Polyurethane foam is everywhere—from sofa cushions to insulation, and even in creative molds. But what exactly is polyurethane foam, and is it safe to work with? In this article, we explain what polyurethane foam is made of, how it's used, and whether it's toxic. Whether you're a maker, artist, technician, or hobbyist, understanding the materials you work with is essential for both safety and results.
Polyurethane foam is a flexible or rigid foam created by mixing two components: a polyol (resin) and an isocyanate (hardener), often with a blowing agent. During mixing, a chemical reaction occurs in which the blowing agent forms gas bubbles. This expands the material into foam. After curing, it retains its foam-like structure.
Depending on the composition, polyurethane foam can:
At Siliconesandmore.com we offer high-quality polyurethane foams that are ideal for creative projects, mold making, and technical applications.
View our Flexible Foams (SF 50 and SF 280)
Looking for rigid foam? Our rigid PU foams will be available soon.
The short answer: Polyurethane foam is safe when used correctly , but the liquid components before curing can be dangerous.
Polyurethane foam is created by mixing isocyanate and polyol. Both substances can be irritating to the skin, eyes, and lungs. Incorrect processing can lead to:
We strongly advise against working with liquid PU components during pregnancy or breastfeeding , due to possible harmful effects on the (unborn) child.
Important : Since August 2023, it has been mandatory in the EU to undergo safety training if you work with PU products containing more than 0.1% diisocyanates — this applies to most PU casting and foam systems.
Learn more about the mandatory training
Once cured, polyurethane foam is:
Please note: Not all foams are food safe — do not use near food unless specifically stated.
Are you using PU foam for casting, insulating, or modeling? Follow these safety tips:
✔ Work in a well-ventilated area
✔ Wear gloves, safety glasses and preferably a respirator
✔ Avoid skin contact, especially with the isocyanate component
✔ Store components dry and tightly closed between 6–28°C
✔ Clean tools before curing with suitable cleaning agents
Looking for protection? Check out ourrange of safety products.
Our customers use PU foam for:
PU foam offers versatility and lightweight strength — perfect for both creative and technical applications.
So, is polyurethane foam toxic? Not when used correctly . As long as you follow the safety instructions, polyurethane foam is an extremely useful material for makers, builders, and professionals.
Whether you're filling molds, making props, or casting lightweight sculptures, PU foam delivers speed, accuracy, and strength.
Explore our range of polyurethane foams and find materials trusted by professionals in every industry.
Create. Cast. Build.
High-quality polyurethane foams from Siliconesandmore.com
Safe. Reliable. Professional.
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