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Friday, 21 February 2014

Expanded polystyrene (EPS) for Thermal Insulation

Expanded Polystyrene (EPS) is produced from styrene monomer, derivative of ethylene and Benzene by applying polymerization process.
Expanded polystyrene foam (EPF) is a plastic material that has special properties due to its structure. Composed of individual cells of low density polystyrene, EPF is extraordinarily light and can support many times its own weight in water. Because its cells are not interconnected, heat cannot travel through EPF easily, so it is a great insulator. EPF is used in flotation devices, insulation, egg cartons, flats for meat and produce, sandwich and hamburger boxes, coffee cups, plates, peanut packaging, and picnic coolers. Although it is generally called Styrofoam, Styrofoam is a trademark of Dow Chemical Company and refers specifically to a type of hard, blue EPF used mainly in boating.
Expanded Polystyrene
 Foam Sheets,
4" x 24" x 48", qty 1
EPS's main component is styrene (C 8 H 8 ), which is derived from petroleum or natural gas. Styrene is polymerized by heat. Stopping the polymerization is difficult; however, inhibitors such as oxygen, sulfur, or quinol can be used. To form the low-density, loosely attached cells EPF is noted for, polystyrene must first be suspended in water to form droplets. A suspension agent, such as specially precipitated barium sulfate or copolymers of acrylic and methacrylic acid and their esters (organic product formed by the reaction between of an acid and an alcohol), is then added to the water. Numerous suspension agents are used commercially. All are similarly viscous and serve to hold up the droplets, preventing them from sticking together. The beads of polystyrene produced by suspension polymerization are tiny and hard. To make them expand, special blowing agents are used, including propane, pentane, methylene chloride, and the chlorofluorocarbons.
First, styrene is made by styerenemonomer. Next, the styrene is subjected to suspension polymerization and treated with a polymerization initiator, which together convert it into polystyrene. Once a polymer chain of the desired length has formed, technicians stop the reaction with terminating agents. The resulting polystyrene beads are then cleaned, and anomalous beads filtered out. To make small-cell EPF, workers then melt, add a blowing agent to, and extrude the beads. To produce smooth-skinned EPF, they pre-expand the beads, dramatically reducing their density. Next they heat and expand them before allowing them to sit for 24 hours so that they can cool and harden. The beads are then fed into a mold of the desired shape.

Expanded polystyrene blocks, boards or injection moulded products conform to BS 3837: 1977 and are available in two grades i.e. Type N & Type A. Type N is the standard while its modified version by the incorporation of flame retardant additives. -the Type A meets the additional requirement for the extent of burn when tested in accordance with BS 4735.
Characteristics of Expanded Polystyrene: High thermal insulation value. Resistance to decay, age and water. Low water vapour transmission. Rigid but extremely light in weight

APPLICATIONS

  • Expanded polystyrene as thermal insulation and impact noise insulation - is the most efficient material used in the building industry for insulating walls, floors, ceilings, roofs etc.
  • It's also used in the building as expansion joints filler, as permanent concrete filler and in sandwich panels for the pre-fabrication filed etc.
  • As ceiling tiles, besides its insulating power, expanded polystyrene have an attractive appearance.
  • It's the most widely used insulation for refrigerated rooms, freezers, trucks, piping, air ducting.
  • Expanded Polystyrene, due to its negligible weight, has great buoyancy and with its rigidity and impermeability it has become widely used in the flotation field under various forms and shapes.
  • Because of its advantageous characteristics, its nice appearance and particularly its impact absorbing properties expanded polystyrene has become the ideal packaging material.
  • Expanded Polystyrene is much used for decorative works because of its low density and easy workability it keeps suggesting new applications to those who work with it

ADVANTAGES

  • Cutting and shaping of expanded polystyrene is extremely easy. It can be cut with ordinary wood or metal saws, with a fine blade especially with hot wire which produces exceptionally smooth cut surfaces.
  • Expanded Polystyrene will adhere to itself or to a wide variety of materials through the use of adhesives containing other than petroleum-derived solvents.
  • Expanded Polystyrene can easily be painted but only with latex, water of epoxy paints

Benefits

Insulate & Weatherize:
For Energy Efficiency at Home

  • Good energy saver.
  • Save money up to 40%
  • Hygienic, free from fungus and germs etc.
  • Create comfortable living and working environment.
  • One time investment and life long benefit.
  • Protects household from heat and cold

Features

  • Excellent thermal insulation.
  • High resistance to water absorption.
  • Good resistance to moisture.
  • High compressive strength and flexural strength.
  • Resistance to all climates.
  • Very strong, easy to cut and handle.
  • Protect heat, cold and resistant to most of the chemicals.
  • Good water proofing membranes.
  • No harm to human body, animals and plants.
  • Economic compared with other insulation materials.
  • Environment friendly.

Environment impact factor ODP, CFC & GWP

The Visual Handbook
of Energy Conservation:
A Comprehensive Guide 

to Reducing Energy Use at Home
Ozone Depletion Potential (ODP) is the potential of any gas to deplete the ozone layer. Expandable Polystyrene (EPS) uses Pentane as its blowing agent. Pentane has an ODPof ZERO. Therefore the ODP value of EPS is ZERO.
Expanded Polystyrene is HFC, CFC, and HCFC, free since it has no chlorine content.
Global Warming Potential (GWP) is a method of measuring the strength of different 'greenhouse' gases in the atmosphere and used to define the impact on global warming over different periods of time. C02 has a GWP of J over 100 years. HFC, CFC, HCFC and methane arc measured relative to C02, their relative global warming effect after 100 years relative to the simultaneous emission of the same mass of C02. EPS has a GWP<5 when measured relative to CO2 over 100 years.

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