Thursday, February 26, 2026

Where oh where Wednesday: Geleen

We work in Maastricht, the capital of Limburg, the southernmost province of the Netherlands. We also live in Limburg, the easternmost province of Belgium. Last week we drove through Limburg in Germany as well. But today I would like to tell a little bit about another city of Limburg in the Netherlands. 

Although Maastricht is the capital, the city of Geleen is also quite important. Most of the cities in this province were mining cities. When the mining dried up, other possibilities had to be sought. Just down the road from Maastricht (or “up” the road, heading North), Geleen is in the middle of the chemical industrial “city” of DSM and Chemelot. 

Ever since 1979 this chemical company has been making special fibers in Geleen. Dyneema is considered the world’s strongest fiber. It is 15 times stronger than steel but tight enough to float on water. It is based on polyethylene (technically a UHMWPE = ultra-high-molecular-weight polyethylene. Try saying that 6 times in a row!). Wikipedia tells me that this fiber weighs 0.97 grams per cubic centimeter. I am not quite sure what that is, but it is quite light. 

This fiber is used in competitive cycling, fishing line, repairing ligaments, protective gloves and bulletproof materials. It is used as a replacement for the steel cables which launch gliders, protects ice skaters (like recently during the Winter Olympics and the many Dutch skaters), anchoring Oil platforms in the sea (steel breaks, Dyneema doesn’t) and all sorts of uses in archery or climbing. 

We drive past the chemical towers regularly, but had never realized what kinds of things can be made so close to home. Geleen has in the meantime merged with the city of Sittard nearby to become Sittard-Geleen. 

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