Overview

U-STUCCO™ has been independently tested in accordance with ASTM E136-12, Standard Test Method for Behavior of Materials in a Vertical Tube Furnace at 750 °C (1,382 °F). This standard determines whether building materials are classified as non-combustible under extreme fire exposure.

Test Methodology

Test Standard:

ASTM E136-12

Furnace Temperature:

750 ºC (1,382 ºF)

Specimens Tested:

Three lightweight stucco samples submitted by U-STUCCO™

Measurements Taken:

• Surface Temperature

• Interior Temperature

• Weight Loss Percentage

• Duration of Flaming (if any)

Results

Maximum Furnace Temperature:

1,385–1,387 ºF

Surface Temperatures:

1,380–1,384 ºF

Interior Temperatures:

1,248–1,263 ºF

Weight Loss:

13–16% (well below 50% limit)

Flaming Duration:

18–24 seconds (all ceased within 30 seconds)

Conclusion

According to ASTM E136 pass/fail criteria, the U-STUCCO™ lightweight stucco samples are officially classified as non-combustible:

• Weight loss < 50%

• Surface/interior temperatures did not rise more than 30 ºC (54 ºF) above furnace temperature

• No flaming persisted beyond the initial 30 seconds

What This Means

U-STUCCO™ provides true fireproof performance, meeting the stringent ASTM E136 classification. This certification demonstrates that U-STUCCO™:

• Will not ignite or contribute to flame spread

• Provides superior fire safety compared to conventional stucco and coatings

• Meets requirements for non-combustible construction assemblies in residential, commercial, and industrial projects

• Enhances compliance with fire codes and insurance requirements

Benefits of ASTM E136 Non-Combustibility

• Increased life safety during fire events

• Reduces risk of ignition and fire spread

• Ideal for wildfire-prone regions and high-risk infrastructure

• Supports LEED and green building certifications