MaTestLab > ASTM Methods > Paints and Coatings > ASTM D6694/D6694M Standard Specification for Liquid-Applied Silicone Coating Used in Spray Polyurethane Foam Roofing Systems
Last updated 19th June 2025
ASTM D6694/D6694M Standard Specification for Liquid-Applied Silicone Coating Used in Spray Polyurethane Foam Roofing Systems
ASTM D6694/D6694M is a standard specification for liquid-applied silicone coatings applied over spray polyurethane foam (SPF) roof systems. The coatings are essential in enhancing weathering resistance, ultraviolet (UV) protection, and long-term durability of SPF-based roofs. The standard requires high-performance properties, such as tensile strength, elongation, permeability, and weather resistance. By establishing minimum performance requirements, ASTM D6694 ensures that the coating will provide an effective protective layer over the foam substrate. The standard is essential for product developers, quality control personnel, and contractors using SPF roof systems to ensure consistent performance under varying climatic conditions.
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ASTM D6694 Introduction
Spray polyurethane foam roofing systems have gained popularity as a roofing solution due to their energy efficiency, ease of installation, and suitability for irregular surfaces. The exposed foam, however, is very vulnerable to UV radiation and environmental moisture. As a topcoat, liquid-applied silicone coatings are applied to protect SPF systems and extend their life. ASTM D6694/D6694M aims to state minimum performance features that such silicone coatings should possess to be reliable in roofing applications. It guarantees consistency among the manufacturers and assures engineers and architects about the quality of materials. The standard also enhances best practices in application and directs the evaluation process, thereby being an integral part of SPF roofing installation and maintenance.
ASTM D6694 Test Method
Tensile Strength and Elongation
Measured using a universal testing machine, the coating is tested after curing for tensile strength ≥ 200 psi and elongation ≥ 150%.
Permeance Test
Conducted using a desiccant method at 23°C and 50% RH; the vapor permeance must be ≤ 25 perms for weather resistance.
Accelerated Weathering
Specimens exposed in QUV chamber for 1000 hours; coating must not crack, peel, or show signs of chalking after exposure.
ASTM D6694 Equipment and Sample Preparation
Specimen Preparation
Liquid silicone is applied to a clean, Teflon-coated mold using a draw-down applicator and cured for 7 days at 25°C and 50% relative humidity (RH).
Specimen Dimensions
For tensile testing, dogbone specimens 6 inches in length, 1 inch neck width, and 0.03-inch thickness.
Test Equipment
Universal testing machine with extensometer for elongation, QUV accelerated weathering tester, and controlled humidity chamber.
ASTM D6694 Results and Interpretation
The test results are analyzed by comparing the properties established with the minimum performance standards specified. Tensile strength and elongation tests measure the mechanical integrity and flexibility of the coating in response to roof expansion and contraction. Low water vapor permeance confirms the moisture barrier property of the coating, preventing water penetration into the foam. Non-chalking, non-cracking, and no discoloration upon weathering exposure confirms the UV stability of the product. Coatings meeting all the requirements specified are compliant and acceptable for long-term SPF roof protection.
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ASTM D6694 Related Articles
The ASTM C1305 evaluates the crack-biscement capacity of the coating system under cyclic movement. ASTM D6083 specifies the performance properties for acrylic roof coatings used on SPF, providing an option for silicone. ASTM D5147 provides methods for evaluating the physical properties of roof membrane and its components, supporting compatibility with coatings.
Materials Commonly Tested with ASTM D6694
Silicon coatings designed with high solid materials, which usually consist of polydimethylsiloxane and strong filler, are most tested under this standard. Some formulations include solvents or adhesion promoters to increase compatibility with SPF substrates.
Applications of ASTM D6694 in Industry
Liquid-applied silicon coatings are widely used in commercial, industrial, and institutional roof systems. Their primary applications include SPF roof, UV security for waterproofing, and extending the existing roof life cycle by acting as a renovation layer. These coatings are especially beneficial due to their flexibility and hydrophobic properties in areas with high solar risk or persistent rainfall.
Safety and Best Practices in ASTM D6694
The standard emphasizes the importance of proper ventilation during application to minimize the inhalation of volatile compounds and recommends the use of personal protective equipment, such as gloves and respiratory protection. It also encourages treatment and compliance with surface preparation guidelines to prevent adhesion failures. Following these best practices ensures the safety of activists and optimal coating performance.
Importance of ASTM D6694
ASTM D6694/D6694M SPF is important to maintain the protective performance of roof systems. This ensures that silicon coatings meet stringent mechanical and environmental resistance criteria, enabling a roof to last for a long time and reducing the cost of maintenance. By providing an average status display baseline, the standard supports innovation in coating technology, thereby protecting the integrity of buildings in various climatic regions.
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You can share your astm d6694 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific astm d6694 test to various testing techniques.
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