GRISUN Onyx Black Fire Glass 1/2-Inch 10 lb — Tempered Decorative Fire Pit Glass, Heat-Resistant Finish

GRISUN Onyx Black Fire Glass is a 10-pound bag of 1/2-inch tempered glass gems designed to replace lava rock and enhance the look and heat dispersion of gas or electric fire pits and indoor fireplaces.

This onyx-black fire glass blends deep matte tones with a subtle luster that reflects flames without melting or fading. Manufactured to withstand high temperatures and common outdoor conditions, these uniform 1/2-inch pieces create a clean, modern baseline for fire features, fire tables, and decorative installations like aquarium accents. The product is compatible with propane, natural gas, and electric flame sources and is supplied in a convenient 10 lb package sized for small to medium burners.

How will GRISUN Onyx Black fire glass change the look of my fire pit or fireplace?

The dark onyx color provides a refined, contemporary backdrop that makes flames appear brighter and more defined. Because the pieces are uniform 1/2-inch tempered glass, they settle evenly and create a smooth visual plane that complements metal burners and stone surrounds.

• Deep matte-black finish enhances flame contrast and color.
• Uniform size for an even, professional-looking spread.
• Works well over lava rock or directly on compatible burner pans.
• Reflective surfaces add subtle sparkle without overwhelming brightness.

Will this fire glass withstand heat and outdoor exposure without degrading?

Yes — GRISUN fire glass is tempered and engineered for high-heat environments, offering resistance to corrosion, fading, and thermal shock. It retains heat for a short time after the flame is off but does not combust, and the appearance will remain stable over repeated heating cycles.

• Tempered glass resists cracking under typical burner temperatures.
• Fade- and corrosion-resistant for prolonged outdoor use.
• Non-combustible material that won’t melt or emit toxic fumes.
• Easy to maintain — rinse or brush to remove soot or dust.

How much GRISUN Onyx Black fire glass do I need and how should I install it?

A 10 lb bag of 1/2-inch glass is suitable for topping small burners or refreshing sections of medium-sized fire pits. Installation is straightforward: cover the gas log or burner with a thin layer of lava rock if recommended, then spread the glass evenly to the recommended depth for your burner model.

• 10 lb covers small burners or adds a decorative layer to medium pits.
• Recommended to follow your burner manufacturer’s depth guidelines.
• Install over lava rock or directly on approved burner pans per instructions.
• Keep glass away from direct contact with flames if your setup requires spacing.

Is this fire glass safe for indoor fireplaces or aquariums?

GRISUN Onyx Black is safe for indoor gas and electric fireplaces when installed according to appliance instructions. Some users also incorporate tempered glass into aquarium designs as decorative substrate; verify aquarium-safe finishes and rinse glass thoroughly before use.

• Compatible with propane, natural gas, and many electric fireplaces.
• Follow appliance guidelines for indoor installations to ensure ventilation.
• Rinse glass before aquarium use and avoid coated or treated decorative pieces.
• Do not use in solid-fuel wood fires or any application not specified by the appliance maker.

Who is this for? Homeowners and designers who want a modern, low-maintenance finish for gas or electric fire features will appreciate GRISUN Onyx Black fire glass. It's aimed at people upgrading existing fireplaces, styling fire tables, or adding contemporary flair to outdoor patios. DIY installers and professional landscapers alike will value the consistent size, heat resistance, and decorative appeal packed in the convenient 10 lb quantity.