University of Johannesburg
Overview of innovation

The invention

The invention uses plastic waste and Waste Foundry Sand (WFS) to produce building and construction material with a density of between 1700 and 1750 kg/m3. The plastic is melted and WFS is used to produce a paste for the moulding of building material.

Problem solved

Plastics are vital materials in our daily lives, currently, and have serious negative impacts on our environment. Waste plastic is non-biodegradable and the cost of waste disposal in landfills due to the shortage of space and environmental restrictions are ever-increasing. This invention recycles and reuses plastic waste with Waste Foundry Sand (WFS), to produce building construction material. WFS is currently classified as general waste in South Africa, therefore limiting its application.


The material produced with the invention can be used to make products such as building bricks and roof tiles, and is therefore suitable for use in the building and construction industry.


  • The use of two waste materials, each of which have a severe environmental impact, reduces pollution from plastic waste
  • Provides a use for the Waste Foundry Sand (WFS) otherwise classified as general waste
  • Alleviates the cost of waste disposal in landfills, which are associated with shortage of space and environmental restrictions and other issues

Industries of interest

  • Construction industry
  • Building industry
Type of Intellectual Property protection
Innovation Opportunity Type
Natural Resources
Water supply; sewerage, waste management and remediation activities
Natural Resources
Technology Readiness Level
TRL 5 – Prototype tested in a controlled environment