Custom framing has its own vocabulary. For collectors, artists, galleries, designers, and homeowners, these terms affect how an artwork looks, how it is protected, and how easily it can be reframed later.
This guide explains common framing terms used for works on paper, photographs, textiles, paintings, prints, and objects. It is not a framing-process guide, and it does not suggest that every project requires museum-level materials. It is a practical glossary to help you understand framing language before making decisions.
Why Framing Language Matters
Framing decisions are often described in technical shorthand: mat window, spacer, rabbet depth, UV-filtering glazing, archival backing, reversible hinge, float mount. These terms may sound minor, but they affect presentation, protection, cost, and long-term condition.
A decorative poster does not need the same materials as a valuable drawing, limited-edition print, historical photograph, or fragile textile. Still, understanding the terminology helps you ask better questions and recognize when a framer is discussing appearance, preservation, or budget.
The goal is not to become a framing expert. The goal is to understand what is being proposed.
Basic Frame and Mat Terms
Mat
The flat border, usually made from board, placed around artwork inside a frame. Mats are most often used with works on paper, photographs, prints, and documents. A mat can create visual space around the image and help keep the artwork from touching the glazing. Mat color, width, thickness, and material quality all affect the final result.
Mat Window
The opening cut into the mat board through which the artwork is seen. Its size and placement determine how much of the artwork remains visible. For some works, the mat window covers the paper edges. For others, the full sheet is shown, especially when the edges, margins, or signature are important.
Backing Board
The board that sits behind the artwork or mat package. It provides support and helps stabilize the framed piece. Backing boards vary in quality. For valuable or sensitive works, a framer may recommend acid-free or conservation-grade backing. For decorative projects, simpler backing may be acceptable.
Frame Profile
The shape, depth, and design of the frame moulding. A profile may be narrow, deep, flat, rounded, ornate, minimal, or shadowbox-like. The profile affects both appearance and function. Deeper profiles can accommodate spacers, layered mats, thicker works, or dimensional objects.
Rabbet
The inner ledge or recess of the frame that holds the glazing, mat, artwork, spacers, and backing. Rabbet depth matters because the frame must be deep enough to contain all components safely. If a work needs a deep mat package, spacers, or a shadowbox treatment, the frame must have adequate rabbet depth.
Mounting and Support Terms
Mounting
The method used to secure artwork within the frame. The right method depends on the material, condition, value, and desired presentation. Some mounting methods are designed for preservation and reversibility. Others are permanent and may be appropriate only for decorative or replaceable items.
Hinge
A small attachment, often made from paper or archival tape, used to hold artwork in place. Hinges are commonly used for works on paper. In conservation-minded framing, hinges should hold the artwork securely without restricting natural movement. Paper can expand and contract with changes in humidity, so overly rigid attachment can create waves, stress, or damage.
Dry Mounting
Permanently bonds artwork or a print to a board using heat, pressure, or adhesive film. It can create a very flat presentation, which may suit posters, decorative prints, or replaceable photographs. It is generally not appropriate for valuable, original, rare, or preservation-sensitive works because it is difficult or impossible to reverse without damage.
Float Mounting
A presentation method in which the artwork appears to float above the mat or backing, often with the full paper edge visible. This approach is common when the sheet edges matter, such as deckled paper, handmade paper, signed prints, or works where the full object should remain visible. Float mounting requires careful attachment so the work is supported without being over-secured.
Glazing, Spacers, and Shadowboxes
Glazing
The transparent material placed in front of artwork inside a frame. It may be glass or acrylic. Glazing protects against dust, handling, and some environmental exposure. It also affects clarity, glare, weight, breakage risk, and UV protection.
UV-Filtering Glass
Glazing designed to reduce ultraviolet light exposure. UV protection can help slow fading and material degradation, especially for works on paper, photographs, textiles, and other light-sensitive materials. UV-filtering glass does not make artwork immune to light damage. Direct sunlight, strong artificial light, and long exposure can still cause fading over time.
Acrylic
A lightweight glazing material often used instead of glass. It is less likely to shatter, making it useful for large works, shipping, public spaces, children’s rooms, or earthquake-prone locations. Acrylic can scratch more easily than glass and may carry static, which can be a concern for delicate media such as charcoal, pastel, or loose particles. Specialty acrylic options may reduce glare, static, or UV exposure.
Spacer
A narrow strip placed inside the frame to create distance between the artwork and the glazing. Spacers are often used when there is no mat or when the artwork needs separation from the front surface. This separation matters because artwork should generally not press directly against glass or acrylic. Contact can lead to condensation marks, adhesion, surface damage, or mold in poor conditions.
Shadowbox
A deeper frame used to display objects or artworks with dimensional depth. It may be used for textiles, small sculptures, memorabilia, assemblage works, or pieces that need extra space between the object and glazing. Shadowboxes require careful planning because depth, attachment, object support, and internal spacing all affect safety and appearance.
Archival, Conservation, and Preservation Terms
Archival Materials
Products intended to remain stable and reduce the risk of damage over time. In framing, this may include mat board, backing board, tapes, hinges, and other materials that come near or in contact with the artwork. “Archival” is widely used and not always precise. Ask what specific materials are being used and whether they are acid-free, lignin-free, conservation-grade, or reversible.
Acid-Free
Materials with a neutral or alkaline pH and are less likely to cause yellowing, staining, or embrittlement than acidic materials. Acid-free mats and backing boards are often recommended for works on paper, photographs, documents, and other sensitive materials. For highly valuable or fragile works, acid-free materials may be only one part of a broader conservation-minded approach.
Conservation Framing
Methods and materials intended to protect artwork and reduce long-term risk. It often includes acid-free or conservation-grade boards, UV-filtering glazing, reversible attachment methods, and physical separation between artwork and glazing. This does not mean every artwork must be framed to the highest museum standard. It means the framing approach is chosen with the object’s condition, value, and future preservation in mind.
Preservation Framing
Closely related to conservation framing. The term usually emphasizes long-term protection and careful material choices. Different framers may use “conservation framing” and “preservation framing” in slightly different ways, so ask what the terms mean in the specific proposal.
Reversibility
The ability for a framing method to be undone later without damaging the artwork, or with minimal risk. This is especially important for original works, valuable prints, photographs, historical material, and anything that may need future conservation, reframing, sale, loan, or documentation. A reversible hinge is very different from a permanent adhesive mount. Reversibility gives future owners, conservators, and framers more options.
Terms That Affect Appearance, Protection, and Reversibility
Some framing terms describe appearance. Others describe protection. Many do both.
A mat affects the visual border and can help separate paper from glazing. A spacer may be nearly invisible but can protect the artwork’s surface. UV-filtering glazing changes the protective performance of the frame. A shadowbox can create a more dimensional presentation while allowing needed space. Mounting choices may be hidden, but they can have major long-term consequences.
The most important distinction is between decorative choices and preservation-sensitive choices. Decorative framing focuses mainly on how the finished piece looks in a room. Conservation-minded framing also considers how the artwork will age, whether it can be removed safely, and whether the materials touching it are appropriate.
Neither approach is automatically right or wrong. A replaceable poster, a child’s drawing, a decorative print, and a valuable work on paper do not all need the same level of framing. The method should match the artwork.
Understanding Framing Choices with More Confidence
A good framing conversation should make the terms clear. If a framer recommends a mat, spacer, float mount, acrylic glazing, or archival backing, you should understand what each choice does and why it is being suggested.
For sensitive or valuable works, pay close attention to terms involving attachment, contact, light exposure, and reversibility. These decisions are most likely to affect the artwork later.
For decorative projects, simpler materials may be appropriate. The important point is that the choice should be informed, not accidental.
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