plasters9 - Plasters Binding Materials Gypsum plasters...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Plasters Binding Materials Gypsum plasters Calcium Sulphate Most used internally Cement Plasters (OPC) Undercoats Can be used with waterproofers Lime Plasters Traditional Less used now Conservation work Except Class D gypsum 1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Gypsum Plasters Hemi Hydrate Plasters 1. Hemi Hydrate Calcium Sulphate Plaster Class A 1. Retarded Hemi Hydrate Class B Anhydrous Plasters 1. Anhydrous Gypsum Class C 1. Keene’s Plaster Class D Becoming Harder 2
Background image of page 2
Gypsum Plasters Class A : Plaster of Paris Crushed rock heated to 170 0 C ¾ water driven off Sets quickly – patching, stopping, filling Pre-cast sections – Attempts to re-temper – fractures crystals – weak set Class B : – Retarder keratin added to class A – Suitable for general work
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 9

plasters9 - Plasters Binding Materials Gypsum plasters...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online