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BEWI NF-314p

Bewi NF-314P is a flame retardant (FR) expandable polystyrene grade containing pentane as a blowing agent and a brominated polymeric flame retardant as an FR additive. The product is delivered in the form of spherical beads with a bulk density of about 0.6 g/cm3 and is available in 1100 kg octabins.

Polymer Name: Expanded Polystyrene (EPS)

Processing Methods: Injection Molding

Additives Included: Blowing Agent, Flame Retardant

Technical Data Sheet
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Identification & Functionality

Chemical Family
Plastics & Elastomers Functions
Technologies

Features & Benefits

Materials Features

Applications & Uses

Plastics & Elastomers End Uses
Plastics & Elastomers Processing Methods
Applications & Uses

Application:

 The properties of NF-314p make it suitable for the production of flame retardant light insulation board by block or shape molding in accordance with ISO EN 11925-2 class E.

Processing: The processing conditions of NF-314p depend on the combination of the product and processing equipment used. Optimal settings have to be adjusted for each combination.

Some general processing conditions are given below:

  • Prefoaming: The steam has to be saturated at a temperature of 100–110 °C. To reach densities below 15 kg/m3 , batch prefoaming is recommended and with a continuous prefoamer to prefoam twice and to reach higher densities (>25 kg/m3 ) to mix the steam with air.
  • Conditioning: Depends on the density. The higher the density the longer the conditioning time. Generally 12–24 hours is recommended. When prefoaming in two steps, a conditioning time of 4–6 hours between the first and the second step is optimal but can be a bit longer.
  • Molding: The machine should be fed with saturated steam with a max pressure of about 2 bar. The steaming time depends on the equipment used as well as the size and required strength of the final product. Therefore, all machines have to be adjusted individually. Equipment using vacuum is recommended to reduce cycle times and to increase product strength.
  • Cutting: Hot wire cutting (oscillating or stationary wires) is recommended. Temperature of the wires should be about 200–300 °C.

Properties

Physical Form
Typical Properties
ValueUnitsTest Method / Conditions
Pentane Content5.5 - 6.5%Gas chromatography
Monomer Levelmax. 0.1%Gas chromatography
Main Bead Size Distribution1.2 - 2.5mmImage analyser
Compressive Stress at 10% (10 kg/m3)40kPa
Bending Strength (10 kg/m3)100
Heat Conductivity (λ10) (10 kg/m3)0.042W/mK
Compressive Stress at 10% (15 kg/m3)80kPa
Bending Strength (15 kg/m3)170
Heat Conductivity (λ10) (15 kg/m3)0.038W/mK
Compressive Stress at 10% (20 kg/m3)120kPa
Bending Strength (20 kg/m3)240
Heat Conductivity (λ10) (20 kg/m3)0.035W/mK
Compressive Stress at 10% (30 kg/m3)200kPa
Bending Strength (30 kg/m3)380
Heat Conductivity (λ10) (30 kg/m3)0.033W/mK

Safety & Health

Safety

In transport NF-314p is classified according to European regulations for product transport: Substance number UN2211, Class 9.

In processing avoid generating dust. All equipment should be properly earthen. Releases pentane during processing which might form a flammable/explosive vapor-air mixture. Use proper ventilation and keep away from any source of ignition.

Packaging & Availability

Packaging Type

Storage & Handling

Storage & Handling

NF-414e should be stored at below 20 °C. Protect from direct sunlight and other weather conditions (rain, wind, frost etc.). Keep away from any source of ignition. The storage time should not exceed three months. After opening of the packaging, it should be used as soon as possible.