ABL (STEVENS) Resin & Glass
Unit 4,
TRIPOR 200(LOW Density) Polyurethane Foam
'Tripor 200' is a low density, rigid foam
system which may be used to manufacture mouldings. It
is also suitable for structural infill of fibreglass components, and relies on the thorough
mixing of two
low viscosity
liquids by cither hand or machine mix
techniques.
'Tripor 200'
contains no CFCs or HCFCs and therefore has an Ozone Depletion Potential
(O.D.P.) of zero.
FOAM MANUFACTURE
The foam is produced by the
mixing together of the two Components A and B
at a ratio of I
to 1.16 by weight or 1:1 by volume, it is vitally
important that quantities are accurately measured
before mixing thoroughly. In hand mixing the Component A should be pre-mixed for at least one
minute to aerate it, before mixing with the
Component B. After mixing the foam should be
immediately transferred to the mould or cavity to be
filled. It is essential for the foam to be restricted
and not allowed
to rise freely.
The foam should be processed between the temperatures of 18 -
25"C. Lower
temperatures
will give a slower reaction, higher temperatures
faster. Reaction times
will also be affected
by the bulk mixed, larger amounts will give shorter
times, small amounts longer
times. Surfaces in contact with the rising foam
should be at a temperature of at least 25°C.
The following times arc typical
for a Quality Control procedure for the checking of cream,
string and
rise times, and measurement of the free rise
density. The test should be conducted at a temperature
of20°C, using 32.4grams of Component A and 37.6grams of Component
B mixed together in a cup
of approximately 660ml. volume, stirred intensively
for 10 seconds using a bench stirrer
rotating at
2000rpm. Immediately after mixing, the chemicals are transferred to a second 660ml
cup.
Cream
Time 15-20 seconds (from start of mixing to start of rise)
String Time 150-190 seconds
(from start of mixing to when a thread
can be drawn from rising foam with an inserted
rod
Rise Time 250-300 seconds (from start of mixing to end of rise)
Density (Free rise) 40-42kg/M3 (weight
of cups contents divided
by volume of cup after trimming foam back to
top of cup)
Core Density (Free rise) 36-38kg/M;3 (density of piece
cut from foam core)
Ratio 1:1.16 (by weight)
STORAGE & HANDLING
It is extremely
important that the containers should be re-sealed immediately after use to prevent the
entry of moisture which will adversely
affect the resultant foam. The shelf life of
the materials is
four months when stored in sealed drums within the recommended
temperature
range of 10 • 30°C,
but users are recommended not to hold in
stock longer than necessary.
PLEASE SEE THE SEPERATE MATERIAL SAFETY DATA SHEETS BEFORE
USING THESE PRODUCTS.
The data contained in this
sheet is to bur knowledge true and accurate but recommendations are made
without guarantee or warranty since
application and conditions are outside our control. It is
suggested that users should carry out their own tests
to ensure Tripor'
meets their requirements.