|
TU
2254-010-02748978-2004
Two-component
polyurethane foam system based on Korundinol
235-1 or Korundinol
235-2 (Component “À”) and “Korundinat
PM” (Component “B”) is designed for manufacture of heat-insulating shells and
other moldings.
1.
Characteristics of Components
à) “Korundinol 235-1” or “Korundinol 235-2” (Component “A”)
|
Name of Parameter
|
Value
|
|
Korundinol 235-1
|
Korundinol 235-2
|
|
Appearance
|
Liquid coloured from light-yellow to dark-brown without visible contaminating impurities
|
|
Hydroxyl number, mg KOH/g, in
the range
|
310 - 380
|
260 – 330
|
|
Mass part of water, %, max.
|
2.6
|
2.5
|
b) Korundinat PM (Component “B”)
according to TU 2472-002-72311668-2004.
2. Processing
Technique
Ratio of mixture À
: B = 100 : 120 (by weight)
Press mold
temperature is +30–350Ñ. Release agent – 8% solution of beeswax in benzine or other silicone
lubricants.
|
Process Test Parameters
|
Value for System
|
|
À-235-1
|
À-235-2
|
|
Start time, s, in the
range
|
20 - 30
|
20 - 30
|
|
Gelation time, s, in the range
|
75 - 90
|
50 - 60
|
|
Apparent density under free foaming,
kg/m3, in the range
|
31 - 37
|
|
Appearance of hardened polyurethane foam and sample
structure
on vertical section
|
Rigid foamed material. Fine-cellular structure with a small number
of larger cells
|
3. Physical and Mechanical Properties of PU System SPU
“KORUND 235”
|
Name of Parameter
|
Value
|
|
À-235-1
|
À-235-2
|
|
Apparent density in the product,
kg/m3, in the range
|
70 - 80
|
60 - 70
|
|
Breaking stress:
- at compression, MPa,
min.
- at bending, MPa, min.
|
0.4
0.65
|
|
|
Compression strength at 10%
deformation, MPa, min.
|
-
|
0.3
|
|
Water absorption for 24
hours, cm3/m2, max.
|
250
|
300
|
|
Heat conductivity,
W/mK, max.
|
0.028
|
0.023
|
|
Softening temperature
by Vika,
at 10 N, 0Ñ, min.
|
150
|
150
|
Packing. Component “À” is poured into 100-250
dm3 aluminium
drums according to GOST 21029, steel drums according to GOST 6247, GOST 13950,
GOST 26155, TU 38.1011264.
Guarantee storage
period:
- of component A -
3 months from day of manufacture;
- of component B -
6 months from day of manufacture.
|
