That's an excellent and practical question! Yes, a darker colored urban trash bin absolutely gets hotter in the summer, and it can definitely melt or weaken the plastic bags inside. Here’s the simple science behind it: darker colors, like black or dark green, absorb more wavelengths of sunlight and convert that light energy into heat. A light-colored or white bin reflects most of that solar energy.
On a hot, sunny day, the air temperature might be 90°F (32°C), but the surface temperature of a dark bin can easily soar to 150-160°F (65-70°C) or higher. The air trapped inside acts like an oven, often becoming even hotter than the outside surface. Standard polyethylene plastic bags begin to soften and lose integrity around 175°F (80°C). In prolonged, direct sun, the bottom and sides of a bag in contact with the scorching bin plastic can indeed melt, fuse to the bin, or develop holes.
This creates a messy problem—leaking liquids and attracting pests. So, what can you do? If possible, place bins in shaded areas. Some municipalities are opting for lighter-colored bins for this reason. For your home, using a slightly thicker bag can offer more resistance. It’s a perfect example of everyday physics impacting urban living and waste management!