Frequently Asked Questions
Below you will find the answers to some of our most frequently asked questions
Below you will find the answers to some of our most frequently asked questions
Stone wool is a mineral wool made of volcanic rock. Stone wool consists of 5% solid material in the form of stone fibres. The remaining 95% is made up of pores.
The basic materials for our stone wool are basalt and limestone. These are melted to form lava in an oven with a temperature of 1,500°C. The lava is then poured over a number of fast-rotating discs. Thanks to the centrifugal force, the drops fly off the discs and lengthen to form fibres. The process can be compared with candy floss being made at a fair. The fibres are then compressed to form a sturdy mass, from which the slabs and blocks are then cut.
Our stone wool growing media are designed for Precision Growing in a greenhouse. Precision Growing focuses on ‘root zone management’, or in other words, steering of the root environment. Everything that happens in the stone wool substrate has an impact on the functioning of the root environment and therefore the development of the plant. So, we continually investigate how our products, tools and user advice can respond perfectly to changing circumstances, so that the plant is given the very best care, without wasting resources.
Stone wool is non- toxic, non- ignitable, non- reactive, and non-corrosive as concluded through independent laboratories. The used Grodan material is typically classified as “Non-Hazardous - Solid Waste.” – please confirm with your local regulator.
Added value includes:
• Grodan is constantly expanding its reach in order to have our consumers have better access to recycling across North America and around the globe. Together we can make stone wool one of the most recycled materials in the world.
• Please visit this page for the most up to date recycling vendors available
We are a global leader in the supply of innovative stone wool substrate solutions for the professional horticultural based on Precision Growing principles.