HS321-DS

HS321-DS


1 Product Description
HS321 , is one of the TPC Performance expandable polystyrene products range. It is a free flowing expandable polystyrene grade,consisting of spherical polystyrene beads containing pentane as the expansion agent. Expandable polystyrene (EPS) is normally expanded to achieve the low densities required for final step expansion.The typical density of this grade is around 22 kg/m3,but other densities are possible depending on applications and equipments. HS321 is specially high strength formulated to achieve low density foam without lumps during preexpansion.This grade is not fire retardent ,so it is not suitable for bulding applications.
2 Applications

High Density Block,Shape Molding

HS321 is used as a multi-application packaging material for contour mouldings with a minimum wall
thickness of 10 mm.properly processed EPS foam packaging made from HS321 provides high mechanical
strength also with low densities.it is not hygroscopic and does not become friable in low
t t M ld d EPS k i t h t t h k b b d hi th i t t
TYPICAL DATA SHEET*
GRADE
HS321
WWW.TPCO.IR
IRAN/TABRIZ/TABRIZ PETROCHEMICAL
COMPANY/P.O.BOX:51745-354/TEL:+984134282612
ISSUE DATE Feb-15
temperatures.Moulded EPS packaging parts have to act as shock absorbers and cushion their content
against blows from outside, i.e they have to absorb the energy released in an impact.The mainly closed cell
structure of moulded foam parts made from HS321 absorbs the impact stress as "deformation work". In this
process the air enclosed in the cells is first compressed, while bigger impact forces may also deform or
crack the cell walls.

3 Packaging and storage

HS321 is shipped in octabins (height 176 cm) on wooden pallets (115cm x 115 cm), containing 1000 kg net of material.

The octabins are not weather- or water-proof and must therefore not be exposed to outdoor conditions.

In order to obtain the desired properties of HS321, the raw material should be stored below 20 °C and be processed within 1 month.

4 processing - Moulding

Preexpansion: With discontinuously operating, state-of-the-art preexpanders HS321 can be preex-panded to densities of approx. 22 kg/m3. Lower densities can be achieved by double preexpansion or in optimized machines.

HS321 has been treated with an antistatic agent to prevent a buildup of electro-static charge duringtransport

Intermediate aging:

Intermediate aging should be between 10 and 48 hours.

HS321 can be processed in industry standard moulding machines within a relatively wide range of steaming settings.

If a regenerative agent is added care has to be taken that the density of the regenerative agent equals the preexpansion density as closely as possible to prevent a segregation during production.

PROPERTY UNIT TEST METHOD TYPICAL VALUE
BEAD SIZE MM SUNPOR 7.2.5 (MIN 90% BY WT) (0.7-1)(>90%wt)
K-VALUE − SUNPOR 7.2.4 55
PENTANE CONTENT WT% SUNPOR 7.2.2 5.2%
EXPANDED DENSITY KG/M3 SUNPOR 7.2.6 18-30
RESIDUAL MONOMER PPM SUNPOR 7.2.1 500

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