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Adhesive
Calculation
Table(pdf)
 Spanish Edition |
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Adhesive
World Wide
Minimum Order
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Why Methacrylates?...A Comparison between Epoxies, Urethanes and
Methacrylates*
Epoxies
Advantages
·
Usually low priced
·
Good gap filling capabilities
Limitations
·
Adhesives thin during curing cycles
Advantages
· Moderately priced
· Good gap fill
· Excellent impact resistance and flexibility
· Excellent peel and shear strengths
· Substrate versatility
· Medium/fast cure
· Tolerant of dirty surfaces
· Can be dispensed from most packages
· Good flexibility at low temperatures
Limitations
· Some odor problems
· Flammable
Urethanes
Advantages
·
Moderately priced
·
Excellent toughness and flexibility
·
Good flexibility at low temperatures
·
Excellent adhesives for a wide range of
materials
·
One-two component, room- or heatcure
available
·
Varying cure times
Limitations
·
Poor temperature resistance
·
Sensitive to moisture both in cured and
uncured state
·
May undergo reversal with heat and
moisture
·
Two component mixing or single
component toxicity
·
Short pot life
·
Require special equipment to mix and
dispense
·
Epoxies – Epoxies lack solvating ability, as a result they generally perform poorly onthermoplastics and require careful cleaning or surface preparation on metals and
composites. Epoxies can exhibit very high strength but are limited in impact,
particularly at low temperature.
·
Urethanes – Urethanes can have good adhesion to metals and composites but, likeepoxies, have some weakness in thermoplastic bonding and often require primers to
bond. The structure of urethanes can give them excellent performance at low
temperatures, but they weaken quickly at high temperatures.
* From Plexus Bondline newsletter March 2006
