As EV infrastructure, data centers, and battery storage facilities expand across the country, fire risk teams and facility planners are facing a growing problem: lithium-ion battery fires don’t respond well to conventional suppression methods. Water can react badly with certain battery chemistries, and standard dry chemical agents often can’t fully address thermal runaway. Expanded glass granulate has emerged as a tested, practical material for encapsulating and suppressing these fires.
Why Lithium-Ion Fires Are Different
A lithium-ion battery fire involves thermal runaway — a self-sustaining chain reaction inside individual cells that can reignite even after visible flames are extinguished. That makes simple flame knockdown insufficient; effective suppression generally requires smothering and isolating the heat source long enough to halt the reaction, which is where an inert, non-reactive encapsulation material becomes valuable.
How Expanded Glass Granulate Performs in Fire Suppression
Expanded glass granulate is composed of amorphous silicon dioxide (SiO₂) with a closed-cell structure, giving it high temperature stability and chemical inertness — it does not burn, melt, or react with the battery’s internal chemistry. When applied around or over a burning cell or battery pack, the material smothers the fire and helps isolate the heat, limiting propagation to adjacent cells. Glasphera testing has established encapsulation depths of two to six inches as effective for suppression, giving facility teams a concrete, specifiable benchmark rather than a vague “apply liberally” recommendation.
Where This Application Is Growing
This use case is expanding alongside several converging industries:
- EV charging and storage infrastructure, where battery packs concentrate fire risk in confined spaces
- Data centers, where battery backup systems (UPS) increasingly use lithium-ion chemistries
- Battery storage facilities supporting grid-scale and renewable energy projects
- Industrial and warehouse facilities storing or handling lithium-ion battery products
As these sectors grow, fire codes and insurance requirements are increasingly specifying suppression and containment materials by performance criteria rather than by a single legacy product — opening the door for inert, tested alternatives like expanded glass granulate.
Practical Advantages Beyond Suppression Performance
Because expanded glass granulate is significantly lighter than natural sand or aggregate and is sold by volume, it’s straightforward to stage in bulk at facilities where pre-positioned suppression material is part of an emergency response plan. Its inert, non-reactive chemistry also means it won’t degrade or react with stored materials over time, making it suitable for long-term staging rather than just point-of-use application.
A Material With Multiple Roles
Fire suppression is only one application for this material. The same closed-cell, high-temperature-stable chemistry that makes it effective for battery fire encapsulation also supports its use in refractory systems, UHPC as an internal curing agent, and lightweight structural concrete — making it a versatile addition for facilities that need both a structural lightweight aggregate and a fire risk mitigation material on hand.
Learn More
Full technical properties, grain sizes, and supply logistics for expanded glass granulate are available on our Expanded Glass Granulate product page.
Evaluating fire suppression materials for a battery storage or EV facility? Contact Tech Silica to discuss encapsulation depths, volume needs, and sample requests.