A thin, highly flexible aluminized fiberglass heat shielding material; shields up to 350°F (177°C).
  • Fiberglass cloth with reflective aluminum surface on one side
  • Fire retardant and SAE tested for automotive applications
  • Meets Mil-C-24929A

Material Specification No. 1214

Raw materials are not sold separately, please contact the sales department for any special requirements.


The ALS-5 material is lightweight yet provides exceptional heat shielding in high-temperature conditions.

The ALS-5 material is highly flexible due to being only 0.006” thick, and engineered for smaller diameter components. The aluminized fiberglass cloth is intended for applications that are exposed to continuous temperatures as high as 350°F (177°C), with handling short bursts of temperatures as high as 572°F (300°C). The ALS-5 pairs well with an adhesive, high-temperature zipper, or Kevlar thread closure to provide complete, 360-degree heat shielding or custom components that need partial protection. ALS-5 works perfectly for automotive applications such as under-the-hood wiring because of the high-temperature capabilities, lightweight composition, and meeting the SAE J2302 requirements for Thermal Effectiveness.



Break Strength 100 lbs/min (warp) | 50 lbs/min (fill)
Tear Strength 2.0 lbs/min (warp) | 2.0 lbs/min (fill)
Shelf Life 60 months
Abrasion Resistance Good
Material Thickness 0.006"
Radiant Reflectivity 10 seconds; Mil-C-24929A
Material Weight 5.3 oz/sq-yd; ASTM D5041
Material Flexibility Best
Min Temperature Extreme
Minimum Operating Temperature -58 ° F (-50 ° C )
Max Temperature Moderate
Maximum Operating Temperature 350 ° F (177 ° C )
Flexibility Best

Available Attributes

Material Color Aluminum
Thermal Effectiveness

Specifications subject to change without notice. All statements and technical information contained herein are based on tests we believe to be reliable, but the accuracy or completeness is not guaranteed under all circumstances. Before using Zippertubing® products, the user shall determine suitability for the intended use, and user assumes all responsibility for improper selection. Published attenuation values of Zippertubing® shielding have been verified by laboratory testing of the respective shielding materials. Actual installed attenuation values may differ due to installation techniques and final assembly operation parameters which are beyond the control of Zippertubing®. Actual attenuation values can only be determined by the end user testing the completed assembly. U.S. and International Patents and patents pending. © 2021 The Zippertubing® Company, Chandler, Arizona.