Technology - HS Toughening | TOYO-SASAKI GLASS, JAPAN


HS Toughening Technology

TSG's HS brand has been synonymous with safety and durability for over 40 years. Here are some of the reasons why the HS brand has earned its long time success.

point1HS means safety

HS toughening treatment is applied only to the top portion of the glass. By limiting the treatment area it reduces the chance of abrupt shattering when breakage occurs compared to full surface treated glass.

point2HS means durability and value

HS offers two treatment options: Physical Toughening and Ion Toughening. Both options provide superb durability which means prolonged service life and is perfect for the fast operation cycles at the foodservice industry.

point3Dishwasher Safe

HS glassware is designed to be both commercial and residential dishwasher safe.

point4More than 45 years of excellence

HS made its debut by TSG in 1967 as Japan's first toughened glass drinkware brand. The HS brand has since been appreciated as the industry standard for over 45 years by the Japanese food service and hospitality sector.

Look for the HS labels for safe and durable service glassware offered by TSG

  • HS Platinum
  • HS Gold
  • HS Blue

Physical Toughened Glassware and Ion Toughened Glassware

Physical Toughening and Ion Toughening are the two major toughening methods for glassware. Both methods temper the glass by creating a compressive stress on the glass surface. Here is a comparison on how HS Glass-Edge Toughenings are advantageous over conventional glass tempering methods.

Physical Toughening

TSG does not carry full surface physical toughened glass products

Type of Toughening
HS Glass-Edge
Physical Toughening
Full Surface
Physical Toughening
Method of Toughening The toughening is applied to the glass edge portion only. The toughening is done by heating and rapid cooling to the glass surface creating a compressive stress. This conventional way of physical toughening is applied to the entire surface of the glassware.
Advantages and Disadvantages Durability
The tempered layer (compressive stress layer) is approx. 0.3mm thicker than that of conventional ion toughening, which protects the applied area from scratches for a prolonged period of time.
The entire glassware is protected.

HS Glass-Edge Toughening solves the abrupt-shattering phenomenon that may happen to full surface treated glass. By limiting the toughening to the top portion only, the way of breaking will be more similar to that of a conventional glass.

Full surface toughening increases durability, but the glass may be subjected to abrupt shattering when breakage occurs, causing the broken pieces of glasses to shatter apart.

Ion Toughening

Type of Toughening
HS Glass-Edge
Ion Toughening
Conventional Glass-Edge/
Full Surface Ion Toughening
Method of Toughening Exclusively developed by TSG, HS Glass-Edge Ion Toughening creates a tempered layer (compressive stress layer) that is at least 2 times thicker* than conventional ion toughening methods.
*In-house comparison test
The toughening is done by creating compressive stresses by chemical process.
Advantages and Disadvantages Durability
HS Glass-Edge Ion Toughening adopts innovative techniques exclusively developed by TSG and offers major improvements over traditional rim ion toughening methods. HS Glass-Edge Ion Toughening is ideal for thin glass and for glassware with complex shapes.

The tempered layer (compressive stress layer) is extremely thin.

Traditional ion toughening is also available to thinner glass, but since its tempered layer is thin itself, the toughening will lose its strength dramatically once the glassware is scratched.
Both HS Glass-Edge Ion Toughened glassware and conventional glass-edge/full surface ion toughened glassware break like normal glassware. They will not be subjected to abrupt, violent shattering that might occur to full surface physical toughened glassware.

See Fine Crystal® Ion Strong® for TSG's groundbreaking non-conventional full-surface ion toughening technology for crystal glass.