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German Design Award 2021

1 Sep 2020

Although TOSTEM Grandel 2 Type 152 is an industrially manufactured product made entirely of metal, its appearance makes it look as if it has been made from wood using traditional methods. The door with lattice-like structure looks sophisticated but has been designed to be discreet so that it can adapt with subtlety to contemporary architecture. The door has a very high level of heat insulation and thus helps to save energy, which is particularly valuable in regions with large variations in temperature.

Red Dot Award 2019

25 Mar 2019

TOSTEM LW is a window developed to realize a bright and comfortable living for the residents. In addition to high heat insulation performance, it has a design and structure that allows you to feel the maximum connection with the outside by the window. With a frame-in design in which all frames on the top, bottom, left, and right cannot be seen from inside the room even when opened or closed, a design with a built-in lock handle in the vertical frame.

iF Design Award 2019

11 Mar 2019

TOSTEM “LW” window was developed to support home users to realize a bright, pleasant and fulfilling home environment. In addition to high heat insulating performance, LW's design and structure help integrate the inner and outer environment. The window is designed so that all frames These features create a pleasant sense of oneness of the outer and inner space when the are hidden from view from inside when the window is both closed and open.


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)