Key Takeaways
- Glass falls into four main categories: safety, energy-efficient, decorative, and specialty.
- Toughened and laminated are the two core safety glass types; each behaves differently when broken and suits different applications.
- Double glazing with low-e coating is the most impactful upgrade for thermal comfort in Australian homes.
- Solar control glass (low SHGC) is essential on north and west-facing glazing in hot climates.
- AS 1288 mandates safety glass in impact-risk locations, near doors, in wet areas, and low-level panels.
- Acoustic laminated glass with asymmetric pane thicknesses provides the best noise reduction for homes near roads or railways.
- Decorative types (reeded, frosted, etched) address privacy and aesthetics without sacrificing light.
Glass is more varied than most people realise. Specify windows for a renovation or talk to a glazing supplier and you’ll hear laminated, toughened, low-e, annealed, insulated, acoustic, fritted and fire-rated, usually without much explanation of what separates them or why one is chosen over another.
This guide sorts the main glass types used across the construction industry into four categories, explains what each does and where it’s used, and gives homeowners, builders and architects enough practical guidance to choose well on residential and commercial projects. Not all 36 types matter equally, so the most important ones get the most attention.
If you’re researching glass types as part of a broader window decision, our guides to double glazed fixed windows and double glazed casement windows explain how glazing specification translates into real-world product choices, useful reading once you know what glass types you’re looking for and want to understand how they’re applied in a complete window system.
The Four Main Categories of Glass
Before getting into individual types, it helps to understand the four broad categories that most glass falls into:
Safety Glass
Safety glass is engineered to reduce the risk of injury if it breaks. This is required by Australian Standard (AS) 1288 and related safety standards in certain applications, near doors, in low-level panels, in wet areas, and in other locations where human impact is a foreseeable risk.
Energy Efficient Glass
Energy efficient glass reduces heat transfer, solar heat gain, or both, improving thermal comfort and energy efficiency, and lowering energy bills.
Decorative Glass
Decorative glass provides privacy, texture, colour, or pattern while still admitting natural light. Largely aesthetic in function.
Specialty Glass
Specialty glass addresses specific technical requirements, acoustic performance, fire resistance, self-cleaning, smart switching, and more.
Many of these performance characteristics ultimately depend on how the glass is assembled into a sealed unit rather than on the glass type alone. This guide to insulated glass units and why they matter explains how different panes, spacers, and gas fills work together to influence thermal and acoustic performance in real-world applications.
Core Glass Types for Residential and Commercial Projects
These are the foundational glass types that underpin most residential and architectural glazing decisions. Understanding them makes every other glass type easier to place.
Float Glass
Float glass is the baseline from which most other types begin. It’s manufactured by floating molten glass on a bed of molten tin, producing flat, optically clear glass with consistent thickness. Standard float glass is what you’d find in a typical single glazed window. By itself, it’s not considered safety glass and breaks into sharp, dangerous shards.
Float glass is the raw material of modern construction, processed, toughened, laminated, coated, or combined to produce the other types discussed below.
Toughened (Tempered) Glass
Toughened glass is float glass that has been heated to very high temperatures and then rapidly cooled. This process creates internal stress that makes the glass approximately four to five times stronger than standard glass, and when it does break, it shatters into small, relatively harmless granules rather than dangerous shards.
It’s required in many safety-critical applications: shower screens and enclosures, glass doors, low-level panels in homes and commercial buildings, and anywhere human impact is foreseeable. Toughened glass cannot be cut or modified after tempering; all sizing and cutouts must occur before tempering.
Laminated Glass
Laminated glass consists of two or more layers of glass bonded together with a plastic interlayer, typically polyvinyl butyral (PVB) or ethylene-vinyl acetate (EVA). If broken, the interlayer holds the glass together, preventing dangerous fragmentation. It doesn’t shatter like toughened glass; instead, it holds in place, which is why laminated glass is used in car windscreens.
In buildings, laminated glass is used for overhead glazing (where falling glass fragments are a risk), acoustic applications (the interlayer absorbs sound energy), bushfire-prone areas, and security applications. Acoustic laminated glass with a thicker or specialised interlayer is one of the most effective ways to reduce noise transmission through windows.
Double Glazing and the Building Envelope
An insulated glass unit, commonly called double glazing, is a factory-sealed assembly of two or more glass panes separated by a spacer bar and cavity, typically filled with air or argon gas. The cavity creates thermal resistance: heat transfers through the unit much more slowly than through a single pane, which improves the thermal efficiency of the whole building envelope.
Standard double glazing uses two identical panes. Better-performing units use different pane thicknesses (which disrupts the resonance frequency that allows sound to pass through), low-e coatings, wider cavities, or warm-edge spacers to lift energy performance further. Triple glazing (three panes, two cavities) is used in very cold climates, but is rarely necessary in most Australian applications.
Low-e Glass and Your Energy Rating
Low-e glass has a thin metallic or metallic oxide coating applied to one surface that reflects infrared radiation (heat) while allowing visible light through. The coating is invisible to the naked eye.
There are two main types: hard-coat low-e (applied during manufacturing, more durable, suitable for single glazed applications) and soft-coat low-e (applied after manufacturing, higher performance, used inside sealed double glazed units where the coating is protected from handling).
Low-e glass significantly reduces both heat loss in winter and solar heat gain in summer when specified with the right coating orientation, delivering energy savings and lower energy costs year round. In Australian homes, low-e glass is particularly valuable on west-facing glazing, and on north-facing glazing in hot climates, where summer heat gain drives cooling costs.
Safety Glass Types for Residential Buildings
Beyond toughened and laminated glass, the safety glass category includes several more specific variants, each suited to different structural or regulatory contexts.
Toughened Laminated Glass
Toughened laminated glass combines both processes: toughened panes bonded with a laminate interlayer. It offers the strength of toughened glass with the fragment retention of laminated glass, and holds its structural integrity even when broken. Used in overhead and ceiling glazing, glass across double height spaces, structural glass elements, and high-security applications.
Wired Glass
Wired glass embeds a wire mesh within the glass during manufacturing. The wire holds broken pieces in place in a fire, maintaining the barrier for a limited time. It was widely used historically as fire-rated glazing, though it’s been largely superseded by more modern fire-rated products. It does not meet current safety glazing standards in impact areas because the glass itself is not toughened.
Toughened Safety Glass
Toughened safety glass is the formal classification for toughened glass that meets specific breakage characteristics under Australian Standard (AS) 2208.
Laminated Safety Glass
Laminated safety glass is the laminated equivalent, classified under the same standard.
Heat Strengthened Glass
Heat strengthened glass is similar to toughened glass but is heated and cooled less aggressively, resulting in glass that’s stronger than standard float glass but not as strong as fully toughened. When broken, it fractures into larger pieces than toughened glass. Used in applications where thermal stress or wind loads are a concern but safety glazing classification is not required.
Curved Safety Glass
Curved safety glass is toughened glass formed into curved shapes before the tempering process. Used in structural glazing, architectural feature elements, and some vehicle applications.
Glass Types for Energy Efficiency
Energy efficient glass types are designed to manage heat and light transmission, reducing the thermal load on Australian homes and lowering the energy required for heating and cooling.
Solar Control Glass
Solar control glass is specifically designed to limit solar heat gain without necessarily reducing visible light transmission. It uses selective coatings or absorbing tints to achieve a low Solar Heat Gain Coefficient (SHGC) while maintaining reasonable light transmission. For west-facing or unshaded glazing in hot Australian climates, solar control glass can significantly reduce cooling costs.
Reflective Glass
Reflective glass has a metallic coating that reflects a significant proportion of solar radiation. It has a mirror-like appearance when viewed from outside in bright light. Used widely in commercial facades and in residential applications where solar control is the primary goal. The reflective appearance can be considered either a design feature or a limitation, depending on context.
Tinted Glass
Tinted glass absorbs solar radiation, reducing both heat and light transmission. Grey, bronze, green, and blue tints are the most common. Absorption means the glass itself heats up, which can cause thermal stress and reradiate heat into the building. Combined with a low-e coating or used in a double glazed unit, tinted glass performs better than as a standalone solution.
Low Iron (Extra Clear) Glass
Low iron (extra clear) glass is standard float glass with reduced iron content, which eliminates the greenish tint visible at the edges of standard glass. It appears significantly clearer and more neutral, which matters in applications where colour accuracy is important, such as large frameless glazing, frameless shower screens, artwork display, and premium modern architecture where unobstructed views and a neutral look are the point. It’s a common choice in contemporary architecture for exactly that reason.
Thermally Broken Glazing
Thermally broken glazing, while technically a frame technology rather than a glass type, is often discussed alongside energy-efficient glass because the frame’s thermal performance affects the window’s overall performance. A thermally broken aluminium frame separates the inner and outer sections with a non-conductive barrier, preventing the frame from acting as a thermal bridge.
Vacuum Glazing
Vacuum glazing is an emerging technology where the cavity between two panes is evacuated to near-vacuum rather than filled with gas. Without gas molecules to conduct heat, the thermal resistance is dramatically improved, with unit dimensions much thinner than those of standard double glazing. Currently expensive and not widely available, but promising for retrofit applications where frame depth is a constraint.
Aerogel Glazing
Aerogel glazing incorporates aerogel, an extremely low-density, highly insulating silica material, within a glazing cavity. Provides exceptional thermal insulation but reduces visible light transmission. Used in very high-performance building applications.
Decorative Glass for Privacy and Natural Light
Decorative glass types serve aesthetic and privacy functions, admitting light while controlling visibility, adding texture, or contributing colour and character to a space.
Frosted Glass
Frosted Glass is standard glass with a frosted surface created by sandblasting, acid etching, or applying a film. It diffuses natural light while obscuring visibility, the level of privacy depends on how close the subject is to the glass and the degree of frosting. It’s widely used in bathrooms, ensuite shower screens, and privacy applications.
Obscure Glass
Obscure glass is a broader category that includes any glass providing visual privacy while admitting light. This includes frosted, patterned, tinted, and sandblasted varieties.
Patterned Glass
Patterned glass is manufactured with a textured surface pattern rolled into one face during production. The pattern obscures visibility and adds a decorative quality while allowing diffused light through. Traditional designs include reeded, hammered, and various geometric patterns. A significant revival in popularity is occurring with reeded and fluted glass in contemporary interior design, giving designers more design flexibility and creative freedom without losing light.
Tinted Glass
Tinted glass in a decorative context refers to glass with colour added during manufacturing, bronze, grey, blue, or green tints can add character to a facade or interior application beyond just solar control.
Coloured Glass
Coloured glass ranges from lightly tinted architectural glass to deeply coloured glass used in feature applications and art glass installations.
Etched Glass
Etched glass uses acid, sandblasting, or mechanical abrasion to create a translucent, matte appearance or decorative pattern. High-quality etched glass can incorporate intricate designs, gradients, or logos.
Sandblasted Glass
Sandblasted glass is etched by directing high-pressure sand or abrasive particles at the surface, producing a matte, frost-like finish. Depth and pattern can be controlled to produce both functional privacy glass and decorative elements.
Mirrored Glass
Mirrored glass has a metallic coating on one face, creating a reflective surface. Silver or chrome is most common. Standard mirrors are typically glass with a silver nitrate backing. Architectural mirrored glass is toughened for safety in some applications.
Leaded Glass
Leaded glass consists of small glass panes held together by lead strips (cames) in traditional leadlight windows. Historically functional (large single panes weren’t available), now predominantly decorative and associated with heritage restoration.
Fused Glass
Fused glass involves melting separate pieces of glass together in a kiln to create decorative panels with complex colour patterns. An art glass technique used in feature windows and architectural elements.
Screen-Printed (Fritted) Glass
Screen-printed (fritted) glass has ceramic frit (pigment fused into the glass surface during tempering) applied in patterns, dots, or solid areas. Used in spandrel panels on commercial buildings, glass balustrades (to reduce bird strike risk), shading elements, and decorative facades. The frit is permanently fused and extremely durable.
Back-Painted Glass
Back-painted glass has paint applied to the reverse face, producing an opaque coloured glass used as splashbacks, feature walls, and cladding panels. The painted surface is protected between the glass and the wall, making it highly durable.
Dichroic Glass
Dichroic glass contains metallic oxide layers that produce different colours when viewed from different angles or under different lighting conditions. Primarily used in art glass and feature applications.
Specialty Glass Types
Specialty glass types address specific technical requirements, acoustic performance, fire containment, security, smart switching, and more, where standard glass types are insufficient.
Acoustic Glass
Acoustic glass is specifically designed and tested for noise reduction. This can be achieved through laminated glass with a thicker or acoustically-optimised interlayer, asymmetric pane thicknesses in a double glazed unit (to disrupt the resonance frequency at which sound passes through), or both. Acoustic performance is measured in decibels of sound reduction (Rw or STC rating). For homes near roads, railways, or airports, acoustic glass specification is one of the most impactful comfort improvements available.
Fire Rated Glass
Fire rated glass maintains its integrity under fire exposure for a specified period, typically 30, 60, or 120 minutes. Modern fire rated glass products include gel-filled units (where an intumescent gel between panes becomes opaque and insulating under heat), ceramic glass, and some laminated glass assemblies. Fire rated glazing is required in compartment walls and fire doors in commercial and multi-residential buildings.
Self-Cleaning Glass
Self-cleaning glass has a photocatalytic titanium dioxide coating on the outer surface. Ultraviolet (UV) light from the sun activates the coating, which breaks down organic dirt deposits; when rain hits the surface, the hydrophilic coating causes water to sheet rather than bead, carrying loosened dirt away. Works best on roof glazing with maximum UV and rain exposure. Reduces cleaning frequency in suitable applications.
Electrochromic (Smart) Glass
Electrochromic (smart) glass can change its light transmission and colour in response to an electrical signal. With voltage applied, the glass switches between clear and tinted. Used in commercial facades, privacy applications, and skylights. High cost, but eliminates the need for blinds or shading devices.
Photochromic Glass
Photochromic glass changes tint in response to UV exposure (similar to photochromic spectacle lenses). Darkens in bright sunlight, clears indoors or in shade. Limited in architectural applications due to temperature sensitivity.
Thermochromic Glass
Thermochromic glass changes tint in response to temperature rather than light. When the glass surface reaches a certain temperature, the coating becomes less transmissive. An emerging technology for passive solar control.
Switchable Privacy Glass (PDLC Glass)
Switchable privacy glass (PDLC glass) uses a polymer-dispersed liquid crystal (PDLC) film between glass layers. In an unpowered state, the film is opaque (milky white). When electricity is applied, the crystals align, and the glass becomes clear, making it useful in meeting rooms, medical facilities, and privacy partitions. Fast switching, but the opaque state appears white rather than clear.
X-ray Shielding Glass
X-ray shielding glass contains lead oxide in the glass composition, providing radiation shielding. Used in medical and industrial settings.
Bullet Resistant and Ballistic Glass
Bullet Resistant and ballistic glass consists of multiple layers of glass and polycarbonate bonded together to absorb and distribute the energy of a projectile and is classified by resistance level. Used in security applications, financial institutions, and high-risk facilities.
Channelled (Profile) Glass
Channelled (profile) glass is U-shaped glass channels manufactured for use in channel glazing systems, where multiple channels are placed side by side to create translucent walls or partitions. Provides an industrial aesthetic with good light diffusion, and appears in a growing number of architectural projects.
Cellular Glass
Cellular glass is a rigid foam-like insulation material made from glass. Used in industrial insulation applications rather than transparent architectural glazing.
Borosilicate Glass
Borosilicate glass has high thermal resistance and chemical durability. Used in laboratory equipment, cookware (like Pyrex), and specialised technical applications. Not typically used in architectural glazing.
Soda Lime Glass
Soda lime glass is the most common glass composition worldwide, used to produce standard float glass. Named for its main ingredients: silica sand, soda ash, and limestone.
Aluminosilicate Glass
Aluminosilicate glass contains aluminium oxide, making it harder and more resistant to scratching than standard soda lime glass. Used in smartphone screens, laboratory equipment, and specialty applications.
Spandrel Glass for Commercial Projects
Spandrel glass is not a glass type per se, but an application, opaque glass panels used to conceal the structural floor slab and services on a curtain wall facade in commercial projects. Typically back-painted or fritted, it keeps the building’s design uniform from the outside where vision panels are not required.
Glass Selection for Australian Homes
Glass selection is a crucial aspect of any window specification, and not every window needs the same level of performance. A few principles guide sensible choices in Australian conditions:
- Safety compliance comes first: AS 1288 specifies where safety glazing is required, near doors, in low-level panels, shower screens, and other impact-risk locations. Using non-safety glass in these areas is non-compliant and genuinely dangerous.
- In hot climates, solar control is critical: North and west-facing glazing without appropriate solar control glass contributes substantially to summer cooling loads. Low-e glass with a low SHGC, or solar control glass, is the appropriate specification in these positions.
- Acoustic glass is worth considering near noise sources: A laminated double glazed unit with asymmetric pane thicknesses and an acoustic interlayer provides the best residential acoustic performance. The improvement in comfort for homes near busy roads is substantial.
- Glazing drives your energy rating: A home’s NatHERS rating uses the U-value and SHGC of each window, so the glass and window type you choose show up directly on the NatHERS certificate. A stronger rating supports compliance, lowers running costs and a home’s carbon footprint, and adds value that prospective buyers increasingly look for.
- In bushfire-prone areas, the applicable Bushfire Attack Level (BAL) rating determines what glazing is required: At BAL-29 and above, toughened glass is required; at higher ratings, metal ember screens are also required. Confirm the specific requirements for your site’s BAL classification.
Choosing Glass for Residential and Commercial Use
For most Australian residential properties, four glass types do the heavy lifting: toughened safety glass where safety standards require it, laminated glass for acoustics and overhead glazing, double glazing for thermal efficiency, and low-e or solar control glass to manage heat gain and loss. Decorative and specialty types enhance privacy, style and functionality on top of those fundamentals.
Start with what each pane needs to do, then choose the type. The right design balances safety, energy performance, light and looks, and lowers a home’s environmental impact over its life. Choosing on appearance alone, or defaulting to the cheapest glass, creates problems that are expensive to fix later.
For residential and commercial projects across Melbourne, APS Double Glazing can provide expert guidance on the right glass for each window and door, from sustainable double glazed units to acoustic and safety glazing.
Frequently Asked Questions (FAQs)
1. What are the main types of glass used in homes?
The most common residential glass types are toughened safety glass (required in many locations by Australian Standard (AS) 1288), laminated glass, standard float glass, double glazed insulating glass units, and low-e coated glass for thermal performance. Frosted or patterned glass is widely used in bathrooms and privacy applications.
2. What is the difference between laminated and tempered glass?
Toughened glass is heat-treated to be stronger and shatter into small granules. Laminated glass has a plastic interlayer that holds broken pieces in place. Toughened breaks into fragments; laminated stays together. Each suits different safety applications, and they can be combined for maximum performance.
3. Which glass is safest?
Both toughened and laminated glass qualify as safety glass under Australian standards, but they behave differently when broken. Laminated glass is considered safer for overhead applications because it retains fragments. Toughened glass is typically used in vertical safety glazing applications. Combined toughened-laminated glass provides the benefits of both.
4. What is low-e glass and is it worth it?
Low-e glass has a thin metallic coating that reduces heat transfer in both directions. It’s particularly valuable in Australian conditions for managing solar heat gain through north and west-facing glazing. In double glazed units, it’s one of the most cost-effective performance upgrades available.
5. What glass is best for privacy in a bathroom?
Frosted, obscured, or patterned glass (such as reeded or hammered) provides privacy while admitting diffused light. The glass must also be toughened safety glass to comply with AS 1288 requirements for wet areas. Frosted laminated glass combines privacy with safe breakage characteristics.
6. Which type of glass reduces heat and UV the most?
Solar control glass with a low SHGC rating combined with a low-e coating provides the best combination of solar heat reduction and UV filtering. This type of glass is particularly relevant in Australian homes on north and west-facing elevations where summer heat gain is a primary comfort and energy issue.