ASTM C1728-23 PDF

Overview

ASTM C1728-23, "Standard Specification for Flexible Aerogel Insulation," provides guidelines for classifying and evaluating the performance of flexible aerogel thermal insulation products. This standard is widely used in the thermal insulation industry due to the unique combination of flexibility and high insulating properties provided by aerogel materials. The specification addresses product requirements, performance criteria, and test methods for flexible aerogel insulation across a wide temperature range: from –321°F (–196°C) to 1200°F (649°C). Key considerations such as thickness, density, flexibility, water resistance, and thermal conductivity are detailed for various insulation types and applications.

Key Topics

• Classification and Types Flexible aerogel insulation is categorized into Types I through V, based primarily on maximum use temperature, with further subdivisions by grade and category regarding application and test configuration.

• Performance Requirements The standard sets clear criteria for:

  • Maximum and minimum use temperatures
  • Thermal conductivity at specified mean temperatures
  • Density and thickness tolerances
  • Mechanical properties such as compressive strength and flexibility (in accordance with specified ASTM test methods)
  • Chemical properties such as water absorption, water vapor sorption, and corrosiveness

• Installation Considerations For applications below ambient temperature, the use of vapor retarders or barriers is mandated to prevent moisture ingress, ensuring optimal system performance.

• Testing and Compliance Conformance is verified using recognized ASTM test methods for properties including compressive resistance, fungi resistance, linear shrinkage, and flame spread index.

• Workmanship and Quality Insulation materials covered by this standard must exhibit workmanship with no defects that would adversely affect their installation or service life.

Applications

Flexible aerogel insulation specified under ASTM C1728-23 is extensively used in:

• Industrial and Commercial Piping Efficient thermal insulation for hot and cold service pipes, including cryogenic and high-temperature lines.
• HVAC Systems Reducing energy loss in heating, ventilation, and air conditioning ductwork and equipment.
• Building Envelope and Facade Insulation Enhancing the thermal resistance of walls, roofs, and floors, especially in retrofitting scenarios where space is limited.
• Transportation Used in marine, automotive, and aerospace applications for weight-sensitive, high-performance insulation.
• Process Equipment Applied on reactors, tanks, and vessels where both flexibility and superior R-value are required.

Aerogel insulation is particularly valued for its light weight, flexibility, resistance to moisture uptake, and exceptional thermal performance across extreme temperatures.

Related Standards

ASTM C1728-23 is part of a suite of standards supporting thermal insulation manufacturing and quality control. Related ASTM standards include:

• ASTM C165 – Test Method for Measuring Compressive Properties of Thermal Insulations
• ASTM C167 – Test Methods for Thickness and Density of Blanket or Batt Thermal Insulations
• ASTM C177 – Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties
• ASTM C411 – Test Method for Hot-Surface Performance of High-Temperature Thermal Insulation
• ASTM C518 – Test Method for Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus
• ASTM C1338 – Test Method for Determining Fungi Resistance of Insulation Materials and Facings
• ASTM C1763 – Test Method for Water Absorption by Immersion of Thermal Insulation Materials
• ASTM C795 – Specification for Thermal Insulation for Use in Contact with Austenitic Stainless Steel

Consult these related standards for complementary guidelines on insulation performance, installation practices, and product evaluation.

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