science

Photosensitive anodized aluminum

Photosensitive anodized aluminum is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Photosensitive anodized aluminum rather than just read about it. In short: Photosensitive anodized aluminum, also referred to as photo anodized aluminum or photo metal, utilizes the porous nature of unsealed anodized aluminum to create a sub-surface image. The image can be created either through exposure and development of an anodic layer impregnated with silver compounds (Type 1), much like traditional black and white photography, or through the use of a photomask (Type 2) and chemical et…

Key takeaways

Photosensitive anodized aluminum belongs to science; place it in that map before memorising details.
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Connect Photosensitive anodized aluminum to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Photosensitive anodized aluminum from memory before moving on to harder problems.

Reference excerpt

Photosensitive anodized aluminum, also referred to as photo anodized aluminum or photo metal, utilizes the porous nature of unsealed anodized aluminum to create a sub-surface image. The image can be created either through exposure and development of an anodic layer impregnated with silver compounds (Type 1), much like traditional black and white photography, or through the use of a photomask (Type 2) and chemical etching, color addition, or color subtraction.

Technology Type 1 photosensitive anodized aluminum is anodized aluminum that has been impregnated with a silver compound which, when exposed to a light source, creates an activated latent image. Upon development and fixing a black, silver-based image is formed inside of the metal. Type 1 photosensitive anodized aluminum is then sealed in boiling water similarly to common anodized aluminum. Sealing hydrates the aluminum oxide surface, trapping the image beneath the anodized layer. The combined benefits of UV stability and the high image resolution of silver photography along with the abrasion and corrosion resistance of anodized aluminum are used to advantage in applications where permanent product identification is critical such as equipment nameplates, IUID barcode labels, outdoor signage, safety/warning plates, machine control panels and fine art. Type 2 photosensitive anodized aluminum is typically coated with a photo resist, which may be of either the positive or negative type. Exposure of the photo resist through a negative and its subsequent development creates areas on the plate that are either protected by the resist or exposed to the effects of the dye, bleach, or etchant that are used to create the contrasting mark. Type 2 photosensitive anodized aluminum must be sealed just like Type 1. Common use for Type 2 applications are those where color (other than black) is desired on the finished product. The dyes used to create colored Type 2 plates can vary significantly in their heat and color fastness, so are often limited to indoor or short-term outdoor usage. Note that colored dyes can also be incorporated into Type 1 photosensitive anodized aluminum.

History Type 1 photosensitive anodized aluminum was developed in 1950 by Horizons Research Incorporated and is sold today by Horizons Imaging Systems Group under the Metalphoto® brand name.

Industrial and military specification Photosensitive anodized aluminum was qualified to Federal Specification GG-P-455 in 1965, a document that outlines the performance of Type 1 and Type 2 photosensitive anodized aluminum. Since qualification to GG-P-455, photosensitive anodized aluminum has been specified by many military, government and industrial organizations, including:

In 2012 the Naval Surface Warfare Center (NSWC), Corona Division conducted tests on several IUID materials and found that Metalphoto photosensitive anodized aluminum achieved the highest score on more environmental survivability tests than any other IUID label material evaluated. Type 1 photosensitive anodized aluminum is certified to several military and federal specifications:

MIL-A-8625F, Amendment 1, for photosensitized nameplates (Ref. Section 3.4.2.2) DMS-1674G, Class 1 Types 1,2 and 3 and Class 2 MIL-DTL-15024F Type G and Type H (.012 and thicker) MIL-DTL-19834C (.003", foil) A-A-50271 (superseding Mil-P-514D), Composition A, Class 2 and Composition C MIL-STD-130N

Notable uses Over the years, photosensitive anodized aluminum has been used in several notable applications, including:

UID barcode labels used to track assets owned by the United States Military. Labels and schematics inside of fighter jets including the F22, F-35 Joint Strike Fighter and F-18 Super Hornet. Low-reflection labels on combat night vision goggles. Inventory labels on the International Space Station. Landscape architecture and environmental design installations such as the Norma's Garden at the Gathering Place and the Mariemont School Foundation Donor Display. Modular Synthesizer front panels

References

External links Horizons Imaging Systems Group Metalphoto

Illustrations

Worked examples

Example 1 — a first encounter with Photosensitive anodized aluminum

Start with the simplest possible case. Write down what Photosensitive anodized aluminum claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Photosensitive anodized aluminum before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Photosensitive anodized aluminum ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Photosensitive anodized aluminum

In research: Photosensitive anodized aluminum appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Photosensitive anodized aluminum in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Photosensitive anodized aluminum is common in secondary-school and first-year university syllabi. It links to neighbouring topics Aluminium, so understanding it makes those chapters shorter.
In everyday life: Look for Photosensitive anodized aluminum outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Photosensitive anodized aluminum in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Photosensitive anodized aluminum means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
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Frequently asked questions

What is Photosensitive anodized aluminum in simple terms?

Why does Photosensitive anodized aluminum matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Photosensitive anodized aluminum?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Photosensitive anodized aluminum.