United Coatings Diathon® DS Roof Coating


Diathon® DS Roof Coating is an elastomeric acrylic coating that provides good weatherability, ultraviolet resistance, and fire retardancy for the protection of polyurethane foam. Diathon® DS Roof Coating is a single package coating system designed for easy application with conventional or airless spray equipment, as well as brush or roller.

Sizes Available:

5 gallon (19 liter) pail
54 gallon (208 liter) drum
250 gallon drum

Colors Available:

White, Lt Tan, Lt Gray, Tan, Gray


  • Diathon® DS Roof Coating was specifically developed for protecting sprayed polyurethane foam insulation from degradation caused by normal weathering, aging and ultraviolet exposure. Diathon® DS Roof Coating is used for protection of sprayed-in-place polyurethane foam on sloped roofs and as a topcoat on existing foam roofs previously coated with compatible coating systems.

Physical Properties

Solids by Weight 72% (±2) [ASTM D2369]
Solids by Volume 60% (±3) [ASTM D5201]
Tensile Strength 265 psi (±20) (1.83 MPa)
[ASTM D2370/D6083]
Elongation 200% (±20)
[ASTM D2370/D6083]
Hardness 60 to 70 Shore A
[ASTM D2240]
Permeance 2.7 US perms at 22 dry mils
(155 ng/Pa.s.m² @ 560 microns)
[ASTM E96]
Fire Resistance UL 790 Class “A” classified system
over spray-applied polyurethane foam
on non-combustible decks;
Class A, B, C maintenance and repair coating
Surface Dry Time
for Foot Traffic
5 hours at 75°F (24°C), 50% RH
White at 16 wet mils (406 microns)
3 hours at 75°F (24°C), 50% RH
Medium Gray at 16 mils wet (406 microns)
*Required times will increase @ higher humidities
Low Temperature
Passes 180° flex over ½” (1.2 cm)
mandrel @ -5°F (-21°C)
[Federal Test Method No. 141a-6221]
Limits for Service
0°F to 200°F
(-18°C to 93°C)
Colors White and Light Gray


All documents are U.S. English unless otherwise noted

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