| Lead in solder and came | Ask whether the panel contains lead came, lead solder, or both. | Traditional stained-glass construction commonly uses lead-based came or solder. ASTM C1036 specifies flat-glass performance characteristics and does not establish a lead-content limit for stained-glass assemblies. | Written material disclosure, close-up photographs of joints and came, and any available X-ray fluorescence screening report. | High | Assume lead may be present unless testing or reliable documentation shows otherwise. Do not use bare hands for prolonged handling during inspection. |
| Lead surface-coating rule | Determine whether the item has painted, coated, or finished surfaces that could release lead. | In the United States, the Consumer Product Safety Commission limit for lead in paint and similar surface coatings on covered products is 0.009% by weight, equal to 90 ppm. This rule does not automatically make every antique decorative panel subject to the same product category. | Applicable jurisdiction, product-use description, coating information, and an independent laboratory report when regulatory compliance is important. | High | Do not treat an “antique” label as proof of compliance. Obtain professional advice for resale, public installation, or use near children. |
| Testing method | Check whether the seller distinguishes screening from laboratory confirmation. | Handheld XRF can provide non-destructive screening for lead on accessible surfaces, but it may not characterize every concealed layer or the exact total lead content of the assembly. Laboratory sampling is more definitive but may be destructive. | Instrument type, test locations, calibration information, date of testing, and a laboratory chain-of-custody record when available. | Medium | Use XRF as a screening tool, not as an unconditional guarantee of whole-panel safety. |
| Glass type under ASTM C1036 | Ask whether the glass is identified as annealed flat glass and whether its quality category is documented. | ASTM C1036 is a specification for flat glass and addresses categories such as glass type, thickness, and quality requirements. A vintage panel may not have been manufactured or documented to the current edition of the standard. | Glass description, manufacturing date if known, thickness measurement, and any statement identifying the applicable ASTM C1036 edition. | Medium | Use ASTM C1036 as a comparison framework, not as proof that an antique panel complies unless supporting records exist. |
| Glass thickness | Request the thickness of representative glass pieces and note whether thickness varies between pieces. | Antique stained-glass panels often contain individually cut pieces with variation. Thickness variation can affect glazing fit, putty, channels, and protective coverings. | Caliper measurements at several accessible locations, photographs showing the measuring process, and a statement of the thinnest and thickest observed pieces. | Medium | Have the installer design the retaining system around actual measurements rather than assuming a uniform modern sheet thickness. |
| Flatness and bowing | Check for visible sagging, rippling, bowing, or distortion across the complete panel. | ASTM C1036 includes flat-glass quality considerations, but a framed antique assembly may be intentionally irregular or may have changed shape because of age, heat, moisture, or weakened joints. | Front-on and side-angle photographs, a straightedge comparison, and measurements of the maximum gap between the panel and a reference plane. | Medium | Reject or professionally restore panels with severe bowing, loose sections, or movement during handling. |
| Cracks, chips, and sharp edges | Inspect every piece, especially corners, perimeter pieces, and areas adjacent to solder joints. | Cracks and edge damage reduce resistance to handling and thermal stress. A repaired crack may remain structurally weaker than undamaged glass. | High-resolution photographs of both sides, a defect map, repair history, and confirmation that no loose shards are present. | High | Require professional assessment before shipping or installation if cracks, sharp exposed edges, or loose glass are visible. |
| Joint and came condition | Look for separated solder joints, stretched lead came, missing cement, corrosion, or movement between pieces. | The metal framework contributes to the panel’s integrity. Deteriorated joints or came can allow glass pieces to shift and may create sharp exposed edges. | Close-up photographs of corners, intersections, perimeter came, and any visible reinforcement bars. | High | Budget for conservation or releading when the panel flexes, rattles, or shows open joints. |
| Protective glazing | Determine whether the panel is supplied with a separate protective glazing layer. | A protective layer can reduce direct contact and weather exposure, but it does not remove lead from the original assembly and must be designed to avoid trapped moisture and thermal stress. | Protective-glazing material, air gap, ventilation details, mounting method, and installation instructions. | Medium | Use a qualified glazier or conservator for exterior or high-traffic installations. |
| Safety glazing and impact exposure | Assess whether the panel will be installed in a door, sidelाइट, low window, shower area, or another impact-prone location. | ASTM C1036 is not a safety-glazing standard. Locations subject to human impact may require safety glazing under applicable building codes, often involving separate safety-glazing standards and marking requirements. | Installation location, local building-code requirements, and confirmation from a qualified glazing professional. | High | Do not install an antique panel directly in a hazardous location without code review and an engineered protective solution. |
| Shipping and packaging | Review the seller’s packing method, insurance, and damage-claim procedure. | Stained glass is vulnerable to vibration, point loading, impact, and frame distortion during transport. Lead-containing fragments or dust may also create a cleanup concern if breakage occurs. | Photos of the completed package, rigid outer crate or box, cushioning plan, declared value, and insured delivery terms. | High | Choose insured shipping with rigid support. Photograph the package before opening and stop handling if breakage or loose dust is found. |
| Final acceptance criteria | Compare the listing with the received item before installation. | Confirm dimensions, condition, disclosed materials, repairs, test documents, and shipping damage. A decorative antique panel is not automatically suitable for structural, exterior, or child-accessible use. | Invoice, condition report, test records, installation limitations, and written return terms. | Essential | Keep all documentation and obtain professional inspection when lead exposure, structural integrity, or building-code compliance is a concern. |