Premium Aluminium Windows - Tostem One of the key advantages of TOSTEM premium-quality aluminum windows is their durability. They are designed to withstand harsh weather conditions, such as high winds and heavy rainfall, and are resistant to corrosion and rot. This makes them an ideal choice for homes and buildings located in areas with extreme weather conditions. Another advantage of TOSTEM premium-quality aluminum windows is their energy efficiency. They can be designed with thermal breaks and insulating glass, which helps to reduce heat transfer, keeping your home or building cooler in the summer and warmer in the winter. India's-One Stop Solution for All Premium Windows Requirements. Contact us.