NON‑CFC RIGID LOW DENSITY
POLYURETHANE FOAM SYSTEM
In practice the density will be influenced by the configuration of the
cavity in which the foaming process takes place.
Restrictions to flow will result in increased density.
Variations from recommended temperatures for components and moulds
will also effect moulded density.
Warming of both components Polyol and Isocyanate to 25°C will significantly improve the efficiency and flow of the system
The quantity of system will generally be greater than the calculated
quantity to allow for residues in weighing and mixing containers, the
amount of overpacking required to fill the void/mould shape, and the
quantity of material mixed for each pour/mix.
Procedure All materials and equipment should be prepared and set up in
advance to ensure rapid and efficient sequence from the time the
operation is started.
(1) Accurately weigh the required quantity per pour/mix of Polyol into a dry, clean container.
(2) Immediately add the required quantity of Iso (same weight as polyol)
to the same container.
(3) Immediately mix the two components using a high speed mixing blade and
as soon as mixing is complete, pour into mouldlvoid space. Mixing time of
approximately 20 seconds is normally sufficient.
Mixing A power operated mixer Is essential.
As a general rule minimum requirement is a speed of 2500 RPM with a blade
capable of giving high shear with adequate turbulence. Mixing time must be
long enough to give complete mixing, but short enough to ensure that mix
and pour operations are complete within the Cream Time of the system,
typically 30‑35 seconds.
There are a number of machines from several manufacturers suitable for use
with the Pouring Foam Series
of systems. Minimum
requirements are capability for accurate metering and timing of shots, and
ability to maintain temperature of components within a limit of ± 2°C
of the selected temperature for each component.
For most applications a temperature of 25°C
for polyol and iso is required. Viscosities and react" figures may be
changed by controlled temperature variation within operational limits.
When using the Pouring Foam
system through polyurethane spray foam equipment, Gusmer/Grayco or
similar, in 'injection' applications similar temperature settings are
used. The application conditions are important in determining the
appropriate temperature settings for the two components.
Suitable moulds can be made from sheet metal, fibreglass (fro) or filled epoxy systems. To facilitate release, mould surfaces must be smooth and polished and a coating of release agent must be applied between each process.
LIMITATIONS AND HAZARDS
· Use only in temperature condition where the maximum contact surface temperature is +85°C and the minimum contact surface temperature is ‑50°C.
STORAGE AND HANDLING
Both product containers must be kept sealed.
Both components are moisture sensitive.
The Polyol component (Part B) is hygroscopic (will absorb water vapour
from the air) which affects its reaction with he Iso (part A) component.
The Iso component will react with absorbed water vapour resulting in
Always wipe the threads of the Iso container clean with a clean rag prior
to replacing the screw lid.
Failure to do so will result in the Iso acting as a glue and “gluing” the
lid to the container.
The Polyol component (Part B) contains a blowing agent which will
evaporate if the container is not kept sealed.
The loss of this component will cause a reduced amount of blowing
and thus the volume yield will be reduced.
If available, use a Dry Gas spray into each can prior to sealing.
Use the dry gas in accordance with the directions provided with the
dry gas. This will largely
eliminate moisture access to the components.
Store internally at 18°C
Avoid storage near sources of radiated heat or against external walls
subject to significant temperature variations.
Please refer to MATERIAL SAFETY DATA SHEETS for precautions for safe handling and working with each component of the system, danger to certain individuals and decontamination of spills.
Please call Boatcraft Pacific 07 3806 1944 ( +617 3806 1944) for how to contact your nearest reseller.
Copyright Boatcraft Pacific Pty. Ltd.