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Poly Molding has been the leading innovator in the construction industry for well over 50 years serving the Tri-state and surrounding areas. Located in Northern New Jersey, Poly Molding is only 30 minutes from New York City and Long Island. With a large line of insulation products, Poly Molding’s vast inventory of fully insulated Expanded Polystyrene (EPS) products that fulfills the needs for the commercial market as well as residential homes.
Our timely service and excellent customer relations is the reason we supply all the major distributors and has made us a long-time leader in the Expanded Polystyrene (EPS) insulation industry.
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Expanded polystyrene (EPS) is a rigid and tough, closed-cell foam. It is usually white and made of pre-expanded polystyrene beads. EPS is used for disposable trays, plates, bowls and cups; and for carry-out food packaging (including the hinged lid containers popularly know as “clam shells”). Other uses include molded sheets for building insulation and packing material for cushioning fragile items inside boxes. Sheets are commonly packaged as rigid panels (size 4 by 8 or 2 by 8 feet in the United States), which are also known as “bead-board”.
Thermal conductivity is measured according to EN 12667. Typical values range from 0.032 to 0.038 W/(m·K) depending on the density of the EPS board. The value of 0.038 W/(m·K) was obtained at 15 kg/m3 while the value of 0.032 W/(m·K) was obtained at 40 kg/m3 according to the data sheet of K-710 from StyroChem Finland. Adding fillers (graphites, aluminium, or carbons) has recently allowed the thermal conductivity of EPS to reach around 0.030–0.034 (as low as 0.029) and as such has a grey/black color which distinguishes it from standard EPS. Several EPS producers have produced a variety of these increased thermal resistance EPS usage for this product in the UK & EU.
Water vapor diffusion resistance (μ) of EPS is around 30–70.
ICC-ES (International Code Council Evaluation Service) requires EPS boards used in building construction meet ASTM C578 requirements. One of these requirements is that the oxygen index of EPS as measured by ASTM D2863 be greater than 24 volume %. Typical EPS has an oxygen index of around 18 volume %; thus, a flame retardant such as HBCD (hexabromocyclododecane), is added to styrene or polystyrene during the formation of EPS.
The boards containing HBCD when tested in a tunnel using test method UL 723 or ASTM E84 will have a flame spread index of less than 25 and a smoke-developed index of less than 450. ICC-ES requires the use of a 15-minute thermal barrier when EPS boards are used inside of a building.
According to EPS-IA ICF organization, the typical density of EPS used for insulated concrete forms is 1.35 to 1.80 pcf. This is either Type II or Type IX EPS according to ASTM C578. EPS blocks or boards used in building construction are commonly cut using hot wires.