The melting point of polyester is
If you are in those conditions you've got other problems,
Poly blends very well with other fibers to allow controlled performance and I love how quick it dries and how well it packs down.
A poly/merino blend is my prefered material for warmth.
Poly for base layer and long sleeve riding shirts,
One of those problems would be the complications of melted poly.
I know it’s worse case but burns are horrific as it is why tempt fate?
Both my parents worked extensively in burn wards for many many years, I’ve heard enough stories to make me realize it’s something to consider.
Here’s the conclusion to Federal study:
“The low melting point of the synthetic materials and
the energy they absorbed as they changed from a solid to
a liquid significantly decreased the energy transferred to
the mannequin. However, based on these tests, synthetic undergarments pose an increased risk of burn injury because of the possibility that they might melt and stick to the skin when firefighters are exposed to high heat. Undergarments of 100-percent cotton or 100-percent wool did not ignite, melt, or char. Silk undergarments weren’t readily available (only one source was found during an Internet search). A firefighter wearing the silk undergarment would have a higher predicted thermal injury than a firefighter wearing undergarments made from the other fabrics, probably because the silk fabric was so light. The silk undergarment did not melt, but it did begin to char.
Undergarments made of 50-percent polyester and 50-percent cotton showed no sign of melting.
The predicted burn injury generally relates to the weight and thickness of each undergarment. The heavier and thicker the material, the lower the burn injury predicted during these tests.”
Also, a good friend of mine competed in speed skiing in the 80’s at Velocity Peak in Silverton Co.
The injuries they were seeing with wipeouts and sliders on the ice at over 90 mph were burns with clothing melting.
From the Marine Corps:
“”When exposed to extreme heat and flames, clothing containing some synthetic materials like polyester will melt and can fuse to the skin. This essentially creates a second skin and can lead to horrific, disfiguring burns, said Navy Capt. Lynn E. Welling, the 1st Marine Logistics Group head surgeon.
Whether on foot patrol or conducting a supply convoy while riding in an armored truck, everyone is at risk to such injuries while outside the wire.
“Burns can kill you and they’re horribly disfiguring. If you’re throwing (a melted synthetic material) on top of a burn, basically you have a bad burn with a bunch of plastic melting into your skin and that’s not how you want to go home to your family,” said Welling.””
In my time I’ve known two people who have died from tank burst fires after crashes.
Enough for me to consider it a very real possibility. Five gallons of gas between your legs is no joke.