Tempered Glass Fermentation Weights for Fermenting in Wide Mouth Mason Jars

These tempered glass fermentation weights are designed to keep vegetables fully submerged during fermentation, helping reduce mold and support consistent results. Made from high-quality tempered soda-lime glass, they are stronger and more resistant to cracking than standard, non-tempered glass weights.

Each weight measures approximately 2.7 inches (68.5 mm) in diameter, 0.73 inches thick, and weighs 6 oz (170 g), providing enough mass to hold produce securely beneath the brine. The smooth, solid design minimizes trapped air and resists chipping or cracking during active ferments.

Unlike mason jars themselves, which are made from non-tempered glass, these weights are heat-treated for added durability. This extra processing helps reduce failures caused by air bubbles or internal stress, a common issue with lower-quality fermentation discs.

Designed specifically for wide mouth mason jars, one weight will typically cover the surface of a properly filled jar. Additional weights can be used if the jar is not filled to the neck or if extra displacement is needed.

Specifications

• Tempered soda-lime glass
• Diameter: approx. 68.5 mm (2.7 in)
• Thickness: approx. 18.5 mm (0.73 in)
• Weight: 6 oz (170 g) each
• Designed for wide mouth mason jars

A durable, long-lasting option for serious home fermentation and repeat use.