Japanese Innovation
in Window Design
in Window Design
GRANTS is TOSTEM's flagship series. Its innovative design results in a larger surface area of glass for panoramic views. This takes the standard of aluminum windows and aluminium doors to another level.
GRANTS’ innovative design results in a larger surface area of glass for panoramic views.
50 years of performance history
Perform exactly as designed
Our unique windows come home-delivered in a box; making transportation, handling, and storage efficiency a guarantee with us
TOSTEM products are tested and certified by all major Global Standards, which ensure superior quality and consistent performance.
ASTM - American Society for Testing and Materials
American Architectural Manufacturers Association (AAMA)
Japanese Industrial Standards (JIS)
SGS System Certification ISO 9001
Thai Industrial Standards Institutes (TISI)
