Metapor® Reactive Metakaolin Pozzolan

Metapor is a highly reactive metakaolin — a fired clay pozzolan — recovered directly from the Poraver expanded glass production process, carrying trace amounts of fine expanded glass. As a pozzolan, it reacts with hydrated lime to form a partially hydraulic binder: one that cures through a chemical reaction with water rather than relying solely on slow air-carbonation, the way plain lime does.

For natural and lime-based construction, this single property solves one of the most persistent practical problems in the trade — slow set and cure times — while keeping the binder fully mineral and free of Portland cement.

Metapor is used in:

• Hempcrete & Hemp-Lime Binders: Blended with hydrated lime (commonly at a 1:1 ratio) to create a locally-sourced, partially hydraulic binder for hemp-lime walls, floors, and blocks — accelerating set time and promoting faster drying without imported hydraulic lime (NHL).
• Lime Mortars & Renders: Improves flexural and compressive strength, reduces shrinkage, and densifies the binder matrix in lime-based mortars and plasters.
• Foundation & Structural Lime Systems: Enables lime-based mixes to achieve early strength and handle thick applications — such as foundation walls — that plain hydrated lime cannot support on its own.
• Cementitious Tile Adhesives & Mortars: Functions as a reactive filler and hardening additive, improving rheology and reducing swelling-shrinkage behaviour.
• General Pozzolanic Enhancement: Wherever a mineral, glass-industry by-product pozzolan is preferred over imported or synthetic supplementary cementitious materials, to reduce embodied carbon and reliance on Portland cement. envelope.