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LD40 Rigid Foam System
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Description
LD40 is a two component, 1:1 ratio, CFC & HCFC FREE rigid
foam system which when processed through suitable dispense
machinery will produce a rigid foam of approximate density
40 kg/m³ with good compressive strength, cell structure and
other physical properties.
Uses
LD40 is a general-purpose system for use in a wide variety of
moulding applications where the foam needs gradual rise.
LD40 is used in the thermal insulation of large panels, water
heaters, storage tanks, refrigerated containers, behind produce
store pressure walls and related double skin applications. It is
particularly useful for the filling of large volumes where its
gradual rise and excellent flow properties are used to best
advantage.
Equipment
LD40 can be processed through all standard foam dispense
equipment. The machine should be capable of maintaining the
mix ratio at ±2% accuracy and controlling the component
temperatures at 20 - 50oC. Consult Isothane technical staff for a
specific recommendation.
Component Description
LD40 RESIN is a fully formulated liquid mixture. It should be
stored in sealed tanks or drums and ideally should be heated to
20 ± 5° C before use.
M27 ISO is a liquid mixture containing crude
diphenylmethanediisocyanate. It should be stored in sealed
tanks or drums and ideally should be heated to 20 ± 5° C before
use.
Stored under the above conditions the system has a shelf life of
6 months. See page 2 for component properties.
LD40 is a two component, modified polyurethane rigid foam which, processed through
suitable foam machinery, gives a product of nominal density 40 kg/m³.
Laboratory test results (typical):-
| Cream Time |
13 - 18 seconds |
| Rise Time |
140 - 168 seconds |
| Free Rise Density |
31 - 34 kg / m³ |
Storage, Handling And Personal Protection
The recommendations in our Safety Data Sheet for this product must be followed at all
times. More general information is included in our publication “A Guide to the Safe
Handling of Polyurethane Chemicals” and in the following Technical Data Sheets which
are available on request:-
- Fire safety when Storing, Handling and Installing Polyurethane Foam.
- Decontamination of Isocyanates using Isothane Decontaminant.
Typical Properties
|
LD40 RESIN |
M27 ISO |
| Appearance |
Light amber liquid |
Dark brown liquid |
| Viscosity |
400 cps @ 20° C |
150 - 270 cps @ 25° C |
| Specific Gravity |
1.12 - 1.18 @ 20° C |
1.24 ± 0.02 |
| Mixing Ratio |
100 parts by wt. |
109 parts by wt. |
|
100 parts by vol. |
100 parts by vol. |
| Process |
Moulding / Cavity Fill |
|
Typical Properites of LD40 Foam Core
|
Value |
Method |
| Core density |
37 kg / m³ |
BS 4370 |
| Compressive strength Parallel to rise |
210 kN / m² |
BS 4370 |
| Shear Tensile strength Perpendicular to
rise |
241 kPa |
BS 4370 |
| Closed Cell Content |
90 % min |
BS 4370 |
| Thermal Conductivity 20° C Mean - Initial |
0.0213 W / mK |
BS EN ISO 12667 |
| - Aged |
0.0234 W / mK |
BS EN ISO 12667 |
| Ozone Depletion Potential |
ZERO |
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