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KINGSTAR GLASS

Toughened Glass | High-Strength Safety Glass for Architectural and Industrial Applications from KINGSTAR BUILDING GLASS

KINGSTAR BUILDING GLASS Toughened Glass, also known as tempered glass, is a high-strength safety glass manufactured through a controlled thermal tempering process. Standard annealed glass is heated to approximately 620-700°C and then rapidly cooled using high-pressure air jets. This process creates surface compression and interior tension, resulting in glass that is approximately four to five times stronger than annealed glass of the same thickness. When broken, toughened glass fractures into sm

Product Detail

What is Toughened Glass?

Toughened glass, also referred to as tempered glass, is a type of safety glass that has been processed by controlled thermal or chemical treatments to increase its strength compared with normal glass. The thermal tempering process—the most common method—involves heating annealed glass to approximately 620-700°C and then rapidly cooling it with jets of cold air. This abrupt cooling puts the outer surfaces of the glass into compression while the interior remains in tension. The resulting compressive stress on the surface gives toughened glass its characteristic strength, approximately four to five times that of annealed glass of the same thickness.

When toughened glass breaks, it fractures into small, relatively harmless particles rather than sharp, jagged shards. This safety characteristic makes toughened glass one of the most widely used safety glass products in the building industry.

Manufacturing Process

The thermal tempering process for toughened glass follows a specific sequence:

The glass panel is cut to the required size and all edge work is completed.
The glass is thoroughly washed and inspected.
The glass is heated in a tempering furnace to approximately 620-700°C.
The heated glass is rapidly cooled using high-pressure air jets.
The glass is inspected for quality and optical distortion.

All cutting, drilling, edge grinding, and notching must be completed before the tempering process. Toughened glass cannot be cut, drilled, or machined after heat treatment.

Key Features

High strength: Approximately four to five times stronger than annealed glass of the same thickness.
Safety breakage: Fractures into small, blunt-edged fragments upon impact, reducing injury risk.
Thermal shock resistance: Withstands temperature differences of up to 200°C.
Impact resistance: Enhanced resistance to impact and mechanical stress.
Wind resistance: Suitable for high-rise applications exposed to wind loads.
Versatile processing: Can be further processed into curved glass, laminated glass, and insulating glass units.
Code compliant: Meets EN 12150, ANSI Z97.1, and CPSC 16 CFR 1201 standards.
Wide thickness range: Available from 3mm to 19mm.
Multiple glass options: Clear, low-iron, tinted, frosted, and patterned.

Important Processing Limitations

All cutting, drilling, and edge work must be completed before tempering.
Toughened glass cannot be cut, drilled, or machined after heat treatment.
All specifications—including dimensions, hole positions, and edge finishes—must be provided before production begins.

Technical Specifications

Parameter	Specification
Glass Type	Float Glass, Low-Iron Glass, Tinted Glass
Thickness Range	3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm, 15mm, 19mm
Maximum Size	Up to 3300mm × 6000mm (varies by thickness and manufacturer)
Strength	4-5x annealed glass of same thickness
Thermal Shock Resistance	Up to 200°C temperature difference
Glass Colors	Clear, Ultra-Clear Low-Iron, Grey, Bronze, Green, Blue
Edge Finishing	Flat Polish, Pencil Polish, Beveled Edge, Arrised Edge
Available Configurations	Monolithic Tempered, Curved Tempered, Laminated Tempered, Insulating Glass Units (IGU)
Processing (Before Tempering)	Cutting, Edge Grinding, Drilling, Notching, Beveling, Polishing
Processing (After Tempering)	None (no further fabrication possible)
Standards Compliance	EN 12150-1, ASTM C1048, ANSI Z97.1, CPSC 16 CFR 1201
Safety Classification	EN 12600 (Class 1B1), BS 6206 Class A
Certifications	ISO 9001, CE
Lead Time	10 to 20 days after order confirmation
Packaging	Protective film, edge protectors, interleaving paper, seaworthy wooden crates

Standards and Code Compliance

KINGSTAR BUILDING GLASS Toughened Glass complies with major international building codes and safety standards:

European Standards:

EN 12150-1: Thermally toughened soda lime silicate safety glass
EN 12600: Pendulum test — Impact test method and classification

US Standards:

ASTM C1048: Standard Specification for Heat-Treated Flat Glass
ANSI Z97.1: Safety glazing materials used in buildings
CPSC 16 CFR 1201: Safety standard for architectural glazing materials

IBC Requirements:

Glass used as structural balustrade panels and infill panels in railings shall be constructed of fully tempered or heat-strengthened glass
Fully tempered glass has a maximum allowable stress of 6,000 psi
Safety glazing must comply with ANSI Z97.1 or CPSC 16 CFR 1201

Applications

Architectural and Building Applications:

Facades and curtain walls
Windows and doors
Skylights and glass walkways
High-rise curtain walls
Storefronts and shopfronts

Residential Applications:

Shower enclosures and bathroom screens
Furniture countertops and tabletops
Room partitions and interior dividers
Glass doors and entrance panels

Furniture and Interior Design:

Tabletops and desktops
Shelving and display cases
Cabinet doors and furniture fronts
Decorative panels and feature walls

Commercial and Public Spaces:

Office buildings and corporate headquarters
Hotels and hospitality venues
Retail stores and shopping centers
Healthcare facilities
Sports facilities and gymnasiums

Transportation:

Windows for trains, buses, and cars

Why Choose KINGSTAR BUILDING GLASS Toughened Glass?

Superior strength: Approximately four to five times stronger than annealed glass.
Safety certified: Meets EN 12150, ASTM C1048, ANSI Z97.1, and CPSC 16 CFR 1201 standards.
Safety breakage: Fractures into small, blunt-edged fragments upon impact.
Thermal shock resistance: Withstands temperature differences of up to 200°C.
Versatile applications: Suitable for architectural, residential, commercial, and furniture applications.
Complete processing: Cutting, edge finishing, drilling, and tempering under one roof.
Full thickness range: Available from 3mm to 19mm.
Custom solutions: Custom sizes, colors, and edge finishes available.
10 years of industry expertise: With a decade of dedicated experience in glass manufacturing and export, KINGSTAR BUILDING GLASS has delivered toughened glass solutions to projects across North America, Europe, the Middle East, and Southeast Asia.
Quality assurance: Strict quality control from raw material selection to final packaging, ensuring consistent quality, precise dimensions, and reliable processing.

Ready to specify high-strength toughened glass for your next project? Share your requirements with our technical team for custom toughened glass solutions. We will provide thickness recommendations, safety certification documentation, and a competitive quote tailored to your project requirements, backed by a decade of glass manufacturing expertise.

Frequently Asked Questions (FAQ)

Q1: What is the difference between toughened glass and annealed glass?
A: Toughened glass is approximately four to five times stronger than annealed glass of the same thickness. The tempering process creates compressive stress on the surface and tensile stress in the interior, giving the glass its characteristic strength. When broken, toughened glass fractures into small, blunt-edged fragments rather than sharp shards, significantly reducing the risk of injury. Annealed glass breaks into large, sharp pieces and does not offer the same safety characteristics.

Q2: What safety standards do KINGSTAR BUILDING GLASS toughened glass products comply with?
A: KINGSTAR BUILDING GLASS toughened glass complies with EN 12150-1 (European standard for thermally toughened safety glass), ASTM C1048 (US standard for heat-treated flat glass), ANSI Z97.1 (safety glazing materials used in buildings), and CPSC 16 CFR 1201 (safety standard for architectural glazing materials). The glass also meets EN 12600 (Class 1B1) and BS 6206 Class A safety ratings.

Q3: Can toughened glass be cut or drilled after the tempering process?
A: No. All cutting, drilling, edge grinding, and notching must be completed before the glass undergoes thermal tempering. Toughened glass cannot be cut, drilled, or machined after heat treatment. This is why all specifications—including dimensions, hole positions, and edge finishes—must be provided before production begins.

Tempered or toughened glass is a type of safety glass processed by controlled thermal or chemical treatments to increase its strength compared with normal glass. Tempering puts the outer surfaces into compression and the interior into tension. Such stresses cause the glass, when broken, to shatter into small granular chunks instead of splintering into jagged shards as ordinary annealed glass does. The granular chunks are less likely to cause injury.

No tong marks on the glass as adopts the horizontally tempering process.

5 times harder than ordinary annealed glass.

Once breakage occurs, the glass disintegrates into small cubical fragments which are relatively armless to human body.

It withstands abrupt change of temperature. For example, a piece of 5mm tolerate the temperature variations within the range of 200°C.

Tempered glass should under go heat soak test to improve safety in use.

Thickness: 3-19mm

Size: Min size 300*200mm,Max size 3300*15000mm

Tempered glass is used for its safety and strength in a variety of applications, including passenger vehicle windows, shower doors, aquariums, architectural glass doors and tables, refrigerator trays, mobile phone screen protectors, bulletproof glass components, diving masks, and plates and cookware.