Oddy Testing and Conservation‑Led Display Case Design
What Is Oddy Testing?
Oddy Testing is a conservation science method widely used by museums, galleries, and heritage institutions to determine whether materials are safe for use in enclosed display cases. Developed at the British Museum by conservation scientist Andrew Oddy, the test identifies materials that may release harmful pollutants capable of corroding or degrading sensitive objects over time.
The procedure exposes three metal coupons—silver, copper, and lead—to a material sample in a sealed, heated, and humid environment. After a set period, conservators examine the coupons for signs of corrosion. Results indicate whether a material is suitable, marginal, or unsuitable for use in sealed display environments.
Why Oddy Testing Matters for Display Cases
Display cases function as enclosed micro-environments. While this protects objects from dust, accidental handling, and external pollutants, it also means any harmful gases released by internal materials can accumulate. Without careful material selection, even a well-built case can accelerate deterioration.
- Metals such as silver, bronze, iron, and lead may corrode
- Organic materials including paper, textiles, leather, and wood may degrade
- Acidic or sulphur-based compounds can cause discolouration or embrittlement
Oddy Testing provides evidence-based assurance that materials used in a case will not compromise the long-term preservation of displayed objects.
Materials Commonly Subject to Oddy Testing
For display cases, Oddy Testing is most relevant for components that sit within the enclosed volume. These include:
- Sealants, adhesives, and silicones
- Paints, coatings, and powder finishes
- Gaskets, foams, and rubber elements
- Internal panels, plinth boards, and surface finishes
- Lighting housings, fixings, and wiring insulation
Materials that behave safely in open environments can behave differently when sealed inside a display case.
How Oddy Testing Influences Display Case Design
At Access Displays, Oddy Testing informs design decisions from the earliest project stages. This ensures that conservation performance is engineered into the display case rather than added as a late-stage correction.
1. Material Selection from the Outset
A proven palette of Oddy-tested materials is used during design and specification, reducing risk and avoiding the need for last-minute material substitutions.
2. Reduced Reliance on Reactive Mitigation
Rather than compensating for unsuitable materials with chemical absorbers, the focus is on selecting materials that are intrinsically safe for enclosed environments.
3. Integrated Conservation Engineering
Oddy Test results influence:
- Joint designs and fixing methods
- Seal design and appropriate levels of air-tightness
- Surface finishes and protective coatings
- Internal fittings, mounts, and component choices
This integrated approach supports the long-term preservation of sensitive objects and minimises the risk of chemical reactions inside the display case.
