Extensive Revision to Guide for Coil Coatings Testing Has Future Focus
ASTM D 3794, Standard Guide for Testing Coil Coatings, is being
revised to update past test methods and cover advanced properties
projected to be commonplace in five years, according to David
Cocuzzi, manager of Coil Coatings Technology, Akzo Nobel Coatings,
Inc., Columbus, Ohio.
As chair of Subcommittee D01.53 on Coil Coated Metals within Committee
D-1 on Paint and Related Coatings, Materials and Applications,
Cocuzzi said an added set of ASTM methods measures total solar
reflectance: Its a series of measurements that is not done right
now by most of us in the industry, but will become important as
we formulate coatings that reflect as much heat as possible.
The revised guide will benefit coatings manufacturers, paint makers,
coil coaters, buyers of painted metal coils, steel companies,
and laboratory professionals. It describes:
- Tests for liquid paint;
- Tests for physical properties of hardness and flexibility after
paint is applied and baked to metal;
- Tests of the aesthetic properties of color and specular reflectance
- Tests for total solar reflectance;
- General color measurement requirements and sampling;
- Metal pre-treatment, panel preparation; and
- Exterior durability and accelerated testing.
The document has been revised in its entirety because it is a
compilation of all ASTM test methods used for testing coil coating,
Cocuzzi added. Its an exhaustive listing, so in a sense, if
there is one document that everyone should have regarding coil
coatings, its D 3794. It will point them to all the hundred-plus
ASTM methods that are listed.
While methods developed by the National Coil Coaters Association
are also referenced, the NCCA has decided to utilize ASTM as their
standards-writing body, and will no longer produce or maintain
their own methods, Cocuzzi said.
The proposed revisions are being balloted within ASTM. They were
written by members of Subcommittee D01.53 on Coil Coated Metals
who represent steel companies, pre-treatment suppliers, coatings
suppliers, coil coaters, and metal building manufacturers.
For further technical information, contact David Cocuzzi, Akzo Coatings, Inc., P.O. Box 489, Columbus, OH 43216-0489 (614/298-1832;
fax: 614/421-4360). Committee D-1 meets June 11-14 in Reno, Nev.
For meeting or membership information, contact D-1 Staff Manager
Tim Brooke, ASTM (610/832-9729). //