1. Sponge
Sponge is a sound-absorbing material with very good performance. Usually, a large number of sponges are used in recording studios to achieve sound insulation. The sound-absorbing effect of the sponge treated with sound-absorbing grooves on the surface is better. This kind of sponge is often called wave cotton. It’s just that sponges have strong water absorption capabilities and are easy to absorb dust. If used as sound insulation materials for windows, they will easily absorb water on rainy days or when wiped with a wet cloth, causing the iron frames on the windows to rust. However, many people’s windows are now protected from rain. It is raining, so it is still very practical, and you can also consider it when choosing.
2. Polyurethane foam
Polyurethane foam is the main component of styrofoam. Cured polyurethane foam materials can have good sound insulation and sound-absorbing properties, and are anti-corrosion and waterproof. Moreover, better polyurethane materials have flame-retardant designs, making them a good choice for sound insulation materials. )