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Expandable polystyrene beads

  • Kenya Kenya  
  • Quantity Required: 50 Tonne
  • Last Updated:
    Posted on: 12 Apr 2024

  • Buying Frequency: Quarterly
  • Payment Terms: L/C
  • Shipping Terms: CFR
  • Destination Port: Mombasa

RFQ Details

Polystyrene with below characteristic,

(for the manufacture of blocks for single panels)
Product description
Flame retardant expandable polystyrene in the form of spherical beads of medium-large particle size, containing pentane as blowing agent. No CFC or HCFC. Suitable for production of low-medium density blocks for the thermal insulation sector.
Technical data
Bulk density kg/m³ 590 - 630
Particle size mm 0.9 - 1.6
Minimum apparent density
• on a continuous pre-expander after one expansion kg/m³ 15
• on a continuous pre-expander after two expansions kg/m³ 10
• on a discontinuous pre-expander kg/m³ 16
Density range normally used kg/m³ 11 - 20
General information
It can be easily pre-expanded down to 15 kg/m³ after one expansion and down to 11 kg/m³ after a second one. In the latter case it is advisable not to force the first expansion down to minimum obtainable values.
The recommended ageing time before moulding obviously depends on the preexpanded density and ranges from 6 to 72 hours.
Moulding is characterised by fast cycle times. Blocks are cut into sheets of the desired thickness or into shaped articles by means of hot and/or oscillating wires.
It is recommended to keep the product in a dry well ventilated store between 15-20°C.
For product packaged in octabins the guaranteed shelf-life is one month; product in steel drums has a six months guaranteed shelf-life.
During the processing of Expandable Polystyrene any sparkle or flame must be avoided and smoking should be forbidden. An adequate electrical grounding of machinery and of pneumatic transport lines is recommended.
The action of the flame retardant additive is exerted only after the elimination of blowing agent and, therefore, only after has been transformed into foamed articles (suitably aged where necessary).