Special Performance of Closed Cell Elastomeric Insulation

Special Performance of Closed Cell Elastomeric Insulation

Closed Cell Elastomeric Insulation

Closed Cell Elastomeric Insulation has many advantages compared to open Cell Insulation:

1. Lower thermal conductivity.The air flow in the closed cell structure is slower than that in the open cell structure, so the thermal convection is slower, too.

2. Better mechanical performance

3. The closed cell structure is not suitable for bacterial growth, because bacteria cannot grow in a closed environment.


Elastomeric Insulation

 

Foam Rubber

Block the Transmission of Water Vapor

Closed cell foam rubber do not support the transmission of water vapor.The smaller the heat conductivity is, the greater the resistance to water vapor is, and the better the effect of the application will be.Especially for some cold water pipes, choose a foam rubber with proper thickness is very important. A good insulation will keep the surface temperature of the pipe higher than the dew point and prevent the condensation to happen.Ambient temperatures will try to upset the balance created by the insulation.The heat conductivity of water is 0.58w/(mK), which is 16 times higher than the foam rubber insulation.Any water absorption will reduce the thermal resistance of the insulation.Once the thermal resistance is reduced, the surface temperature of the pipe will decrease.When the temperature drops below the dew point, condensation occurs.The condensation water is the main cause of corrosion and rust on the surface of the pipe.

 

Refrigeration Pipe Insulation

Environmental Protection and Application of Refrigeration Pipe Insulation

Many insulation are porous or fibrous.This kind of insulation is not suitable for cold water  applications. Because when a porous fiber meets a wet, cold surface, it will absorb water, which will produce a basic living condition for bacteria.Refrigeration Pipe foam rubber Insulation does not have this kind of problem.And foam rubber is a kind of environmental protection material,too. There is no harmful gas emissions.In the United States, FOAM RUBBER insulation is considered green by the  AQS (Air Quality Science)Laboratories.This certification means that the product can be used for children and schools without releasing any harmful gases.In Europe, there is a similar certification,too.Germany's EPA"Environmental Protection Agency" said foam rubber insulation are completely harmless to the environment and will not release any harmful gas.Therefore, the Refrigeration Pipe Insulation is regarded as an ideal material for the insulation of public facilities, such as schools, hospitals and so on.Similarly, the Foam Rubber Pipe Insulation  is also used in clean rooms.For example, the microchips production room - where no dust or pollution is allowed.

 

Pipe Insulation

Common reference coefficient of foam rubber insulation:

Thermal Insulation is the most basic reference coefficient for selecting an insulation layer

1. Temperature: the maximum and minimum temperature of the insulation that can be used maintaining normal performance.

2. Thermal conductance "C": The time rate of steady state heat flow through a unit area of a material or construction induced by a unit temperature difference between the body surfaces.C-value, hence, is the reciprocal of the R-value

3. Emissivity "E": The emissivity of a material (usually written ε or e) is the relative ability of its surface to emit energy by radiation. It is the ratio of energy radiated by a particular material to energy radiated by a black

body at the same temperature.

4. Thermal resistance "R": Resistance of a material to the flow of heat.

5. Thermal transmittance "U": The overall conductance of heat flow through an "assembly".


Foam Rubber

 

Cold Pipe Insulation                      

Mechanical and Chemical Properties of Cold Pipe Insulation:

When choosing the insulation layer, there are some other factors that need to be considered:

1. PH: PH is important if moisture is present.The insulation must not be corrosive.

2. Appearance: if code requires or used in exposed areas, it needs to be considered.

3. Water absorption: when the material must be in contact with liquid use.

4. Chemical reaction: when combustible materials are applied, the potential fire risk should be expressed.

5. Chemical resistance: when the salinity or chemical composition of the ambient air is high.

6.Coefficient of expansion and contraction: describes the expansion or contraction coefficient of a material in the case of heat absorption or loss.

7. Combustion performance: if the material is resistant to flame

8. Compressive strength: if the insulation needs to bear load, it should indicate how much weight the insulation layer can bear without shape changing.

9. Dimensional stability: describes the probability of cracks, holes or sagging in materials.

 


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