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PLURAGARD* 601 SPRAY SYSTEM
FOR RIGID URETHANE FOAMS
WITH UL RATED 25-OR-LESS FLAME-SPREAD
Pluragard 601, a two-component rigid urethane spray system, produces foams
that carry a "25-or-less" flame-spread rating** label by Underwriters’
Laboratories. This UL label means that Pluragard 601-produced foam
exhibited no evidence of continued, progressive combustion and should
be suitable wherever local ordinances call for a 25 flame-spread rated
foam.
To qualify for the Underwriters’ Laboratories label, 1 1/2” and 3” thick
nesses of foam based on the Pluragard 601 system were applied to three
substrate materials... 18 gauge uncoated steel; asbestos-cement board;
untreated, 1" by 4” nominal, tongue and groove Douglas fir lumber. These
substrates were chosen to represent non-combustible, materials;
non-combustible, HOH-conductive materials; and materials.
Foams were tested on the individual substrates in the Underwriters’
Laboratories tunnel furnace. In every instance, the foam-substrate combination
qualified for the Fire Hazard Classification Flame Spread Rating of
25-or-less compared to untreated red oak with a standard rating of 100,
signaling a breakthrough for spray-applied urethane foam insulation.
Throughout the testing it was noted that Pluragard 601-based foams offered
important protection to the substrates from the flame...as well as reg
istering a zero fuel contribution.
Equally important, other physical properties of foam prepared with this
new system compare favorably with those of foams made from conventional
urethane spray systems. Pluragard 601-made foams have (as indicated in the
table on page 3): excellent thermal insulating properties, low moisture
vapor permeability, high strength characteristics, low water absorption,
low friability, good hydrolytic, thermal and dimensional stability. They
are odorless and resistant to chemicals, weather, fungus, mildew, insects
and vermin. They adhere to all clean surfaces, including those that are
vertical or overhead, providing a permanently-based tough, seamless,
monolithic, leak-proof insulating barrier that won’t drip, sag, compact,
crumble or rot. Humid aging tests made at 100% relative humidity show
that very little dimensional change occurs. Conversely, at -20°F. this
foam exhibits negligible shrinkage. Pluragard 601 foam flexes easily with
thermal expansion and contraction and has more than twice the insulating
efficiency of the next best insulator on the commercial market.
* Trademark of Wyandotte Chemicals Corporation
** Flame-spread rating, as used here, refers to measurement obtained according to
the ’Method of Test of Surface Burning Characteristics of Building Materials’
National Fire Protection Association No. 225; Underwriters* Laboratories No. 723;
American Society for Testing and Materials E-84.
U-07R
These data are based on tests and information which we believe to be reliable. Whether or not these data are used is within the sole discretion
and judgment of the customer. Having no control over conditions of use, we make no representation of freedom from liability, including patent
liability, incident to the use of the products referred to, and disclaim any responsibility for damage or injury resulting therefrom.
WYANDOTTE CHEMICALS CORPORATION • INDUSTRIAL CHEMICALS GROUP • WYANDOTTE, MICHIGAN 48192
