What is the difference between a mat and a border in framing—and how does it affect the price of a framed print?

A mat is an acid-free, multi-ply board inserted between the print and glazing to create separation and prevent adhesion, while a border is either the unprinted margin of the paper itself or a decorative frame edge—adding a mat typically increases framing costs by 30–50% over a border-only treatment for the same size.

The functional distinction: protection vs. composition

A mat serves a conservation purpose. According to the Canadian Conservation Institute, mats (or "window mats") are cut from 100% cotton-rag or alpha-cellulose boards, typically 4-ply (1.4–1.6 mm thick) or 8-ply (2.8–3.2 mm), to create a physical barrier between the print and the glazing. This prevents condensation from trapping moisture against the paper—a critical factor for giclée prints on 310 gsm cotton-rag, where pigment inks remain vulnerable to humidity.

A border, by contrast, is purely visual. It may refer to the unprinted deckle edge of a sheet (common in stone lithographs or etching plates) or the inner lip of a frame that exposes a sliver of the print’s substrate. Borders do not interact with the glazing and offer no archival protection. The Fine Art Trade Guild standards specify that a mat’s bevel cut (typically 45°) should extend 3–5 cm beyond the print edge to ensure no contact with the glass or acrylic.

Price comparison: framed vs. unframed at standard sizes

For a 50x70 cm (20x28 in) giclée print on 310 gsm Hahnemühle Photo Rag, unframed costs range from $120–$250, depending on edition size. The same print in a border-only frame (e.g., a thin black aluminium profile with UV-filtering acrylic) adds $180–$300, bringing the total to $300–$550. Introducing a single 4-ply cotton-rag mat (white or neutral grey) increases framing labor and material costs by 30–50%, resulting in a final range of $450–$800.

Larger formats amplify the difference. An 80x100 cm (32x40 in) print unframed may cost $300–$600; border-framed, $500–$900; and matted, $800–$1,400. The mat’s width (standard is 7.5–10 cm for this size) directly correlates with material waste—an 8-ply mat consumes twice the board of a 4-ply, though the visual impact is marginal for most viewers beyond arm’s length.

Matting is not optional for pigment-based prints intended for display under glass. The American Institute for Conservation notes that even UV-protective glazing can trap up to 0.3 g/m² of moisture per 24 hours in humid climates—a mat’s primary role is to absorb and dissipate this.

Material specifications and longevity

Archival mats use cotton-rag or purified wood-pulp boards rated pH-neutral (7.0–8.5) to prevent acid migration. A 4-ply mat in 50x70 cm format weighs ~120 g; an 8-ply, ~240 g. Borders, being part of the print’s substrate, rely on the paper’s inherent stability—e.g., a 310 gsm cotton-rag sheet resists cockling better than a 200 gsm alpha-cellulose, but neither replaces a mat’s structural role.

Glazing choices affect both cost and mat necessity:

Standard glass (2.5 mm): $50–$90 for 50x70 cm; requires a mat to offset the 3–5 mm gap between print and glazing.
UV-filtering acrylic (3 mm, e.g., Optium Museum Acrylic): $120–$200; reduces UV exposure by 99% but still demands a mat for moisture control.
Non-glare glass (2.5 mm with etched surface): $80–$150; diffuses light but increases the risk of condensation, making a mat non-negotiable.

Visual proportions and the two-thirds rule

A mat’s width should relate to the print size, not the frame. For a 30x40 cm (12x16 in) print, a 5 cm mat on all sides expands the total matted dimensions to 40x50 cm—a ratio that adheres to the two-thirds rule for wall display (where the print’s vertical center sits ~145 cm from the floor). A border-only frame on the same print would measure 32x42 cm, disrupting this proportion unless the frame itself is widened to compensate.

The Fine Art Trade Guild recommends mat widths of:

3–5 cm for prints ≤ 50x70 cm
7.5–10 cm for 60x90 cm to 80x100 cm
10–12.5 cm for ≥ 100x120 cm

Borders, when used instead of mats, should mirror these proportions in the frame’s rabbet depth (the inner lip). A 3 cm border on a 50x70 cm print requires a frame with a 3 cm rabbet, limiting options to deeper profiles like a 4 cm flat-faced wood moulding ($200–$350) versus a 2 cm aluminium L-profile ($80–$150).

Giclée vs. digital prints: why mats matter more

The distinction between giclée (pigment-ink on cotton-rag) and digital (dye-sublimation or laser on coated paper) prints informs mat necessity. Giclées on 310 gsm substrates (e.g., Canson Infinity Rag Photographique) require mats to prevent ink transfer; the pigment particles, though stable, can adhere to glazing under pressure. Digital prints on 250 gsm RC paper (e.g., Fujifilm Crystal Archive) use a polyethylene coating that resists moisture, reducing—but not eliminating—the need for a mat.

The Metropolitan Museum of Art’s print conservation guidelines specify that any print with a textured surface (e.g., watercolor papers like Arches Velin) must be matted to prevent abrasion against glazing. Smooth surfaces (e.g., baryta-coated papers) may tolerate border-only framing if the glazing is spaced with silicone bumpers—a solution adding ~$30–$50 to framing costs but saving $80–$120 versus a mat.

Common questions

Does a mat increase the print’s resale value?

Only if it’s archival. A cotton-rag mat in neutral pH preserves the print’s condition, which directly affects secondary-market value. A colored or acidic mat can degrade the paper, reducing value by 20–40%. Documentation of materials (e.g., "4-ply Museum Board") is essential for provenance.

Can I frame a giclée print without a mat if I use UV acrylic?

UV acrylic reduces light damage but does not address moisture. The Canadian Conservation Institute advises that even with 99% UV-blocking glazing, a mat is required to prevent condensation from adhering to pigment inks. Omitting a mat voids most print warranties for humidity-related defects.

What’s the cost difference between a 4-ply and 8-ply mat?

For a 50x70 cm print, a 4-ply cotton-rag mat costs $40–$70; an 8-ply, $80–$140. The thicker mat adds ~$50–$100 to framing labor due to the deeper bevel cut required. Visual impact is minimal beyond 3 meters—8-ply is typically reserved for prints ≥ 80x100 cm.

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