NXT Silicone

Product DescriptionNXT Silicone

A ready-to use, high solids, single component, moisture cure fluid applied silicone coating. Breathable membrane possessing superior weathering and water resistance characteristics.

  • White
  • Light Grey
  • Dark Grey
  • Can be Custom tinted upon request

Product Spec Sheet

50 Year Material Warranty


Material tested complies with all the requirements of ASTM D-6694-01 Standard Specification Liquid-Applied Silicone Coating used in Spray Polyurethane Foam Roofing.


It is not recommended that this product be applied at temperatures below 50° F. (10° C.), or if rain is expected within 1 hours of application. This product may be applied at lower temperatures; however the cure time will be extended.

Product Limitations:

Not recommended for continuous immersion service, for use in cryogenic tank, or cold storage roofing applications without a vapor barrier, or directly over modified Bitumen, asphalt or coal tar built-up roofing systems without a sealer.

Ponding Water:

NXT Silicone high solids Membrane is not affected by ponding water, however: The National Roofing Contractors Association considers ponding water on any roof unacceptable. (See the NRCA Roofing and Waterproofing Manual).

Please Contact Cool Roof Store for any specific questions regarding the application of this product.

Flammability Characteristics:

Nutech Silicon Membrane has Class “A” Non-Combustible and Class “B” Combustible credentials as tested under UL 790 procedures over spray foam and single ply roofing systems. Contact CFS or refer to the UL directory for specific information.

HMIS® Rating:

Health 2, Flammability 1, Reactivity 0, Protection X
0= Minimal 1=Slight 2=Moderate 3=Serious 4=Severe

Typical Physical & Performance Characteristics

Tensile Strength (ASTM D-2370) 331 PSI at 73°F, 432 PSI @0°F
Elongation (ASTM D-2370) 192% at 73°F, 216% @ 0°F
Tear Resistance (ASTM D-624) (Die C), lb f/in 37.5
Viscosity (#5 Spindle, 20 rpm @ 77°F Typical 8,000 to 12,000 cps
Reflectivity (ASTM C-1549) .70 Aged 3 yr
Emissivity (ASTM C-1371) .90 Aged 3yr
SRI Value 110 initial
Permeance US Perms (ASTM E-96) 5.9±
Tensile, set at 100% Elongation Nil
Temperature Stability Range -80°F to 350°F (-37°C to 177°C)
Water Absorption (ASTM D-471) .1 Weight % after two weeks at 75°F (24°C)
Weathering/UV Resistance (ASTM D-6694) No Degradation 5000 hrs
Specific Gravity 1.30 @ 77°F (25°C)
Tack Free Time (Temp. & Humidity Dependent) 1 hour
VOC (ASTM D-3960) < 10 Grams/Liter
Durometer Hardness (ASTM D-2240) 50±5 points
Solids Content by Weight (ASTM D-1644) 96% ±2
Solids Content by Volume (ASTM D-2697) 96% ±2
Maximum Continuous Service Temp. 185°F (85°C)
Flash Point (COC , ASTM D-92) 290°F
Cure Time Minimum 2 hrs @ 100°F & 90% Humidity
Maximum 8 hrs @ 40°F & 20% Humidity
Shelf Life (Unopened Containers)
**When stored between 35°F and 75°F
6 mos

Cool Roof Store

Can your Roof Primer Do This?

  • Block Asphalt Bleed through
  • Seal up bare wood
  • Stop your roof leaks — 100%
  • Waterproof
  • Thick, flexible base coat for silicones
  • Stretches 300%
  • Can be left exposed for 7 years without re-coating

Can be used over:

  • Block Asphalt Bleed through
  • Seal up bare wood
  • Stop your roof leaks — 100% Waterproof

Not Recommended over:

  • Block Asphalt Bleed through
  • Seal up bare wood
  • Stop your roof leaks — 100% Waterproof
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Want to do it yourself?

LeakMaster Roofing purchases all their roof coatings from the Cool Roof Store. Learn how to install your own at one of their seminars.

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