Laminated Glass with Hole Manufacturer | Pre-Drilled Safety Glass for Railings and Facades

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KINGSTAR GLASS

Laminated Glass with Hole | Pre-Drilled Safety Glass for Architectural Hardware Integration from KINGSTAR BUILDING GLASS

KINGSTAR BUILDING GLASS Laminated Glass with Hole is a pre-drilled safety glass product engineered for architectural applications requiring hardware integration through the glass panel. The holes are drilled into each glass ply prior to the lamination process, ensuring clean, precise apertures without compromising the integrity of the PVB or SGP interlayer. When the glass is broken, fragments adhere to the interlayer, maintaining the barrier function even after impact. Available with tempered or

Product Detail

What is Laminated Glass with Hole?

Laminated glass with hole is a safety glass product consisting of two or more glass plies bonded together with a polymer interlayer, with holes drilled through the glass panels to accommodate mounting hardware, brackets, or structural connections. The holes are precisely machined into each glass ply prior to the lamination process. This approach ensures that the holes are clean, accurately positioned, and do not compromise the integrity of the interlayer.

The primary advantage of laminated glass with holes is its post-breakage performance. When broken, glass fragments adhere to the interlayer rather than falling free. In railing and balustrade applications, this means that even after impact, there is not suddenly a hole in the barrier—the hole remains closed by the film to which the glass fragments adhere. This characteristic makes pre-drilled laminated glass the required material for guards and balustrades in most building codes.

Laminated Glass with Hole vs. Drilling Tempered Glass

It is important to distinguish between drilling holes in laminated glass and drilling holes in tempered glass:

Feature	Laminated Glass with Hole	Tempered Glass with Hole
Drilling Timing	Holes drilled in each ply before lamination	Holes drilled before tempering
Post-Breakage Behavior	Fragments adhere to interlayer; barrier remains	Shatters into small fragments; barrier disappears
Hardware Integration	Suitable for structural and point-supported applications	Suitable for non-structural applications
Code Compliance	Required for guards and balustrades	Permitted only with independent top rail
Modification After Production	Not possible (holes must be specified before lamination)	Not possible (holes must be specified before tempering)

Once glass has been tempered or laminated, drilling is not possible. All holes must be specified and machined before the glass enters the tempering or laminating furnace.

Drilling Process and Sequence

The drilling of holes in laminated glass follows a specific sequence to ensure quality and safety:

Each individual glass ply is cut to the required size.
Holes are drilled into each ply using diamond-tipped core drills.
Hole edges are ground and polished to remove sharp edges and micro-cracks.
The glass plies are cleaned and inspected.
The interlayer (PVB, SGP, or EVA) is placed between the plies.
The assembly is laminated under heat and pressure in an autoclave.
The finished laminated glass panel is inspected for hole alignment and quality.

The holes in each ply must be precisely aligned so that they match perfectly after lamination. Any misalignment between plies can cause stress concentrations and affect the structural performance of the finished panel.

Hole Types

KINGSTAR BUILDING GLASS offers multiple hole types to accommodate different hardware and mounting requirements:

Hole Type	Description	Typical Applications
Straight (Cylindrical) Hole	Uniform diameter through entire thickness	Standard bolted connections, standoff fittings
Countersunk Hole	Wider diameter at surface to recess bolt head	Flush hardware mounting, frameless systems
Counterbored Hole	Stepped hole for bolt head or nut recess	Point-supported glazing, structural connections
Slot Hole	Elongated hole for adjustment	Expansion joints, adjustable hardware

Countersunk holes are commonly used in structural glass applications where hardware must sit flush with the glass surface.

Technical Specifications

Parameter	Specification
Glass Type	Float Glass, Tempered Glass (EN 12150), or Heat-Strengthened Glass
Glass Plies	2 or more plies
Total Thickness	8.38mm, 10.38mm, 10.76mm, 12.76mm, 13.52mm, 17.52mm, 21.52mm, and custom
Interlayer	PVB (0.38mm, 0.76mm, 1.52mm), SGP/Ionoplast, or EVA
Hole Diameter Range	5mm to 70mm (typical; custom diameters available)
Hole Diameter Tolerance (≤20mm)	±1.0mm
Hole Diameter Tolerance (20-70mm)	±2.0mm
Hole Position Tolerance	±0.2mm to ±1.0mm
Minimum Hole Diameter	Equal to glass thickness or 6mm, whichever is greater
Minimum Edge Distance	2 × glass thickness
Minimum Corner Distance	6 × glass thickness
Maximum Panel Size	Up to 3300mm × 6000mm
Edge Finishing	Flat Polished, Pencil Edge, Beveled Edge
Hole Edge Finishing	Ground and Polished
Available Configurations	Laminated, Tempered Laminated, Heat-Strengthened Laminated
Standards Compliance	EN 14449, EN 12150, EN ISO 12543, ASTM C1172, ASTM E2353, CPSC 16 CFR 1201 Cat II, ANSI Z97.1
Certifications	ISO 9001, CE
Lead Time	15 to 25 days after order confirmation and drawing approval
Packaging	Protective film, edge protectors, hole protectors, interleaving paper, seaworthy wooden crates

Standards and Code Compliance

KINGSTAR BUILDING GLASS Laminated Glass with Hole complies with major international building codes and standards:

European Standards:

EN 14449: Laminated glass and laminated safety glass - Product standard
EN 12150: Thermally toughened soda lime silicate safety glass
EN ISO 12543: Laminated glass and laminated safety glass

US Standards:

ASTM C1172: Standard Specification for Laminated Architectural Flat Glass
ASTM E2353: Standard Test Methods for Glass Railing Systems and Components
CPSC 16 CFR 1201 Category II: Safety standard for architectural glazing materials
ANSI Z97.1: Safety glazing materials used in buildings

IBC (International Building Code) Requirements:

Laminated glass must be used in handrails, guardrails, or guards
Laminated safety glass must comply with CPSC 16 CFR 1201 Cat II or ANSI Z97.1 Class A
Glass railings must be tested as an assembly (glass plus hardware) per ASTM E2353

Applications

Frameless Glass Railings and Balustrades:

Balcony railings and terrace guards
Staircase balustrades (internal and external)
Pool fencing and enclosures
Rooftop garden barriers
Commercial building railings

Point-Supported Glazing Systems:

Glass facades and curtain walls
Glass canopies and entrance covers
Glass roofs and skylights
Structural glass walls

Architectural Hardware Integration:

Glass doors with pivot or hinge hardware
Glass partitions with mounting brackets
Display cases and showcases
Glass stair treads with supporting brackets

Commercial and Public Spaces:

Hotel and hospitality railings
Shopping center barriers
Office building entrances and atriums
Sports facility railings
Airport terminal glazing

Why Choose KINGSTAR BUILDING GLASS Laminated Glass with Hole?

Precision drilling: Holes drilled before lamination with tolerances from ±0.2mm to ±1.0mm.
Post-breakage safety: Fragments adhere to interlayer, maintaining barrier function.
Multiple interlayer options: PVB, SGP, and EVA available for different performance requirements.
Hardware-ready: Straight, countersunk, and counterbored hole options available.
Code compliant: Meets EN 14449, EN 12150, ASTM C1172, and IBC requirements.
Complete processing: Cutting, drilling, edge polishing, and laminating under one roof.
Custom configurations: Custom thicknesses, hole patterns, and sizes available.
10 years of industry expertise: With a decade of dedicated experience in laminated glass manufacturing and export, KINGSTAR BUILDING GLASS has delivered pre-drilled laminated 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 precise hole positioning, clean edges, and reliable processing.

Ready to specify pre-drilled laminated glass for your next railing or facade project? Share your requirements and drawings with our technical team for custom laminated glass with hole solutions. We will provide hole layout recommendations, hardware compatibility guidance, compliance documentation, and a competitive quote tailored to your project requirements, backed by a decade of glass manufacturing expertise.

Frequently Asked Questions (FAQ)

Q1: Can holes be drilled in laminated glass after the lamination process is complete?
A: No. All holes must be drilled into each individual glass ply before the lamination process. Once the glass plies are bonded with the interlayer, drilling is not possible without damaging the interlayer and compromising the structural integrity of the panel. This is why all hole specifications, including diameter, position, and type, must be provided before production begins.

Q2: What is the minimum distance between a hole and the edge of the glass?
A: The minimum distance from the edge of the glass to the edge of the hole should be at least 2 times the thickness of the glass. The minimum distance from a corner to the edge of the hole should be at least 6 times the thickness of the glass. For example, for 12.76mm laminated glass (two 6mm plies), the minimum edge distance would be approximately 25mm, and the minimum corner distance would be approximately 76mm. These distances help prevent stress concentrations that could cause breakage.

Q3: What hole diameters are available and what are the tolerances?
A: KINGSTAR BUILDING GLASS offers hole diameters from 5mm to 70mm, with custom diameters available upon request. For holes up to 20mm diameter, the diameter tolerance is ±1.0mm. For holes between 20mm and 70mm, the diameter tolerance is ±2.0mm. Hole position tolerance is typically ±0.2mm to ±1.0mm depending on the application and requirements. The minimum hole diameter should be equal to the glass thickness or 6mm, whichever is greater.

Laminated glass (LG) is a type of safety glass that holds together when shattered. In the event of breaking, it is held in place by a thin polymer interlayer, typically of polyvinyl butyral (PVB), ethylene-vinyl acetate (EVA), lonoplast polymers, cast in place (CIP) liquid resin, or thermoplastic polyurethane (TPU), between its two or more layers of glass.The interlayer, made through heat and pressure, keeps the layers of glass bonded even when broken, and its high strength prevents the glass from breaking up into large sharp pieces. This produces a characteristic 'spider web' cracking pattern when the impact is not enough to completely pierce the glass.

Extremely high safety

The PVB interlayer withstands penetration from impact. Even if the glass cracks, splinters will adhere to the interlayer and not scatter. In comparison with other kinds of glass, laminated glass has much higher strength to resist shock, burglary, burst and bullets.

Energy-saving building materials

PVB interlayer impedes the transmission of solar heat and reduces cooling loads.

Create aesthetic sense to buildings

Laminated glass with a tinted interlayer will beautify the buildings and harmonize their appearances with surrounding views which meet the demand of architects.

Sound control

PVB interlayer is an effective absorber of sound.

Ultraviolet screening

The interlayer filters out ultraviolet rays and prevents the furniture and curtains from fading effects.

Total thickness: 6.38-17.52mm. Max. size：For architecture 96' x 236' (2438mm x 6000mm). PVB Colors

Milky White

French Green

Light Blue

Bronze

Light Grey

Dark Grey

Ocean Blue etc.

PVB Thickness

0.38mm, 0.76mm, 1.14mm, 1.52mm

Laminated glass is used for architecture, glazing, automobile safety, photovoltaic, UV protection, and artistic expression. The most common use of laminated glass is skylight glazing and automobile windshields. In geographical areas requiring hurricane-resistant construction, laminated glass is often used in exterior storefronts, curtain walls, and windows.