Construction insulation properties and application of cross-linked polyethylene foam materials
What is thermal insulation?
Thermal insulation is the reduction of heat transfer (i.e., the transfer of thermal energy between objects of differing temperature) between objects in thermal contact or in a range of radiative influence. Thermal insulation can be achieved with specially engineered methods or processes, as well as with suitable object shapes and materials. (Souce from Wikipedia).
And the term of thermal insulaiton can refer to materials used to reduce the rate of heat transfer, or the methods and process used to reduce heat transfer. Heat transfer is the passage of thermal energy from a colder body.
Heat energy can be transferred by conduction, convention, irradiation or when undergoing a phase change.
The flow of the heat can be delayed by addressing one or more of these mechanisms and is dependent on the physical properties of the material employed to do this.
Other" Insulation" provided by CYG crosslinked polyethylene foam products are anti-vibration insulation or damping.
1. Attic-hot climates
On a sunny summer day, solar energy is absorbed by a roof, heating the roof sheathing and causing the underside of the sheathing and the roof framing to radiate heat downward toward the attic floor. when a radian barrier is placed directly underneath the roofing material incorporating an air gap, much of the heat radiated from the hot roof is reflected back toward the roof and the low emissivity of the underside of the radiant barrier means very little radiant heat is emitted downwards. This makes the top surface of the insulation cooler than it would have been without a radiant barrier and thus reduces the amount of heat that moves through the insulation into the rooms below the ceiling.
2. Thermal conduction and conductive barriers
Conduction occurs when heat travels through a medium, the rate at which this occurs is proportional to the thickness of the material, the cross-sectional area over which it travels the temperature gradients between its surfaces and its thermal conductivity.
Most gases including air are poor conductors and good insulators.
Conductive barriers often incorporate a layer or pockets of air to reduce heat transfer. Examples include XLPE foam and double glazed windows. Conductive heat transfer is largely reduced by the presence of the air-filled spaces (which has low thermal conductivity) rather than by the material itself. Metals exhibit high thermal conductivity and allow heat conduction to occur readily.
The effectiveness of a radiant barrier is negated if it about any material with high thermal conductivity. For instance, reflective foil needs to be provided with an adequate air gap to function enough.
3. Ceilings-Thermal and acoustic insulation
CYG acoustical products offer both a thermal and acoustic insulation solution for floors. The use of both concrete and sand with XLPE foam in between improves the reduction of the heat transfer between floors as well as the impact nouse transferred to the low floor stemming from movement on the upper floor. 5-10 mm of material can dramatically lessen the mass of the concrete and the sand used.
4. Air condition insulation
Cross-linked polyethylene foam material as produced by CYG are regularly used by industry leaders for air-conditioning applications, including:
1) air duct insulation
2) compressor and electronic area insulation
3) parts, seals and gaskets
Fire retardant grades (ASTM E84 Class A, etc.）with added adhesive and release tapes allow the attaching of the XLPE foams to A/C ducting and within the wall units.
Other uses of XLPE foam in pipe applications:
1) heat insulation of pipework in heating systems and plumbing installations.
2)Acoustic insulation of sewage and drainage pipes
3) Anti-vibration insulation when there is a pulsed flow through the piping.
This pipe is produced by heat welding XLPE foam sheet, has a variety of uses.
5) Garage door/ Metal building-Thermal insulaiton
XLPE foam adhesive to a metal garage door on the inside will give above average sound and thermal insulation.
Huzhou CYG Tefa
No.1068, Tianxing Road, Wuxing Dist., Huzhou, Zhejiang, China.