Chalk DustRoundtower Chalk Dust is a finely crushed, screened off white powder, widely used as a filler and pigment extender in a variety of traditional and conservation grade applications. With a consistent particle size of approximately 7 microns, a slightly alkaline pH in water, and a loose bulk density of 0. 92 kg L, this high purity chalk is ideal for use in lime based plasters, mortars, paints, and roofing treatments. Fine Particle Size: ~7 microns for

The fine aggregate grading and marble powder content allow a smooth

and a loose bulk density of 0

(roundtowerlime

Compatible with Roundtower Woodlath Render

Moisture Buffering & Condensation Control

high vapour permeability

and conservation-led projects

✅ Pozzolanic Reactivity – Reacts with free lime to create additional cementitious compounds

Ideal for fragile surfaces or areas where scrubbing is not appropriate

Commonly used for:

Carefully selected sands and factory-controlled blending provide good workability

retrofitting a vernacular cottage