Picture Framing Glass & Glazing

Glazing is the transparent material placed in front of artwork inside many picture frames. Although it is often simply called picture frame glass, glazing can include several types of glass and acrylic, each offering different levels of clarity, reflection control, UV protection, weight, and durability.

Choosing the appropriate glazing depends on what is being framed, where it will be displayed, the size of the piece, and the level of protection required. For photographs, prints, drawings, documents, works on paper, and other sensitive materials, glazing can be an important part of the complete framing package.

What Is Picture Framing Glazing?

In picture framing, glazing refers to the clear protective material positioned between the artwork and the outside environment.

Standard glass is one type of glazing, but specialized glass and acrylic products are also available. Depending on the product, glazing can provide improved optical clarity, reduced reflections, UV protection, lighter weight, or greater resistance to breakage.

Glazing is selected as part of the custom picture framing process, together with the frame, mounting, matting, backing, and other materials surrounding the artwork.

What Does Picture Framing Glass Protect Against?

Glazing creates a physical barrier in front of the artwork. This can help protect the surface from dust, handling, accidental contact, and other exposure.

Certain glazing products can also filter a significant portion of ultraviolet light. UV protection is particularly important for materials that can fade or deteriorate with prolonged light exposure, including many photographs, prints, textiles, documents, and works on paper.

No glazing can eliminate every environmental risk, however. Light levels, humidity, temperature, mounting materials, and display location can all affect the long-term condition of framed artwork.

Standard Picture Framing Glass

Standard clear glass provides a transparent physical barrier between artwork and the surrounding environment.

It can be appropriate for many decorative framing applications, particularly when specialized UV protection or reflection control is not required.

Standard glass can produce visible reflections from windows, lamps, and other light sources. It also should not be assumed to provide the same level of UV protection as glazing specifically manufactured for conservation or preservation applications.

UV-Protective Glass

UV-protective picture framing glass is designed to filter ultraviolet radiation that can contribute to fading, discoloration, and deterioration.

This type of glazing is often considered for original artwork, photographs, limited editions, documents, textiles, sentimental pieces, and other materials intended to be preserved for the long term.

UV protection is one component of a broader preservation strategy. Friedman’s conservation picture framing also considers the mounting, matting, backing, and other materials used around the artwork.

Anti-Reflective Picture Framing Glass

Reflections can make framed artwork difficult to see, particularly in rooms with windows, overhead lighting, or bright light sources positioned opposite the frame.

Anti-reflective glazing is designed to reduce visible reflections and improve the clarity of the artwork behind it. Higher-performance products can make the glazing considerably less noticeable when viewed from normal angles.

Reflection control and UV protection are separate characteristics. Some specialized glazing products combine both features, while others are designed primarily to address one of them.

Museum Glass

Museum glass is a premium picture framing glazing designed to provide high optical clarity while reducing reflections and offering strong UV protection.

It is often selected when both preservation and viewing quality are priorities. By reducing distracting reflections, museum glass can allow colors, details, and surface characteristics of the artwork to remain more visible.

Museum glass can be particularly useful for original artwork, fine art prints, photographs, documents, limited editions, and other pieces where the quality of the presentation is important.

Acrylic Glazing

Acrylic is a transparent alternative to traditional glass. It is substantially lighter than glass and more resistant to breakage, which can make it useful for certain framing applications.

Large framed pieces may benefit from the reduced weight of acrylic. Its resistance to shattering can also be advantageous for artwork that will be transported, installed in certain public environments, or displayed where breakage is a concern.

Acrylic products are available with different optical and protective characteristics, including options designed for UV protection and reflection reduction.

Glass vs. Acrylic for Picture Framing

Glass and acrylic can both provide effective glazing, but their characteristics differ.

Glass offers a hard surface and excellent clarity, while acrylic provides significant weight savings and greater resistance to breakage. The best choice depends on the dimensions of the frame, the artwork, installation location, transportation requirements, and the specific glazing product being considered.

For large or unusually heavy framing projects, the reduction in weight provided by acrylic can become an important structural consideration.

Should Artwork Touch the Glass?

Many types of artwork should be kept separated from the glazing rather than resting directly against it.

A window mat can provide this separation in traditionally matted framing. When a visible mat is not part of the design, other framing components can be used to establish appropriate clearance.

Friedman’s guide to picture frame spacers explains how spacers can maintain separation between artwork and glazing while remaining largely hidden within the frame.

Does UV Glass Prevent Artwork From Fading?

UV-protective glazing can significantly reduce exposure to ultraviolet radiation, but it cannot make artwork completely immune to fading.

Visible light can also contribute to changes in sensitive materials over time. Heat, humidity, pollutants, and the inherent stability of pigments, inks, papers, and photographic materials can also affect how a piece ages.

Even when UV-protective glazing is used, sensitive artwork should generally be displayed with consideration given to overall light exposure and environmental conditions.

Choosing the Right Picture Framing Glazing

The appropriate glazing depends on factors such as:

• The type and value of the artwork
• Sensitivity to light and UV exposure
• Reflection and viewing conditions
• The dimensions of the finished frame
• Overall frame weight
• Risk of breakage
• The level of preservation required

These considerations help determine whether standard glass, UV-protective glazing, anti-reflective glazing, museum glass, acrylic, or another glazing option is appropriate for the project.

Glazing as Part of the Complete Framing Package

Picture framing glass should not be selected independently from the rest of the frame. The glazing needs to work with the artwork, mounting method, mats or spacers, backing materials, frame depth, and intended display environment.

A decorative piece may have very different glazing requirements from an original work on paper, valuable photograph, historic document, or oversized framed piece.

At Friedman’s Framing in Savannah, glazing is selected according to the individual artwork, viewing conditions, frame construction, and level of protection appropriate for the piece.