Honestly, the answer depends on the material. If you’re asking about a typical recycled plastic street bench, the maximum safe surface temperature before warping is usually around 150°F (66°C), and that assumes normal use without heavy loads. On a very hot sunny day, dark plastic slats can reach 150–170°F (65–77°C), which is enough to soften the material and cause sagging, twisting, or permanent deformation over time. For metal street benches, warping is rarely the limiting factor: steel and aluminum can easily handle 200–300°F (93–149°C) or more without losing their shape, but the powder coating or paint may fail first, and the surface can get painfully hot. Wood benches sit in between—they won’t melt, but sustained surface temperatures above about 160–180°F (71–82°C) combined with sun exposure and moisture cycling can cause warping, checking, and splitting. So if you need a practical limit, try to keep recycled plastic or wood-composite street benches below roughly 150°F (66°C) surface temperature; metal benches are structurally safe at normal outdoor temperatures even when they feel extremely hot.
What’s the maximum temperature these street benches can handle without warping?
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