The Clear Glass Block is a traditional hollow glass unit at 190x190x90mm, sold six pieces per box, with a fully transparent, undecorated face. Unlike the solid cast glass bricks elsewhere in T21's range, this block is formed from two glass faces fused around a sealed internal air chamber — the defining construction of genuine glass block architecture, and the source of its real thermal and acoustic insulation properties.

Glass block architecture dates back over a century, fell out of favour through the late twentieth century as a dated, utilitarian material, and has returned strongly in interior design since 2024 — repositioned as a deliberate architectural feature rather than a purely functional privacy screen. The sealed air gap inside each block is what genuinely distinguishes this product category from a solid decorative brick: that trapped air layer measurably reduces heat transfer and sound transmission through the block, properties a solid glass unit simply cannot replicate regardless of how thick or well-finished it is.

As the undecorated reference point across the full 12-pattern Clear Glass Blocks range, this product offers the highest light transmission of any pattern in the line — up to roughly 80% for fully clear glass block generally, though the exact figure depends on installation and glazing specifics. Every other pattern in this range (Waver, Frosted, Lineo, and the rest) introduces some surface treatment that reduces this maximum transparency in exchange for privacy, texture, or decorative character.

Hollow glass block, 190x190x90mm, 6 pieces per box. Dispatched from Bengaluru. All India delivery. WhatsApp +91 94484 64040.

What makes a hollow glass block different from a solid glass brick in terms of real performance?

A hollow glass block is formed from two glass faces fused around a sealed air chamber, which genuinely reduces heat transfer and sound transmission through the unit. A solid glass brick has no internal cavity, so it doesn't carry this same insulation benefit — the distinction is a real structural and performance difference, not just a visual one.

How much light does Clear Glass Block actually let through compared to the patterned options in the range?

Clear glass block generally offers the highest light transmission of any pattern — commonly cited around 80% for fully clear glass block, though actual performance depends on installation specifics. Every patterned option in this range (Frosted, Lineo, Opal, and others) trades some of that maximum transparency for added privacy or texture.