production. Conventionally, the following types are distinguished: polystyrene, polyurethane, polyethylene, polyvinyl chloride foams.
The first are produced by the pressed and non-pressed method, the grades are described above. The second - polyurethane( PPU), in everyday life are distributed in the form of conventional foam rubber. Still others - polyethylene( PPE), have the appearance of an elastic material, into which the goods are wrapped, so that it does not break( film with air pimples).
Fourth - polyvinylchloride( PVC), very similar in appearance to extruded polyethylene foam. Also very elastic, have the same properties. In addition, they do not have highly toxic mixtures and are recognized as self-extinguishing material.
In fact, there are more species. If you are interested in a particular material, you should know the information in the building store, where all varieties are listed in the catalogs.
