"Tempered glass" appears on almost every shower door listing. The label alone tells you very little. What matters is whether the tempering process was independently verified — and what happens to the glass if it ever breaks.
How Tempered Glass Actually Works
Standard glass breaks into long, jagged shards. In a bathroom fall, those shards cause serious lacerations.
Tempered glass is produced by heating a glass panel to approximately 620°C, then rapidly cooling the surfaces while the interior remains hot. This creates a compression layer on both faces and a tension layer through the core. The result: the glass is 4–5 times stronger than standard glass under impact.
More importantly, when tempered glass does break, the stored energy releases uniformly — the panel fractures into small, roughly cubic pieces with blunt edges rather than dangerous shards. A child slipping into a tempered glass panel faces a fundamentally different injury risk than with standard glass.
What SGCC and ANSI Z97.1 Actually Certify
"Tempered" is a manufacturing claim. SGCC certification is independent verification of that claim.
The Safety Glazing Certification Council (SGCC) is a third-party body — not affiliated with any manufacturer — that tests glass products against ANSI Z97.1, the US national standard for safety glazing performance. To earn the certification, panels must pass:
- Impact resistance testing — withstands specified load without fracture
- Fragmentation pattern testing — breakage produces safe, blunt fragments
- Thickness tolerance testing — actual thickness confirmed within specification
A product that carries the SGCC mark has been tested by an independent laboratory.
A product that simply says "tempered" has been tested by no one except the manufacturer.
Every Unikoo frameless shower door — UKS04, UKD01, UKH07, and all custom configurations — carries both SGCC certification and ANSI Z97.1 compliance as a baseline specification. Certification documentation is available on request through the catalog library.
EnduroShield: The Safety Specification That Continues After Installation
Certified glass that stays clean is safer than certified glass that doesn't. Soap scum and mineral deposits reduce visibility through the panel and create slip hazards when they transfer to wet tile floors.
Unikoo's EnduroShield coating — factory-applied to every frameless door as standard — fills the microscopic surface pores that allow soap and minerals to bond to uncoated glass. Water beads and runs off. Residue rinses away rather than accumulating. The panel stays optically clear through daily use without aggressive cleaning chemicals that can themselves degrade sealants and grout over time.
Safe glass. Verified by an independent body. Coated to stay that way.