A museum display case specification is the document that decides whether your tender produces comparable bids or a pile of quotations you cannot reasonably compare. It also decides whether the vitrines that arrive on site protect the objects, satisfy your conservator and pass acceptance first time. Generic phrases like “museum-grade vitrine” or “archival quality” mean nothing to a bidder and everything to a dispute. The fix is a specification written in measurable terms: tolerances, materials, performance classes and test methods. Below is a working structure you can adapt for archaeological, fine art, costume or natural history galleries, with realistic figures drawn from typical fabrication practice.
Start With the Objects, Not the Cabinet
Every requirement in the document should trace back to a collection item. List each object or object group with maximum dimensions, weight, mounting method and sensitivity. A 2.4 m textile may need a case with a 2.5 m internal height and a base that can be dismantled for a 1.1 m door; a 40 kg bronze needs a deck rated for at least 3× its weight with a documented point-load limit. State whether the case is freestanding, wall-mounted, recessed or built into a plinth, and whether sightlines require 360° viewing or only a front face.
Include the room constraints that bidders cannot discover from drawings: lift dimensions, corridor width, floor loading, door clearances and the delivery route. A case that cannot reach the gallery is not a case. If the museum is in a heritage building with a 900 mm stair turn, say so in the specification and require a modular design that assembles in situ.
Define the Enclosure and Display Deck
Be explicit about the construction method. State whether the case is framed with aluminium profiles, welded steel or a monocoque shell, and require a minimum powder-coat thickness, typically 60–80 microns, in a specified RAL colour. Specify internal surfaces: low-emission powder coat, inert laminates, or solvent-free paint with a declared cure period before objects are introduced.
The display deck carries most of the risk. Specify the panel material, load rating per square metre, adjustable shelf pitch (25 mm or 32 mm is common) and the method for routing cables and mounting hardware without penetrating the sealed volume. Require that all deck penetrations are gasketed, and that no adhesive, sealant or foam is used where it will sit within 50 mm of an object.
Glazing, Sealing and the Microclimate
On museum display case specifications, glazing and climate control attract the most questions from tenderers, so give numbers. A defensible baseline for sensitive mixed collections:
- Glazing: laminated low-iron glass, minimum 6.4 mm for cases up to 1.2 m high, 8.8 mm or greater above that; visible light transmission of at least 91%; UV filtration to block at least 99% below 400 nm.
- Tightness: an air exchange rate of 0.1–0.5 volume changes per day for passively buffered cases, tested after installation.
- Humidity: relative humidity held within ±5% of target for actively controlled cases, with a target usually set between 45% and 55% depending on the material.
- Silica gel: specify the quantity in kilograms per cubic metre of case volume and the conditioning humidity of the gel on installation.
- Sensors: at least one temperature and humidity logger per case, with data export and calibration certificates.
Require a leak test method, not just a target. A common approach is a CO2 concentration decay test or a pressure-decay test, with the pass criterion written into the specification and repeated on site after final assembly.
Lighting, Electrical Safety and Security
Lighting requirements should be stated in lux at the object surface and in annual exposure budgets. As a working guide, light-sensitive works such as watercolours, textiles and manuscripts are often limited to 50 lux and 50,000–150,000 lux-hours per year, while oil paintings, furniture and stone tolerate 150–300 lux. Specify LED sources with a colour rendering index of at least 90, a colour temperature between 3000 K and 4000 K, and dimming that does not shift colour temperature noticeably.
On the electrical side, require CE or UL certification depending on destination, a minimum IP rating for LED drivers, and separation between the lighting circuit and any environmental control circuit. For security, state whether the case needs a lock type (cam lock, tamper-proof screw, keyed-alike suite), an alarm contact or a glass-break sensor, and whether the lid is hinged, lift-off or sliding with a documented service procedure.
Tolerances, Testing and Documentation
Vague dimensions create disputes. Allow ±2 mm on overall external dimensions and ±1 mm on internal display area, and require glazing joints to be gap-free to within 0.5 mm before sealing. Ask bidders to submit shop drawings, material certificates, a fire performance class for all plastics and foams, and a conservation compliance statement covering adhesives and sealants.
Insist on a factory acceptance test before shipment. A practical package includes a dimensional report, a gasket and seal inspection, a lighting and sensor function test, and photographs of each case. Agree in advance who attends, who signs, and what happens if a case fails. On site, require a second airtightness test and a cooling-off period of at least 72 hours before objects are installed.
Evaluation Criteria That Keep Bids Comparable
Close the specification with a priced schedule of requirements so tenderers respond to the same line items rather than inventing their own scope. Weight technical compliance and proven museum experience above headline price, and require at least two reference installations of comparable size and environmental performance. A clear specification also pays back during fabrication — a Guangzhou manufacturer such as Libafang can work from drawings and performance targets without ambiguous clarifications, and fewer change orders keep the programme intact.
When the document is finished, ask a conservator to read it for object risk, a project manager to read it for site logistics, and a fabricator to read it for buildability. Any clause none of them can restate in one sentence should be rewritten.
Need a specimen specification or a budget estimate for a museum, jewellery or watch showcase project? Libafang Showcase Co., Ltd. prepares free design concepts and quotations from your object list and gallery drawings, and can supply draft technical clauses for your tender package.
