The first step in the
coating selection process is to define your finished product requirements.
With a specification, a manufacturer can work with a coating supplier
to get just the right coating formulated for their specific need.
In selecting a thermosetting powder type from a powder coating supplier,
we advise that the following thoughts be kept in focus throughout the
selection process and during negotiation with suppliers.
The key selection factors are:
• Demonstrated film performance
• Demonstrated application characteristics
• Cost performance balance
Testing of performance issues is important. For example, if the product
will be used outdoors, resistance to UV light and outdoor
weatherability should be tested.
The properties of any particular powder will vary even if they are the
same chemistry. Formulators can produce materials to meet specific
needs.
This is a summary of the key properties of each generic type of
thermosetting powder:
Epoxy: Tough
Chemically
resistant
Poor
exterior durability (chalking)
Hybrid: Decorative film performance similar
to
epoxies
Some
UV and overbake advantages
Not
exterior durable
Polyester Urethane: Exterior durable
Thin film powder coating
Polyester TGIC: Exterior durable
Good
edge coverage
Thicker
films are no problem
Acrylic: Excellent weatherability
Excellent appearance
Good-fair impact resistance
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