Expanded slate of shale

Experiment

Slate of shale consists mostly of earthenware clay compressed under the weight of sea water and ice glaciers over millions of years. When fired at clay firing temperatures, slate of shale swells up as it turns into a terracotta-like ceramic material.

Material

Ceramic
Minerals and stone

Craft

Ceramics and pottery-making

General Technique

Structural modifying

Specific Technique

High fired slate of shale

Properties & Qualities

Application

Sample making

Qualities

Rigid

Colour

Earth-colour, Grey

Sample Information

Date of creation

November 3, 2022

Dimensions

Shale: 10x10x2cm

Process & Production

Firing sequence for the samples
1. 0 – 300°C – Time: 3 hrs – Hold: 6 hrs
2. 300 – 1100 °C – Time: 4 hrs – Hold: 10 min
3. 1100 – 0 °C – Time: 0 hrs – Hold:0 hrs

Credits

Craft Maker

OsloMet - Oslo Metropolitan University – Department of Product Design

Photographer

OsloMet - Oslo Metropolitan University