GRISUN Onyx Black Fire Glass 20 lb 1/2 inch — Polished Tempered Pieces for Fire Pit & Fireplace

GRISUN Onyx Black Fire Glass is 20 pounds of half-inch tempered glass pieces that transform gas and electric fire pits or fireplaces into a clean, modern centerpiece.

These polished black glass gems replace logs or lava rock to deliver a contemporary, low-maintenance look for indoor and outdoor flame features. Designed for use with propane, natural gas, and electric burners, the glass is tempered to resist heat, retain color, and eliminate ash and soot. A single 20 lb bag provides enough coverage to hide burners and piping while adding reflective depth to the flames.

How does this fire glass improve the look of my fire pit or fireplace?

The deep onyx finish creates a sleek, reflective bed that intensifies flame color and produces a modern aesthetic without the clutter of logs. Because the pieces are uniform in size and color, they deliver a consistent visual surface that complements masonry, metal, and contemporary outdoor furniture.

• Polished 1/2" pieces for even flame distribution and reflection
• Rich black tone that contrasts with yellow and blue flames
• Conceals burners and piping for a finished appearance
• Works with a variety of fireplace styles and materials

Is the GRISUN Onyx glass safe and durable around high heat?

This tempered fire glass is manufactured to withstand the temperatures produced by gas and electric burners without melting or losing color. It resists corrosion and long-term fading, and because it doesn’t produce ash, soot, or smoke, it keeps maintenance simple and reduces cleanup time.

• Tempered glass resists thermal stress and cracking
• Colorfast finish that won’t fade with repeated heating
• No ash or soot generation—simpler maintenance
• Compatible with propane, natural gas, and electric systems

How much coverage will a 20 lb bag provide and how should I install it?

A 20-pound bag of 1/2" glass covers most standard burner pans and small to medium fire pits when spread in a shallow, even layer. Installation is straightforward: clear the burner area, position any required heat-safe media like lava rock beneath the burner as directed by the manufacturer, then spread the glass to the desired depth to conceal components and shape flame behavior.

• 20 lb typically covers a standard burner pan with a shallow layer
• Spread evenly to hide plumbing and create consistent flame patterns
• Follow burner manufacturer guidance on minimum media depth
• Suitable for both indoor glass fireplaces and outdoor fire tables

What are the practical benefits compared with traditional wood or lava rock?

Fire glass offers a cleaner, more durable alternative to wood and lava rock by eliminating ash, reducing smoke, and maintaining appearance over time. It also creates a modern, upscale look while reducing odor and particulate emissions typical of burning wood, making it easier to enjoy flames with less mess and maintenance.

• No ash or soot—less cleaning after use
• Stable color and finish over many heating cycles
• Reduces odors and visible particulates compared to wood
• Reusable and long-lasting when handled properly

Who is this for: GRISUN Onyx Black Fire Glass is ideal for homeowners, landscapers, and designers who want a contemporary, low-maintenance flame feature. It suits owners of gas or electric fireplaces and fire pits who need enough material to cover burners and create a polished look—perfect for patios, living rooms with glass fireplaces, fire tables, and show installations where visual impact and easy upkeep matter.