Frequently Asked Questions
Below you will find the answers to some of our most frequently asked questions
How can we help you?
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
Carl-Kühne-Straße 2, 47638, Straelen
+49 2839 562 9018
Spellewaardsestraat 45a, 5301 JW, Zaltbommel
+31 418 564800
Duffelsesteenweg 135, 2860, St. Katelijne-Waver
+32 15 314941
Woutersweg 10, 2691 PR, 's-Gravenzande
+31 174 44 6100
Tulpenmarkt 4, 1681 PK, Zwaagdijk
+31 228 563 135
624, Rue De Cornay St Cyr En Val, 21410, St Cyr En Val
+33 2 3849 9080
Plaxton Bridge Road, Woodmansey, Beverley, HU17, 0RT
+44 1482 842123
Pilebækvej 7, 4632, BJÆVERSKOV
14, Route Felix Praud, 44450, Saint Jullien de Concelles
+33 2 5171 1050
ul. Grotnicka 4b, 64-140, Włoszakowice
+48 65 537 07 89
biuro@ogrofol.pl
ul. Giełdowa 12H, 52-437, Wrocław
+48 71 334 03 50
wroclaw_hurtownia@hortico.pl
Via di Tetto Dolce 10, 12100, Cuneo (CN)
+39 0171 348114
info@ageon.it
ul. Szczepankowo 97a, 61-306, Poznań
+48 61 879 87 00
biuro@phu-adviser.pl
ul. Giełdowa 12H; 52-437 Wrocław, Vilnius
wroclaw_hurtownia@hortico.pl
Zi De Lanrinou, 29250, Landerneau
+33298253459
92 Rue Joseph Vernet BP346, 13130, Avignon
+33 4 90 14 28 17
Ludwig-Poihs-Strasse 6, 2320, Schwechat
+43 170652020
ul. Niedźwiady 1B, 62-800, Kalisz
+48 603 999 445
kalisz_hurtownia@hortico.pl
Place Hotel De Ville/B.P. 29, 47320, Clairac
+33 5 5379 8458
Novozamocka 3, 946 03, Kolarovo
+421905443515
primera@stonline.sk
77, Avenue Victor Dalbiez, 66000, Perpignan
+33 4 6885 6868
ul. Postępu 6, 02-676, Warszawa
+48 22 375 07 80
infoPL@grodan.com
North America
Grodan (ROXUL Inc.)
8024 Esquesing Line
Milton, ON L9T 6W3
Canada
T +1 80 08 72 24 76 (toll free)
T +1 90 56 36 06 11
F +1 90 56 36 19 01
Benelux
Grodan (ROCKWOOL B.V.)
P.O. Box 1160
6040 KD, Roermond
The Netherlands
T +31 47 53 53 020
Poland
Grodan (ROCKWOOL Polska Sp. z o.o.)
Postępu 6
02-676, Warsaw
Poland
T +48 22 375 07 80
Head Office
Grodan (ROCKWOOL B.V.)
P.O. Box 1160
6040 KD, Roermond
The Netherlands
T +31 47 53 53 535
Grodan (ROXUL Inc.)
8024 Esquesing Line
Milton, ON L9T 6W3
Canada
T +1 80 08 72 24 76 (toll free)
T +1 90 56 36 06 11
F +1 90 56 36 19 01
Grodan (ROCKWOOL B.V.)
P.O. Box 1160
6040 KD Roermond
The Netherlands
T +31 47 53 53 535
We are a global leader in the supply of innovative stone wool substrate solutions for the professional horticultural based on Precision Growing principles.