Core-Bond B600R, Core-Bond B650R, Core-Bond B750R – TDS 1/3
Core-Bond B600R
Core-Bond B650R
Core-Bond B750R
Core Bedding Adhesive
Product Overview
Core-Bond B600R, Core-Bond B650R and Core-Bond B750R are high quality isophthalic polyester resin based core
bonding adhesives specifically formulated for use with structural foam and balsa cores. They are catalysed with standard
MEKP catalyst. It is important to fill all the kerfs and cuts in contoured foam or balsa and have no air entrapment between
the core and the laminate. Priming the core with catalysed resin is recommended practice particularly for higher density
cores. These materials can be applied with a spray applicator or hand trowel.
Features and Benefits
Light weight Half the weight of glass and resin laminate
Smooth consistency Reduced emissions compared to glass and resin
Non sagging Long shelf life
Very low shrink Proven chemistry, long track record
Characteristics Using 1.25% by weight with MEKP Catalyst
A standard 9% active oxygen MEKP catalyst is recommended such as DDM-9, MEKP-9, etc.
Characteristics Typical Value
Working Time/Geltime
1
30 45 Minutes
Fixture Time
2
3-4 Hours
Gap Filling 0.030 inch minimum
1. Geltime measured with 100g mass of adhesive at 75
o
F
2. Time taken at 75 F (ambient temperature) to achieve 80% strength in lap-shear tests
Liquid Properties
Property B600R B650R B750R
Viscosity
3
52,000 64,000 cP 100,000-140,000 cP 116,000-130,000 cP
Specific Gravity 0.57-0.63 0.62-0.68 0.72-0.78
Shelf Life
5
12 Months 12 Months 12 Months
3. Measured using Brookfield HAF with T-C spindle at 5 rpm at 75 F,
4. Mix ratio based on volume and weight for both machine dispensing and hand mixing.
5. Shelf life is defined from date of manufacture when stored under recommended conditions.
Typical Material Properties
Property B600R B650R B750R
Hardness Shore D 60 minimum 60 minimum 60 minimum
Tensile Strength 1450 psi 1450 psi 2000 psi
Tensile Modulus 145 ksi 145 ksi 200 ksi
Tensile Strain 2% 2% 1%
Water Absorption ISO 62 0.0028 oz 0.0028 oz 0.0028 oz
Linear Shrinkage < 1.0% < 1.0% < 1.0%
Core-Bond B600R, Core-Bond B650R, Core-Bond B750R - TDS 2/3
Coverage
Following estimates are based on tests on typical flat laminate roughness. Add material for curvature (opening kerfs and
cuts) to ensure full filling of all the voids within the sandwich laminate.
Saw cut foam
Core-Bond Yield for Saw Cut Structural Foams (estimate)
Core Thickness 1
Adhesive Thickness 1.5 mm 2.0 mm 3.0 mm 3.5 mm
Yield (rounded) 27 ft
2
/gallon 20 ft
2
/gallon 14 ft
2
/gallon 12 ft
2
/gallon
Balsa or knife-cut foams
Core-Bond Yield for Knife Cut Structural Foams or Balsa (estimate)
Core Thickness 1
Adhesive Thickness 1.0 mm 1.5 mm 2.0 mm 2.0 mm
Yield (rounded) 41 ft
2
/gallon 27 ft
2
/gallon 20 ft
2
/gallon 20 ft
2
/gallon
Surface Preparation
As with all adhesives, maximum performance is only achieved with adequate surface preparation. When bonding the
back surface of (polyester) GRP, a simple solvent wipe with acetone is satisfactory pre-treatment to clean and degrease
the surface. However, for gelcoated GRP surfaces and for other substrates, degrease using acetone or similar followed
by abrasion and a final degrease is recommended.
For chemical adhesion to the laminate it is important to bond within the secondary bonding window specified by the resin
manufacturer. This is usually between 24 and 72 hours.
Applications
The triple digit series of Core-Bond are promoted to gel in 45 minutes at 75
o
F with a standard MEKP catalyst. Never
catalyse below 0.75% or above 2.25% by weight. Contents may settle in during storage and shipment therefore it is
recommended to mix the material prior to catalyzation to ensure homogeneity. Using a notched trowel apply the correct
thickness of material for your core choice and surface curvature. The higher density and viscosity Core-Bond B750R is
better suited for vertical surfaces to eliminate any sagging.
Core material should be primed with a catalysed resin to improve the bond. An orthophthalic based resin with low styrene
is recommended such as the Priming Resin R101 from Scott Bader. Some isophthalic or vinyl ester resins are not
suitable for priming PVC or SAN foams. If in doubt: test! Apply the right amount of priming resin to the core material
avoiding excess. The texture of the core should remain visible.
After bonding tap the surface of the core to test for any voids using a coin. A dull or hollow sound will indicate voids.
Repair areas with voids before final lamination.
Refer to the Core-Bond Manual for more detailed information on core bedding methods.
Contact your local Scott Bader representative for questions or assistance with the selection of adhesives for your use.
This product is intended for use by skilled individuals at their own risk. Recommendations contained herein are based on
information we believe to be reliable. The properties and strength values obtained under controlled conditions at the
Scott Bader laboratory.
Storage
Store between 60 and 80 F in the original, unopened container in a dry, well ventilated place. Protect from direct
sunlight. Exposure to temperatures outside of these conditions will reduce shelf life. Ideally containers should be opened
only immediately prior to use.
Packaging
Available in 5 gallon (19 litre) plastic or metal pails and 50 gallons (189 litre) drums.
Health and Safety
See separate Safety Data Sheet.
Core-Bond B600R, Core-Bond B650R, Core-Bond B750R - TDS 3/3
Updated: November 2017
All information on this data sheet is based on laboratory testing and is not intended for design purposes. Scott Bader makes no representations or warranties of any
kind concerning this data. Due to variance of storage, handling and application of these materials, Scott Bader cannot accept liability for results obtained. The
manufacture of materials is the subject of granted patents and patent applications; freedom to operate patented processes is not implied by this publication.
SCOTT BADER North America
4280 Hudson Drive, Stow, Ohio, United States, 44224
Telephone: +1 (330) 920-4410
Facsimile: +1 (330) 920-4415
www.scottbader-na.com
SCOTT BADER COMPANY LIMITED
Wollaston, Wellingborough, Northamptonshire, NN29 7RL
Telephone: +44 (0) 1933 663100
Facsimile: +44 (0) 1933 666623
www.scottbader.com