So yeah,it looks like its fine to cut foam board with a hot knife but you should use proper safety measures. It wouldn't make sense that you couldn't cut foam board at all with a hot knife because they sell tools all over amazon for cutting foam. I really like how much better it cuts than a regular razor! I don't think I could have had such clean cuts on my P - 38 if I didn't use it. Here is what google AI compiled as far as the safety of cutting foam board with a hot knife
While cutting Adams foam board with a hot knife isn't inherently "toxic," it can produce fumes that are considered harmful if inhaled, so it's important to always work in a well-ventilated area and wear a mask when cutting large amounts of foam with a hot knife; check the specific foam board manufacturer's safety guidelines for the best practices.
Key points to remember:
- Fumes from heated foam:
When a hot knife melts the foam, it releases small particles and fumes that can irritate your respiratory system, especially if not properly ventilated.
- Check the foam type:
Different types of foam may produce different levels of fumes, so always check the manufacturer's instructions for the specific foam board you're using.
- Safety measures:
- Ventilation: Always work in a well-ventilated area, ideally outdoors or with a fan directed away from you.
- Mask: Wear a respirator or dust mask to filter out the particles.