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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallFor a high-risk museum exhibit, specify polycarbonate or laminated security glazing as part of an engineered display case—not as a loose sheet selected by thickness alone. Polycarbonate generally provides the highest impact resistance, while laminated glass offers glass-like rigidity, a strong vapor barrier and retained fragments after breakage. Acrylic can suit lower- or medium-risk displays, but it is not shatter-resistant. The frame, joints, anchors, locks, alarms, seals and staff access determine whether the finished case actually protects the object.
Start with the threat, not the material name
“Impact-resistant glass” can describe several different goals: slowing a fist or accidental blow, resisting repeated strikes, delaying a tool attack, preventing fragments from falling onto an object, or keeping a panel in its frame after it breaks. Those are different performance requirements. The right specification follows a documented threat assessment covering the object’s value and vulnerability, visitor contact, likely attack, required delay, panel size, environmental-control needs and emergency-removal procedure.
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The American Alliance of Museums (AAM) recommends polycarbonate or laminated glass for high- and extremely-high-risk objects and says the protection level should match the anticipated risk. Its Suggested Practices for Museum Exhibit Case Construction and Alarming Design also treats glazing as one part of a complete case and alarm design. A generic “security” label, a sheet sold for general construction or a nominal thickness does not establish a security rating for your particular panel and frame.
Canadian Conservation Institute (CCI) guidance similarly distinguishes materials rather than treating clear plastics as interchangeable. Polycarbonate has better impact resistance than acrylic. Ordinary and tempered glass remain breakable, while laminated security glazing is designed to hold broken pieces together and remain in its frame when properly retained. The frame, edge bite and attachment must be specified with the glazing.
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Compare the principal glazing options
| Option | Best fit | Advantages | Limitations and specification needs |
|---|---|---|---|
| Polycarbonate | High-impact or high/very-high-risk cases | Higher impact resistance than acrylic; available in clear sheet forms and suitable for engineered security assemblies | Does not provide glass’s vapor barrier; grade, thickness, optical quality, UV behavior, dimensions, supports and tested security performance must be documented |
| Acrylic | Lower- or medium-risk cases where low weight and clear plastic are useful | Lightweight, clear and widely used in display work | AAM says it is not shatter-resistant; CCI notes lower impact resistance than polycarbonate, and conservation guidance identifies greater scratch vulnerability than glass |
| Laminated security glass | Cases needing a glass-based panel, rigidity, vapor resistance and retained fragments | Glass layers and interlayers can keep fragments together; glass is rigid and an effective vapor barrier | Composition controls penetration resistance, transparency, weight and cost; it requires a suitable frame and may involve special ordering and longer lead time |
| Security film | Retrofit of compatible existing glazing | Can make a pane harder to break through without replacing the entire panel | Does not strengthen weak frames, locks or anchors; substrate compatibility, access, product level and competent installation are essential |
Compare every option against the same decision axes: anticipated attack and delay, panel dimensions and deflection, fragment retention, optical clarity and reflection, ultraviolet transmission, vapor barrier and airtightness, scratch and cleaning behavior, edge and frame details, total weight, emergency access, cost and delivery time. A panel that performs well in one category can fail in another.
When polycarbonate is the practical choice
Polycarbonate is the usual starting point when impact resistance is the dominant requirement. CCI identifies it as more impact-resistant than acrylic, and AAM places it alongside laminated glass for high- and extremely-high-risk objects. It can be useful where a large clear panel must tolerate accidental or deliberate blows without producing the same breakage pattern as monolithic glass.
Do not order “polycarbonate” without a complete fabrication schedule. Require the resin or product grade, nominal thickness, clear or coated surface, UV characteristics, allowable dimensions, support spacing, edge treatment, fastener details and any documented impact or security test. Deflection and handling loads increase with panel size; a thin sheet in a flexible frame may offer much less protection than its material name suggests. Large or heavy panels need professional lifting, temporary support and an engineered installation sequence.
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Polycarbonate is not a substitute for environmental design. Unlike glass, it does not itself act as an effective vapor barrier. If the object needs stable relative humidity, the case must use a compatible seal and controlled enclosure design, with the panel and frame details reviewed together.
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When laminated security glass is preferable
Laminated security glazing combines glass layers with an interlayer. If the glass cracks, the interlayer is intended to retain fragments and help keep the panel in its frame. The National Park Service describes systems that may use multiple glass layers, interlayers, or glass/polycarbonate combinations; transparency, resistance and cost depend on the exact composition. Its Exhibit Conservation Guidelines cautions that multilayer glazing can require special ordering and planned lead time.
Glass remains rigid and provides an effective vapor barrier, qualities that can simplify an airtight case and reduce panel flex. That does not make ordinary, tempered or laminated glass unbreakable. The fabricator must specify the security construction, edge support, frame bite, retention method and attachment so a damaged panel cannot simply be lifted or pushed out. Account for the greater weight of glass in hinges, lifting points, anchors and the case base.
Choose laminated glass when glass-like optical behavior, rigidity or vapor resistance is important and the threat assessment supports a tested laminated assembly. Do not infer performance from the word “laminated” alone; a decorative or safety laminate may not provide the penetration delay required for a valuable object.
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Where acrylic fits—and where it does not
Acrylic remains common for clear, lightweight display glazing and can be reasonable for lower- or medium-risk exhibits where the expected event is accidental contact rather than a determined attack. It is not equivalent to polycarbonate for impact protection. AAM explicitly warns that acrylic is not shatter-resistant, and CCI rates its impact resistance below polycarbonate.
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Specify scratch-resistant surfaces only when they are compatible with conservation cleaning methods. Acrylic can scratch more readily than glass, so the maintenance plan should identify approved cloths, cleaning solutions and replacement criteria. If visitor contact or vandalism is credible, move up to polycarbonate or a laminated security system rather than trying to compensate for acrylic with a thicker but otherwise undocumented sheet.
Can security film make existing glass safer?
Security film can be a useful retrofit where an existing case is structurally sound and the glazing can be reached on the correct surface. A suitable film and competent installation can make a pane harder to break through and can help retain the broken sheet. AAM and CCI both describe film as a possible protective measure, subject to the product and substrate.
Film is not a case upgrade by itself. It does not correct a weak frame, inadequate edge bite, loose glazing bead, vulnerable screws, poor base attachment, an ordinary lock or an absent alarm. Confirm that the film is compatible with the existing glass, coatings, sealants and cleaning regime; provide access for bubble-free installation; and obtain documentation for the intended protection level. If the frame can be pried apart, the attacker may bypass the treated pane.
Engineer the whole case around the glazing
Frame, joints and attachments
CCI’s theft-and-vandalism guidance identifies cases as potential weak points and recommends security hardware. Design the shell, corners, joints, base and glazing channel as one load path. Use robust anchors, tamper-resistant screws where appropriate and a frame that cannot be spread or removed from the outside. The panel’s edge retention should be continuous or otherwise justified for the threat, not dependent on a small decorative trim.
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Locks, alarms and surveillance
AAM’s case guidance includes locking and alarming. Select locks that resist the assessed attack, protect hinges and keep access auditable. Connect opening or vibration detection to the site’s alarm response and coordinate it with surveillance and staff procedures. A strong pane cannot compensate for an unlocked access panel or an alarm that is routinely bypassed.
Safe authorized and emergency access
Security must not trap staff or delay authorized emergency removal. NARA’s Technical Guidelines require secure exhibit casework for its holdings and advance approval of new or renovated case designs and materials. Those are NARA loan requirements, not universal law, but they illustrate the design balance: provide controlled access, documented keys or tools, lifting points and a rehearsed removal route without creating an easy visitor-side bypass.
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Chemical compatibility
Glazing, sealants, paints, adhesives, foams, fabrics and fasteners can release chemicals into a closed case. The Library of Congress advises that display-case construction materials be chemically inert and pass the Oddy test or Photographic Activity Test (PAT, ISO 18916), as applicable to the collection. Its Limiting Light Damage guidance also supports controlling ultraviolet exposure. Confirm the lender’s material requirements for the specific object before fabrication, because a security laminate or coating that is structurally suitable may still be chemically inappropriate.
Ultraviolet filtering
CCI reports a recommendation of at least 97% UV filtering from 300 to 380 nanometres under ISO 18902:2007 for framing materials. This figure addresses UV filtering, not impact resistance. Ask the glazing supplier for measured transmission data across the relevant range and verify whether the stated performance applies to the complete laminate, coating or film after installation.
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Airtightness and environmental control
Well-sealed enclosures can improve environmental tolerances and limit dust infiltration, although performance also depends on room conditions. CCI Technical Bulletin 38, Airtightness Measurement of Display Cases and Other Enclosures, explains why seal quality should be treated as a measurable case property. Detail gaskets, corners, cable penetrations, access doors and glazing interfaces; then test the assembled case rather than assuming that a nominal seal is airtight.
Use a documented specification workflow
- Record the risk. Have the curator, conservator, registrar, security lead and case fabricator document object value, fragility, likely impact or attack, visitor behavior, environmental targets and emergency-removal needs.
- Set the protection target. Define the required delay, fragment retention and penetration resistance. Request product and system documentation for polycarbonate, laminated glass or a film retrofit; do not assign a rating from the material name or thickness alone.
- Design the assembly. Confirm panel dimensions, deflection limits, supports, edge treatment, frame, joints, base anchors, access panel, locks, alarms and safe glazing-handling procedures. Have the fabricator or engineer review large and heavy panels.
- Review conservation performance. Check optical quality, reflection, UV transmission, scratch and cleaning behavior, chemical compatibility, case sealing and environmental monitoring locations.
- Obtain approvals and prototype where needed. Confirm lender and institutional requirements, review drawings and materials, and build a representative corner or access-door mock-up if the risk or sealing details are unfamiliar.
- Install and verify. Inspect edge retention, fasteners, locks, alarm circuits, seals and anchor points after installation. Record glazing batch or product data, cleaning instructions, keys and emergency procedures.
- Maintain the protection. Schedule inspections for scratches, crazing, seal shrinkage, loose hardware, alarm faults and changes to surrounding room conditions. Re-test after any panel, lock, seal or display-support alteration.
Specification checklist for procurement
| Question | What the tender or drawing should state |
|---|---|
| What threat is being resisted? | Attack type, required delay, visitor-contact assumptions and any applicable tested system or classification |
| What is the panel? | Material, product grade, thickness, dimensions, optical finish, UV data and documented security performance |
| How is it retained? | Frame material, edge bite, glazing channel, gaskets, beads, fasteners and resistance to removal from the exterior |
| What does the case weigh? | Panel and hardware loads, lifting method, hinges or removable sections, base capacity and anchor design |
| How is the object protected environmentally? | Airtightness target or test, gasket and sealant specification, monitoring provisions and room-condition assumptions |
| How will it be serviced? | Authorized access, emergency removal, key/tool control, cleaning products, inspection intervals and alarm integration |
| What are the delivery constraints? | Special-order status, fabrication and installation lead time, replacement availability and safe transport route |
Common mistakes and corrective actions
- Choosing acrylic because it is clear and inexpensive: use it only when the assessed risk is low or moderate; otherwise compare polycarbonate and laminated security glazing.
- Specifying “10 mm security plastic” as a complete requirement: CCI theft-and-vandalism guidance says to use polycarbonate or acrylic at least 10 mm thick for display cases, but that is guidance—not a universal security rating. Still specify grade, supports, frame and tested system performance.
- Assuming tempered glass cannot be broken: treat ordinary and tempered glass as breakable; use a suitable laminated assembly where fragment retention and penetration delay are required.
- Treating film as a replacement for a secure case: inspect the frame, locks, anchors and alarm path first, and specify competent film installation for the actual substrate.
- Ignoring the edge: a strong center panel can fail if the attacker can pry out a corner. Detail continuous retention, protected fasteners and a frame that carries the load.
- Sealing the case without planning access: provide controlled service and emergency removal procedures, then verify that staff can use them safely.
- Buying on appearance alone: request UV, chemical, optical, scratch, weight, lead-time and security documentation before approving a sample.
Cost, lead time and professional responsibilities
Security glazing can cost more and may require special ordering. NPS notes that multilayer materials can affect transparency and delivery time. Obtain a project-specific quotation covering glazing, machining, frame reinforcement, hardware, alarms, installation, transport and replacement stock; comparing sheet prices alone hides the cost of the engineered assembly.
Construction teams should coordinate early with conservation and security staff. The case fabricator needs final panel sizes, access requirements and hardware loads before ordering. Conservators need material and emissions information before enclosed materials are approved. Security staff need alarm points, response procedures and maintenance access. This coordination prevents a late substitution—such as replacing laminated glass with a lighter plastic or adding film after the frame is built—from undermining the protection target.
Bottom-line selection rule
For high-impact or high-value exhibits, begin with a threat assessment and a complete case design. Select a documented polycarbonate or laminated security-glass system when the risk warrants it; reserve acrylic for lower-risk situations; consider security film only as a compatible, professionally installed retrofit. Then verify the frame, retention, locks, alarms, seals, chemical compatibility, UV control, access and maintenance plan. The safest display is the one in which glazing and case engineering are specified as a single system.
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