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Fast grade - brief introduction to the properties of EPS raw material
 
Specifications of Fast grade EPS

GRADE

BEAD SIZE

(mm)

 

PRE-EXPANSION
RATE

APPLICATION

PKF-301XS

1.00-1.60

50-70

Low density, high circle molding

PKF-302XS

0.85-1.25

45-65

General product with thickness over 12 mm and large packaging molding

PKF-303XS

0.70-1.00

40-60

Medium-density packaging and thin wall packaging moldings

PKF-401XS

0.50-0.80

40-55

Packaging with thickness over 8 mm and high density articles

PKF-501XS

0.40-0.60

30-50

Packaging with thickness over 6 mm and high density articles

PKF-601XS

0.30-0.50

20-40

Lost foam process and special articles

 

Fast grade EPS gives excellent properties to processing procedures and products
1. Uniform original particles, and good fluidity of the particles.
2. No bad odor during pre-foaming and molding processes.
3. Shore curing time.
4. High cooling speed on the automatic molding machines; the effect is even better in the case of vacuum cooling.
5. Uniform and fine particle pores, smooth and attractive appearance of products.
6. Good internal conjunction of finished products, high impact resistance.
7. Compliance with food grade requirements, and capability of safely contacting daily necessities.
8. Recommendation for foaming ratio of 40 to 60 times.

 

Physical properties of molded products

 

Property

Unit

Density(kg/m3)

15

20

25

30

Compressive Resistance (Distortion 10%)

KPa

65-110

100-160

140-210

180-225

Bending Strength

KPa

160-210

240-300

325-400

410-490

Stretch Strength

KPa

150-230

225-325

260-415

375-510

Linearity Thermal Expansion Coefficient

1/K

6*10-5

Max. Heat Exchange Ratio

W/(m*k)

0.35

Specific Heat

KJ/(kg*k)

1.21

 

Recommended processing conditions
1. Material Selection
Select particle diameters according to the requirements for the shape and density of the product; select 302XS or 301XS for large products with low density (less than 16 g/l), select 302XS or 303XS for continuous pre-foaming machines, and select 303XS/401XS/501XS for intermittent pre-foaming machines.
2. Pre-foaming
Steam pressure: 0.15MPa-0.30MPa
Pre-foaming temperature: 96-108℃
Curing time: 4-24 hours
3. Forming
Solid mold steam pressure: 0.7-1.2kgf/cm2
Mobile mold steam pressure: 0. 75-1.2kgf/cm2
 

Health and Safety
1. Fast EPS raw materials completely meet the requirements of food grade products, with a residual monomer content of less than 0.2% wt, which can safely contact with food. The total content of aromatic impurities is significantly lower than similar products.
2. During storage, transportation and processing, it can produce a small amount of pentane of foaming agents, of which the explosion limit concentration in the air is 1.1-6.0%; therefore, the raw materials and products must be stored in a well-ventilated area away from open flames and free of statics.

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