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ТУ 2254-018-72311668-2005
Two-component system SPU “Corundum 425” based on “Corundinol
425-1”
or “Corundinol 425-2” (component “A”) and “Corundinat
PM” (component “B”) is intended for production of heat-resistant
“sandwich-panels” using periodical method.
During the processing of the components can be
used machines as of high pressure, as of low. Recommended temperature of the
equipment during processing is +20 ÷ 300С. Component “A” contains freon 141b as foaming
agent.
COMPONENTS’ CHARACTERISTICS:
Component «А» - «Corundinol 425-1» или «Corundinol 425-2»
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Characteristic name
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Corundinol 425-1
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Corundinol 425-2
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Appearance
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Liquid of light-yellow to dark-brown colour
without foreign impurities
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Hydroxyl number, mg, in the range
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280 - 330
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250 - 320
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Mass share of water, %, in the range
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2,0 – 2,5
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2,1 – 2,6
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Component «B» - «Corundinat
PM» by ТУ
2472-002-72311668-2004.
Component ratio during
processing:
А : B = 100 : 120 (by
mass)
TECHNOLOGICAL PROBE INDEX *
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Characteristic name
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А - 425-1
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А - 425-2
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Starting time, s
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25 -50
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20 - 30
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Gelatinization time, s
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120 - 200
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90 - 125
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Apparent density during free foaming, kg/m3, in the range
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25 - 35
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25 - 35
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Appearance of solid poliurethane and
structure on the parallel cut
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Solid foamed
material of soft-celled structure with few consolidated cells
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PHYSICAL AND MECHANICAL
CHARACTERISTICS OF PPU *
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Characteristic name
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Value
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А - 425-1
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А - 425-2
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Apparent density in unit, kg/m3, in the range
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40 - 46
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40 - 50
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Breaking stress under bending, kPa, not
lower
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350
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350
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Breaking stress under pressing, kPa, not
lower
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250
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250
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Water absorption for 24 hours, %, not higher
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2,5
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2,5
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Coefficient of thermal conductivity, Vt/m×К, not higher
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0,025
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0,025
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Softening temperature under the load of 10Н, 0С, not
lower
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150
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150
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* Presented characteristics can be changed on
demand of the customer according to the aims of technological process.
Package. Component «А» is
poured into aluminium barrels by ГОСТ 21029, steel barrels by ГОСТ 6247, ГОСТ
13950, ГОСТ
26155, ТУ 38.1011264 with
capacity in range from 100 to 250 dm3.
Guarantee shelf life:
- component А - 3 months from the day of production;
- component Б – 6 months from the day of production.
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