GRAVICOL® Product Guide - Resipol

GRAVICOL ®
Product Guide

GRAVICOL ® BONDING PASTES
The GRAVICOL ® range of bonding pastes are designed for the assembly and bonding of glass
reinforced plastic moldings.
All of the bonding pastes in the range are pre-accelerated and require only the addition of a
standard MEKP catalyst. The pastes can be used for bonding two parts, insert panels, core materials.
They can also be used for cavity filling and as an aid to lamination to help reduce the chance of air
voids. When designing the bonding pastes there are several key areas we look at and control to
suit the numerous application areas of the pastes :
- Gel/Cure Times - Low Shrinkage Levels - Application Methods - Mechanical Properties
Gel/Cure Times
The products are available with a range of gel/cure times, but are
designed to cure with a low peak exotherm, which assures no
deformation of the parts being bonded.
Low Shrinkage
The low shrink properties of the paste assure that there will be
no ‘pull through’ on the parts bonded. Full bond strength will be
retained as the paste does not pull away from where it is intended
to be, this also allows the bond to form a water/air tight seal.
Application Methods
The physical characteristics of the pastes vary across the range to
suit the different application techniques, which are typically :
-By hand, comb or spatula
-By application equipment which can dispense catalysed material
in a ‘bead’ of adjustable diameter or in a small spray pattern to
cover larger areas more quickly
Mechanical Properties
The different mechanical properties in the range allow you to choose a paste specific to your bond
requirements. Within the range of pastes there are grades with and without glass fibres to suit the
different types of application within the construction of composite parts.
GRAVICOL ® PRODUCTS WITHOUT GLASSFIBRES
For use in thinner joints.
GRAVICOL®
2503 R : A fast, rigid paste with a low level of shrinkage. Suitable for all types of
gluing, filling in and fixing. Economic grade. Available in STD and WHITE.
®
GRAVICOL 2040 : A semi-flexible smooth paste with a low level of shrinkage. This paste has a
longer gel time so it can be used for larger jobs such as fixing core materials or balsa. Available in
TC and IHB TC.
®
GRAVICOL 2039 : A flexible and smooth paste with a low level of shrinkage. It can be used for
bonding, fixing inserts and also as an aid to laminating. Available in TC, IHB TC, WHITE and IHB
WHITE.
GRAVICOL®
3128 : A flexible paste that can be
applied with a spatula, it has excellent adhesion
properties with PVC foams. Available in STD and
IHB.
GRAVICOL®
D 09 : A semi-flexible low density
paste with very low shrinkage. The material can be
applied with a spatula and is used for composites
where final part weight is a consideration.
Available in STD and IHB.
GRAVICOL®
1120 : A semi-flexible, translucent
paste with a fast gel time. Can be applied with a
spatula. Only the STD version is available.
GRAVICOL®
2038 machine : This product has had its viscosity adapted to suit application via a
machine. Only available in the TC version.
ABBREVIATIONS
RANGE OF GRAVICOL ® PRODUCTS
The GRAVICOL ® range of products have been formulated with and without glass fibres. They
are available with a range of properties to suit various applications.
P
STD
Packaging in plastic bag.
Standard material with a typical gel time of about 20 minutes.
GRAVICOL ® PRODUCTS WITH GLASSFIBRES
For use in areas or joints where a thicker application is needed.
GRAVICOL®
2505 : A rigid paste with a short gel time and a controlled level of shrinkage. Used for
application in static bonds. Only the TC variant is available.
GRAVICOL®
2427 : A semi-flexible paste with a low level of shrinkage. Used for filling and bonding
applications. TC and IHB TC versions are available.
GRAVICOL®
2397 : A flexible paste with a low level of shrinkage.
Recommended for use in areas or joints where a thicker application
is required, it can also be used for bonding reinforcements to
substrates. TC and IHB TC versions are available.
GRAVICOL®
2782 : A semi-flexible, translucent paste. Only the
TC version is available.
®
GRAVICOL 3410 : A very fast, semi-flexible paste. Catalysed
with benzyl peroxide. Only the STD cream version is available.
IHB Material with an inhibited gel time.
TC Contains catalyst indicator.
WHITE Contains white pigment paste.
PACKAGING
Standard pastes are available in 25 kg metal pails or 250 Kg drums.
D09 is available in 18 Kg metal pails or 180 Kg drums.
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GRAVICOL ® USE AREAS AND APPLICATION
INFORMATION
Making and bonding composites can often be a complex process involving several different parts
and even different material types being involved. In these structures the bond must have the correct
strengths and properties to adhere well with all of the materials used and to cope with the
stresses of the end use of the composite part. A good indicator that a bonding paste has achieved
this is when a failure at a joint is seen within the laminate and not within the bonding paste.
A GOOD BOND
A
good bond depends not only on your choice of bonding paste but also the preparation of and the
geometry of the joint.
The thickness of the joint and the level of stress a joint will have to endure govern the choice
of bonding paste used.
For thicker joints over 5mm glass filled paste is best as the
glass fibres add strength to the bond itself.
For thinner joints less than 5mm a paste with glass fibres
is not needed, just a flexible or semi-flexible paste is
needed, depending on the stress within the joint.
For joints with stress a more flexible grade of paste is
needed like GRAVICOL ® 2427 or GRAVICOL ® 2397 used in
boat market.
For static joints without stress a semi-flexible paste will be
sufficient like GRAVICOL ® 2505
in tank market.
Prepare the
For all bond types our recommendations,
to ensure the best possible adhesion
are to prepare the contact surfaces
with some light abrasion and then
solvent wipe them to ensure that
they are free of all grease, oil and contaminants.
The GRAVICOL ® materials can be applied by either an application machine
or by hand depending on the volume of material being used.
BONDING CORE MATERIALS
Core materials can be bonded onto composite skins to add
strength and insulation to parts whilst retaining lower overall
weights, these materials are usually a foam or balsa material.
The types of paste used for this application are usually without
fibres; the pastes must have low exotherm temperatures and a
low level of shrinkage to ensure that no surface distortion is
caused.
GRAVICOL ® 2039 and 2040 would be most
The pastes suitable for this type of application. For this job
the paste is usually applied with a comb or
must have notched spatula, and obviously the gel time
required depends on the size of the job at
low exotherm
hand.
temperatures To bond PVC foam, GRAVICOL ® 3128 is recommended.
and a low level
of shrinkage
contact
surfaces with
some light
abrasion and
then solvent
wipe them.
Note: Care must be taken when using GRAVICOL ® to bond metals, woods; thermoplastics, parts produced by
RTM and parts made from SMC or BMC to ensure that the parts give a good level of adhesion. Each type of
material must be taken case by case.
GRAVICOL ®
GAP FILLING
The GRAVICOL ® pastes can be used as a gap filler and sealant for certain and
applications. Hard to laminate and intricate areas can have the paste applied
into them before being laminated over or having inserts or core materials placed shrinkage
over them.
properties to
Pastes used for these purposes must have low exotherm and shrinkage
properties to avoid causing distortions in the surface of the laminates. Also the avoid causing
mechanical properties of the paste must be considered to ensure that the paste distortions in
can cope with the types of stresses associated with the bond.
GRAVICOL ® 2039 or 2397 would be suitable for this type of application as their
the surface of
flexibility makes them the laminates.
resilient to stresses
and impacts.
The GRAVICOL ® 2397
is formulated with
glass fibres in it and is
therefore more suitable for heavy gap filling
applications as the glass adds strength to the
bond itself.
GRAVICOL ®
LAMINATING AID
The paste can be used to fill small lips,
edges and detail on parts that are
difficult to laminate. The part can then be
laminated in the normal way either
whilst the paste is still
wet or once it has cured.
The paste then
holds the glass
in place
reducing the
chances of air
voids and
bubbles within
the laminate.
The paste can also be
applied in a thin film
behind the gel coat in
curves and radii, the
fibre glass can then be
pushed into the paste,
the paste then holds
the glass in place
reducing the chances
of air voids and
bubbles within the
laminate.
Low
exotherm
GRAVICOL ® 2039 and
2427 both have low
levels of shrinkage
and low peak exotherm temperatures and are ideal for these applications.
The materials are usually applied in a thin layer, by brush using 1% MEKP.
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SUMMARY OF RANGE OF GRAVICOL
BONDING PASTES WITH FIBRES
®
Paste Properties Cured Paste Properties Application Areas
Product
Appearance
Gel Time/ mins
Catalyst
Bond Development
Time/hrs
Elongation %*
Flexural Strenght/Mpa
Shrinkage %
Bonding
Aid to laminating
Gap filling
Comments
2427 TC
1000 grams of material
Thixotropic Paste 15-23 5 3.9 3,9 34 0.17 0,17 • •
at 23°C using 1% MEKP
Semi-flexible bonding paste for filling
and bonding applications
1000 grams of material
2427 IHB TC Thixotropic Paste 45-65 6 3.9 34 0.11
at 23°C using 1% MEKP
•
Inhibited variant of 2427 TC
1000 grams of material
at 23°C using 1% MEKP
2505 TC Thixotropic Paste 7-11 6 4.1 30 0.31 • •
Semi-rigid bonding paste used for application in static bonds.
Very fast gel time
1000 grams of material
2782 TC Translucent Thixotropic Paste 20-30 5 2.9 20 0.40
at 23°C using 1% MEKP
•
Semi-flexible and translucent bonding paste
1000 grams of material
3410 STD Cream 9310 Cream Thixotropic Paste 6-9 6 3.9 28 0.06
at 23°C using 1% PBO
•
Semi-flexible bonding paste, catalysed with benzyl peroxyde.
Very fast gel time
1000 grams of material
2397 TC P Thixotropic Paste 17-25 at 23°C using 1% MEKP 6 5.4 40 0.25 • •
Flexible bonding paste used for application in dynamic bond
1000 grams of material
2397 IHB TC Thixotropic Paste 40-50 at 23°C using 1% MEKP 10 5.4 40 0.51 •
Inhibited variant of 2397 TCP
*Measured on the base resin
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®
SUMMARY OF RANGE OF GRAVICOL BONDING PASTES WITHOUT FIBRES
Paste Properties Cured Paste Properties Application Areas
Product
Appearance
Gel Time/mins
Catalyst
Bond Development
Time/hrs
Elongation %*
Flexural Strenght/Mpa
Shrinkage %
Bonding
Aid to laminating
Gap filling
Comments
1000 grams of material
at 23°C using 1% MEKP
2039 TC Thixotropic Paste 14-22 6 7.4 35 0.90 • • • Flexible and smooth bonding paste
2039 IHB TC Thixotropic Paste 40-50
1000 grams of material
at 23°C using 1% MEKP 7 7.4 35 1.00 • Inhibited variant of 2039 TC
2039 STD WHITE White Thixotropic Paste 14-22
1000 grams of material
at 23°C using 1% MEKP 6 7.4 35 1.10 • White variant of 2039 STD
2039 IHB WHITE White Thixotropic Paste 40-50
1000 grams of material
at 23°C using 1% MEKP 7 7.4 35 1.30 • White variant of 2039 IHB TC
1000 grams of material
3128 STD Thixotropic Paste 24-36 at 23°C using 1% MEKP 6 7.4 37 1.30 •
Flexible and smooth bonding paste with excellent
adhesion properties with PVC
3128 IHB Thixotropic Paste 40-50
1000 grams of material
at 23°C using 1% MEKP 10 7.4 37 1.50 • Inhibited variant of 3128 STD
2040 TC Thixotropic Paste 60-90
1000 grams of material
at 23°C using 1% MEKP 4 3.7 29 0.35 • Semi-flexible smooth bonding paste used for larger jobs
2040 IHB TC Thixotropic Paste 135-195
1000 grams of material
at 23°C using 1% MEKP 6 3.7 29 0.82 • Inhibited variant of 2040 TC
1000 grams of material
at 23°C using 1% MEKP
2503 R Thixotropic Paste 13-21 6 2.6 25 0.23 • • Rigid bonding paste economic grade
1000 grams of material
2503 R WHITE White Thixotropic Paste 13-21 at 23°C using 1% MEKP 6 2.6 25 0.18 • White variant of 2503 R
Translucent
1000 grams of material
1120 STD 20-30
Thixotropic Paste
at 23°C using 1% MEKP 7 7.4 41 1.70 • Flexible bonding paste translucent
1000 grams of material
at 23°C using 1% MEKP
D09 Thixotropic Paste 9-15 6 3.9 20 0.10 • • Semi-flexible low density bonding paste
1000 grams of material
at 23°C using 1% MEKP
D09 IHB Thixotropic Paste 45-65 7 3.9 20 0.68 • • Inhibited variant of D09
1000 grams of material
2038 MACHINE TC Thixotropic 25-35 at 23°C using 1% MEKP 7 7.4 35 0.15 •
Flexible bonding paste with a viscosity adapted
to suit application via a machine
*Measured on the base resin
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STANDARD TEST METHODS FOR GRAVICOL ®
PRODUCTS
B elow are listed a variety of tests we use to check the properties of the bonding pastes :
Gel time : the gel times are tested under controlled conditions 1Kg of material at 23°C using 1% MEKP.
Peak exotherm : a mass of product is prepared and catalysed under controlled conditions and the highest
temperature that mass reaches is recorded as its peak exotherm.
Density : the density of the product is measured; this is of particular importance
to low density grades of GRAVICOL ® .
Mechanical properties : both flexural and compressive strengths of the
GRAVICOL ® pastes are measured.
Shrinkage level : this is measured by casting products into moulds of
known dimensions and then measuring the level of shrinkage away from the
edges of these moulds.
Adhesion, bond development time : this is determined by bonding two
laminates together and then pulling them apart at hourly intervals after
catalysation to determine the time taken to develop full bond strength. This
point is reached when the bond failure is in the laminate and not in the
bonding paste.
Elongation at break : the elongation is measured, again as an indicator to mechanical properties.
HEALTH AND SAFETY
Health and Safety data sheets are available for each grade of bonding paste upon request.
Symbol
R10
R20
Xn Harmful
Flammable
Harmful by inhalation
R36/38 Irritating to eyes and skin
S23
S51
Do not breathe vapour
Use only in well ventilated areas
Storage :
The GRAVICOL ® products should be stored in their original packaging.
The storage temperature should be between 15 and 25°C.
The products should be kept away from all sources of ignition, excessive heat and direct sunlight.
Once a container has been opened it should subsequently be stored in an upright position with
its original lid firmly in place.
Rotate stock, make sure older material is used first; the shelf life of GRAVICOL ® products is 6 months.
STANDARD USAGE RECOMMENDATIONS
The GRAVICOL ® range of bonding pastes is pre-accelerated and
ready to use, requiring only the addition of the appropriate MEKP.
Under normal application conditions (15-25°C), the pastes should be
catalysed between 1.0% (minimum) and 3.0% (maximum).
Personal Protection Recommendations :
When using the material personnel must have the appropriate personal protection equipment :
Safety glasses
Solvent resistant gloves
Overalls
Mix in the catalyst thoroughly.
The surfaces of the parts to be bonded should be free of dust
and contaminants to ensure the best level of adherence.
The surfaces
of the parts
to be bonded
should be free
of dust and
contaminants
to ensure the
best level of
adherence
If necessary the surface of the parts should be
abraded and solvent wiped.
The material can be applied to a part using application equipment, a spatula, a
brush or comb.
The two parts should be pressed together ensuring an even thickness of
glue throughout the bonded part.
Once the bonded part is in place be careful not to move it too soon, as
this may lead to a ruptured or weakened bond. (Ideally the part should
not be moved until it has been left to stand for its full bond development
time.)
Take care, when bonding together parts that utilise an LSE type resin system,
it is usually necessary that these types of parts must have their surfaces
abraded and solvent wiped to allow good bond adhesion.
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CRAY VALLEY Communication • Mars 2005
Industrie à Messages - crédits photos :Serge Rivoallon, Philippe Galard. Photos non contractuelles