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Topics Covered
Introduction
Some of Our Most Popular
Polymer Adhesive Systems
Advantages of Adhesive Bonding Over
Alternative Assembly Techniques
Joint Design Considerations
Adhesive Joint
Types
Adhesive
Joints for Bonding Thin
Cross-Sections
Surface Preparation to Ensure Adhesive Joint Integrity
Epoxy Adhesives – Leading The
Way
Improved Peel
Strength and Heat Resistance
Improved Thermal Stability
Customized Packaging
to Customer Specifications
About Master Bond
Master
Bond offers unique polymer adhesives to meet specific performance and
processing requirements. These versatile compounds can be cured at ambient
temperatures, elevated temperatures and upon exposure to UV light. Our line of
products consists of epoxies, silicones, polyurethanes, polysulfides
and cyanoacrylates.
Specific grades offer:
- Improved Durability
- Abrasion Resistance
- High Physical Strength Properties
- Gap-Filling
- Fast Cures
- Low Stress
- Easy Application
- NASA Low Outgassing Approval
- Superior Electrical Insulation Properties
- Thermal and Electrical Conductivity
- Withstands Exposure to a Wide Range of Chemicals and Water
- High Bond Strength to Similar and Dissimilar Substrates
- Resistance to Vibration, Impact, Shock and Thermal Cycling
- Comply with UL94V-0 Flame Retardant Specification
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Master
Bond polymer adhesives are successfully employed in industries ranging from
aerospace,
optical and
electronics
to oil/chemical processing, medical and automotive. Our products are designed to speed
productivity, reduce waste, save energy and enhance performance. We can
recommend a formulation tailor-made to meet your needs.
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Master
Bond's popular polymer adhesive systems are given below.
| Product |
Description |
| EP30HT |
Two part, room temperature curing epoxy that is optically clear,
high temperature resistant and meets NASA low outgassing requirements. |
| MB300 |
One component cyanoacrylate cures in seconds at room temperature,
very high strength & bonds to a wide variety of substrates, including most
plastics and metals. |
| MASTERSIL
711 |
One component, rapid setting silicone RTV, will set up in a few
minutes; high flexibility and serviceable up to 400°F. |
| SUPREME
11HT |
Two part room temperature cured adhesive. Service temperature
range -100°F to 400°F. High peel & shear strength. 1:1 mix ratio. Resistant
to shock, vibration and impact. |
| EP17 |
One part heat cured epoxy system. Heat resistant to 600°F. High
compressive and tensile shear strength. Excellent toughness and resistance to
thermal cycling, shock and vibration. |
The advantages of adhesive bonding over alternative assembly
techniques are outlined in the following list:
- Improved stress distribution; stresses are evenly distributed over the
entire bonding area thereby minimizing high localized stress concentrations.
- Outstanding fatigue resistance of adhesively bonded joints especially to
cyclic loading.
- Superior resistance to mechanical shock and vibration even upon prolonged
exposure to hostile environmental conditions.
- Ability to bond dissimilar as well as similar materials including metals,
plastics, elastomers, glass, ceramics and wood.
- Outstanding humidity and corrosion resistance at both ambient and elevated
temperature conditions.
- Superior thermal resistance.
- Availability of adhesive formulations for a wide range of service conditions
from as high as 600°F to cryogenic environments.
- Adhesively bonded surfaces feature smooth contours free from gaps and
external projections unlike rivets and other mechanical fasteners.
- Less critical tolerances acceptable for high performance bonding compared to
mechanical fastening methods.
- Substantial weight and significant cost savings without decrease of
pertinent bonding strength parameters.
- Unexcelled dimensional stability and long term durability.
- Techniques are available for disassembly of adhesively bonded assemblies
without deleteriously affecting the individual components.
With structural adhesives, joint design is as important as adhesive
selection. Joint design requires selection of the correct style, proper surface
preparation, and use of careful applications and assembly procedures. Joint
design should minimize stress concentrations by ensuring that the load is
distributed over the entire bonded area. Some stresses, such as peel, cleavage,
and shear stresses, should be minimized. Most structural adhesives withstand
tensile stress well, so joints should maximize this type of stress and minimize
others.
Joint style should serve to improve bond strength. Some joints used in
structural applications include butt, scarf, lap, and offset lap. Butt joints
are used when stress forces are concentrated along the bond line and when force
perpendicular to the bond are minimal. Scarf joints allow a large adhesive
contact area, but parts joined in this way must maintain a close fit.
Lap and offset lap joints are recommended for bonding thin cross-sectional,
rigid parts. In lap joints, the bonded parts are slightly offset; thus, peel and
cleavage forces develop when the joints are under load. These forces can be
minimized by using the offset lap joint.
Surface preparation is critical. Surfaces are often contaminated with oil,
grease, dirt, moisture, or other contaminants, so they must be cleaned before
adhesive is applied. Certain forms of oxidation, such as the loose rust formed
on iron, can contaminate adhesive. However, some metals, such as aluminum and
copper, form oxide layers that cling tenaciously to the substrate and form a
satisfactory surface for adhesives. Glass and some other substrates require
special surface treatments to maintain good bonds.
Failure to follow recommendations for adhesive application and processing is
a major cause of bond failure. Often, cure temperatures are raised and cure
times shortened to get a faster cure. Yet, adjusting cure rates and temperatures
may result in weak bonds.
Much progress has been made in the last few years in improving performance
characteristics of epoxy adhesives . These advances relate to improving toughness
and peel strength, increasing their high-temperature service capabilities and
upgrading their resistance to water and other chemicals, including fuels and
lubricants, at elevated temperatures. Also, for one-component pastes and films,
shelf life without the need for low-temperature (40°F) storage has been
substantially extended and cure schedules shortened while bonding properties are
retained and sometimes advanced. Much of this development work was stimulated by
the needs of aerospace industries for lighter weight, more fuel- efficient
aerospace
components.
The gains achieved in upgrading peel strength and heat resistant
characteristics of epoxy adhesives are particularly impressive. Epoxy adhesives
have traditionally exhibited high- tensile shear strengths but have shown
low peel strength, a marked disadvantage for many bonding operations. This
deficiency is being overcome by more sophisticated chemistry and formulation
technology including modification with liquid elastomers. Furthermore,
epoxy-based adhesives with greatly improved peel strength retain the desirably
high tensile shear strengths typical of these materials.
Equally significant are the improvements in thermal stability for one and two
component epoxy-based adhesives. Today's advanced epoxy adhesive
systems perform quite satisfactorily at temperatures at and above 500°F. The
key to this remarkable development has been the production of new heat-resistant
epoxy resins based on novel chemical structures. These advanced epoxy resins can
be cured over a wide temperature range with specially designed curing agents and
give impressive bond strengths.
Master
Bond offer a wide array of packaging options to speed productivity, minimize
waste and save energy including:
- Quantities from grams to gallons
- Cans, bottles and jars
- Cartridges for manual and pneumatic guns
- Premixed and frozen syringes for two part systems
- Bipaks for field service kit
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Master
Bond is an adhesive manufacturer offering over 3,000 different grades of
specially designed adhesive bonding formulations. The adhesives differ in
viscosity, cure speed, temperature resistance, chemical resistance, strength,
electrical properties, color etc. These bonding adhesives are specifically
designed to solve design, manufacturing and repair/maintenance problems. They
will increase productivity, reduce waste, save energy and improve your products
performance.
Source: Master Bond Inc.
For more information on this source please visit Master Bond Inc.