\nPlating-rack contact point<\/td>\n Whether the contact witness is permitted, where it may occur, and its allowable appearance<\/td>\n Actual witness location relative to the drawing and finished-part presentation<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\nAvoid adding a bare zone only because another product has one. A masking boundary creates another controlled operation, may require extra handling, and can introduce residue or edge variation. If the functional need can be met by changing the component design, separating a part, or selecting a different finish route, compare those choices with the finishing supplier before locking the specification.<\/p>\n
Choose a boundary method with the finisher<\/h3>\n Selective plating masking can be produced through different approaches. Depending on the part and process, a supplier may use a resist lacquer, tape, wax, a fitted plug or cap, a reusable fixture, or a design that separates the plated and unplated parts. These are not interchangeable recipes. The resist must suit the actual solution sequence, geometry, edge requirement, and removal method. A material that works for one plating chemistry may fail in another; the finisher must select and qualify the method.<\/p>\n
Masking can be applied manually or through a repeatable fixture or mask. Manual application may be practical for a low-volume or irregular part, while a shaped mask can help control a repeated boundary. The buyer should not dictate an unverified material or application process unless that process is part of the qualified specification. Instead, define the result, ask the supplier to propose a method, and approve the part or sample that demonstrates it.<\/p>\n
\n
\n\n\nApproach to discuss with the supplier<\/th>\n Potential role<\/th>\n Questions to resolve before approval<\/th>\n<\/tr>\n<\/thead>\n \n\nStop-off lacquer or resist<\/td>\n Protect a defined area through the specified plating sequence<\/td>\n Is the product suitable for every solution and removal step in the actual route?<\/td>\n<\/tr>\n \nTape or film<\/td>\n Cover a boundary that can be sealed consistently<\/td>\n Can the edge prevent solution creep, and will removal leave residue?<\/td>\n<\/tr>\n \nPlug, cap, or fitted mask<\/td>\n Protect a hole, thread, or repeatable geometry<\/td>\n Does the mask fit the real tolerance range and avoid damaging the part?<\/td>\n<\/tr>\n \nDedicated fixture or reusable mask<\/td>\n Repeat a location across multiple parts<\/td>\n How is part orientation controlled, and how is mask wear or replacement managed?<\/td>\n<\/tr>\n \nSeparate component or alternate design<\/td>\n Avoid selective masking by splitting the function or finish<\/td>\n Does the change affect assembly, appearance, cost, or supplier responsibility?<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\nA finishing supplier\u2019s published process information can help frame questions, not replace qualification. Hi-Tek, for instance, lists multiple masking lacquer products for different plating and anodizing conditions, with different application and removal characteristics. The implication for a buyer is simple: specify the outcome and obtain confirmation that the selected resist is compatible with the actual route. Do not copy a product name or process note from another part\u2019s report.<\/p>\n
Make the boundary unambiguous in the RFQ<\/h2>\n For selective plating masking, the drawing should show the plated and unplated areas in views that make the boundary locatable. Identify the relevant surface and use a datum or dimension from a stable feature. If the boundary follows a thread, hole, bend, weld, or edge, provide a view or detail that removes ambiguity. A shaded illustration may help, but it should supplement\u2014not replace\u2014the controlled drawing dimensions and notes.<\/p>\n
State whether the entire feature remains unplated or only a portion of it. For a threaded hole, distinguish the thread from the surrounding face if both have different requirements. For a mounting tab, define whether the hole wall, seating face, or both are protected. For an appearance boundary, identify which side receives chrome and which side stays bare, and indicate the viewing direction that matters. If the product uses left- and right-hand parts, mark the applicable orientation so the mask is not mirrored incorrectly.<\/p>\n
Do not invent a universal boundary tolerance. Choose the tolerance based on the function, geometry, finishing capability, and assembly need. Where the buyer cannot set a justified number, ask the supplier to propose a capability-based limit on a sample drawing; review that proposal against fit and appearance before release. The approved sample should not become a substitute for a missing dimension if later production must be measured.<\/p>\n
A useful RFQ package identifies:<\/p>\n
\nThe part number, drawing revision, substrate, and intended finish.<\/li>\n The surface or feature that must remain unplated, with a drawing reference.<\/li>\n Whether the purpose is function, appearance, process contact, or a combination.<\/li>\n The post-finish thread, fit, seating, or mating condition to preserve.<\/li>\n The allowed location and visibility of any rack-contact witness mark.<\/li>\n The supplier\u2019s proposed masking method and confirmation that it suits the actual plating route.<\/li>\n The sample and inspection evidence required before bulk approval.<\/li>\n The person responsible for approving a deviation or a change to the finish process.<\/li>\n<\/ul>\nThese inputs make quotations more comparable. One supplier may include a fixture or repeated masking operation, while another may propose a different component split or process route. Comparing only the quoted finish name hides those differences. Buyers should compare the finished condition and the required controls, then ask suppliers to state any assumptions in their quote.<\/p>\n
Approve the first sample against a defined reference<\/h2>\n The first sample should represent the production-intent part and finishing route as closely as practical. Record the part revision, substrate, finish source, sample date, and any known process change. If the sample uses a different mask, fixture, or plating sequence from the intended bulk route, write that difference down and decide whether another approval sample is needed.<\/p>\n
Review the boundary from the viewing angles that matter for the product, but also inspect the functional area. Confirm that the mask has not allowed unwanted plating into a thread or mating zone, and check for residue after removal. If a fastener or mating component is part of the assembly, use the intended item or a controlled equivalent to check assembly rather than relying on a photograph alone. The buyer and supplier should agree who records the result and which revision becomes the reference.<\/p>\n
Do not turn a visual boundary review into a claim about corrosion performance, coating thickness, or service life. Those are different questions that need suitable methods and project-specific acceptance criteria. Similarly, a clean-looking sample does not establish repeatability across all parts. The buyer should ask how the supplier keeps the part oriented, repeats the mask position, and detects drift or mask damage during production.<\/p>\nReview the masked feature and the finished component as a single approval question: does the edge protect the function without creating an unacceptable visible defect?<\/figcaption><\/figure>\nFor recurring orders, the control plan should specify how often the boundary is checked and what constitutes a nonconformance. The method may be a visual check against a marked reference, an agreed dimensional measurement, an assembly check, or a combination. The appropriate choice depends on the feature and risk. A photo can document a sample, but lighting, scale, and viewing angle can conceal a small positional difference. Where location matters dimensionally, use a method that relates the edge to a defined datum.<\/p>\n
Distinguish a designed transition from a plating defect and control changes<\/h2>\n A buyer should decide which boundary features are intentional and which are unacceptable. A planned bare zone is not a plating skip if it is correctly located and performs its stated function. Conversely, plating that creeps into a protected thread, an irregular edge across a visible face, or residue left on an assembly surface may be a defect if it violates the approved drawing or sample.<\/p>\n
This distinction is especially important for decorative hardware because appearance expectations can be subjective unless anchored to a reference. State whether the boundary is visible after installation, whether a small transition variation is acceptable, and whether the finish difference is intended to be seen. If the appearance matters from a normal product-viewing position, show that view in the sample approval record. Do not use \u201cclean edge\u201d without defining where and how it is reviewed.<\/p>\n
This article is about electroplating stop-off and selective-plating boundaries. Powder-coating masking has a different process window and different supplier controls; the shared word \u201cmasking\u201d does not make the specifications interchangeable. The buyer should identify the process first, then approve a method for that route.<\/p>\n
Plan for cost, lead time, and corrective action<\/h3>\n Selective masking may add labor, consumables, a fixture, inspection, or mask removal. In some designs, avoiding unwanted deposit can prevent assembly sorting or rework; in others, the extra boundary control may cost more than a design change. The cost effect depends on part geometry, batch size, process route, repeatability, and the supplier\u2019s setup. Request a quotation that identifies any one-time fixture or tooling cost separately from per-piece finishing and inspection.<\/p>\n
If the first sample misses the boundary, do not immediately change the drawing and process at once. First record the miss against the approved revision, confirm whether the cause was an unclear requirement, mask placement, mask failure, part variation, or an unapproved process assumption, then agree on the corrective action. If the boundary itself changes, issue a new drawing revision and approve a new reference sample. If the requirement did not change, the supplier should explain how the control method will prevent recurrence.<\/p>\n
A corrective-action discussion should distinguish containment from permanent correction. Sorting or reworking a lot may address immediate disposition, but the buyer still needs to know how the supplier will restore the boundary in the next run. Agree who can authorize rework, whether the reworked area requires another inspection, and whether the finish or substrate could be affected by removal. Do not assume that stripping and replating is harmless for every material or geometry; ask the finishing specialist to assess it.<\/p>\n
Keep changes traceable across supplier handoffs<\/h3>\n A bathroom-hardware product can involve a component maker, metal fabricator, electroplater, assembler, and importer or brand owner. The approved boundary can be lost when a drawing is forwarded without its finish note, when a new plating supplier receives only a product photo, or when a revised component reuses an old mask. The buyer should keep the controlled drawing and approval record with the purchase specification and make the responsible supplier confirm the current revision.<\/p>\n
Re-approval may be appropriate if the substrate, component geometry, thread, finish supplier, plating chemistry, masking material, fixture, rack orientation, or removal process changes. Not every change necessarily requires a full product requalification, but the supplier should disclose changes that could affect the protected zone. Define which changes require notification, a new sample, or buyer approval before production.<\/p>\n
For OEM development, share the drawing or physical sample early. A metal-hardware factory can help review how the component attaches to the rack, which surfaces are functional, and where a finishing contact mark may be hidden by assembly. If the specialized plating work is performed by a separate supplier, identify that boundary of responsibility at quotation stage. Koitor\u2019s approved manufacturing scope includes metal forming, welding, grinding, polishing, powder coating, assembly, and packaging; this article does not claim in-house electroplating capability. Buyers should confirm plating method and qualification directly with the selected finishing provider. For a broader view of the factory\u2019s confirmed OEM bathroom and home-storage hardware scope<\/a>, review the service page before discussing a project.<\/p>\nAn approved sample ties the drawing boundary to the real assembly and finish handoff.<\/figcaption><\/figure>\nBuyer questions to settle before production<\/h2>\n Before approving the order, confirm the boundary\u2019s location, purpose, and inspection method in writing. Ask whether the finished part\u2019s thread or mating feature will be checked after plating, whether the mask can be removed without residue, and where the supplier expects any process contact mark. Confirm the production-intent sample uses the proposed mask and route, not merely a visually similar substitute.<\/p>\n
Make sure the purchase record identifies the finish supplier or the responsible finishing stage. If a fabricator subcontracts plating, ask who controls the plating drawing and who communicates revisions. A buyer should not need to guess whether the mask note reached the subcontractor. Request a sample approval record with part revision, finish identification, boundary photographs, any functional assembly check, and the disposition of open issues.<\/p>\n
Keep the approved sample or reference images with the controlled drawing. Use consistent viewing conditions for appearance checks; retain a dimension and measurement method when the boundary is functional.<\/p>\n
Foire aux questions<\/h2>\nDoes every chrome bathroom accessory need a masked no-plate zone?<\/h3>\n No. The requirement depends on the component\u2019s function, finish design, assembly, and approved process. Add a no-plate area only when a drawing or buyer requirement explains its purpose.<\/p>\n
Can I simply write \u201cleave the thread bare\u201d?<\/h3>\n That instruction is incomplete if it does not identify which thread or surface, how the boundary is located, and what post-finish assembly condition is required. Reference the controlled drawing and agree how the finished feature will be checked.<\/p>\n
Which masking material should a buyer specify?<\/h3>\n The finishing supplier should recommend a method compatible with the actual plating chemistry, part geometry, boundary, and removal step. The buyer should approve the required result and sample, and request method details where they affect repeatability or risk.<\/p>\n
Is selective-plating masking the same as powder-coating masking?<\/h3>\n No. The processes expose masks to different conditions and require different method selection. A specification for one finish should not be copied to the other without supplier confirmation.<\/p>\n
What should happen if the sample\u2019s boundary is misplaced?<\/h3>\n Record the deviation against the drawing revision, determine whether the requirement or process assumption was unclear, and agree on containment and corrective action. A changed boundary requires a controlled drawing update and renewed approval; a supplier process correction should be verified against the existing requirement.<\/p>\n
Work with Koitor Hardware<\/h2>\n If you are developing a chrome-finished bathroom accessory or a mixed-finish metal component, share the drawing or sample and identify the functional surfaces, visible finish areas, assembly condition, and approval requirements. Koitor can discuss the metal-part structure, OEM sample workflow, and handoff questions within a confirmed project scope; specialized electroplating capability should be confirmed with the selected finishing supplier.<\/p>\n\nReview a Bathroom Hardware Drawing or Sample<\/h3>\n Send the component drawing or physical sample, finish boundary, assembly requirement, expected quantity, and packaging needs. Our team can review metal-part manufacturability and coordinate clear OEM approval inputs before quotation.<\/p>\n
Request a Project Review<\/a> Discuss OEM Hardware<\/a><\/div>\nFinition des surfaces<\/span>Buyer Specifications<\/span>Supplier Evaluation<\/span><\/div>\n<\/section>","protected":false},"excerpt":{"rendered":"Specify selective plating masking for bathroom hardware with clear no-plate zones, fit checks, sample approval, and supplier change control before production.<\/p>","protected":false},"author":1,"featured_media":4208,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[145],"tags":[70,95,90],"class_list":["post-4211","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hardware-sourcing-knowledge","tag-buyer-specifications","tag-supplier-evaluation","tag-surface-finishing"],"_links":{"self":[{"href":"https:\/\/koitorhardware.com\/fr\/wp-json\/wp\/v2\/posts\/4211","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/koitorhardware.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/koitorhardware.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/koitorhardware.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/koitorhardware.com\/fr\/wp-json\/wp\/v2\/comments?post=4211"}],"version-history":[{"count":1,"href":"https:\/\/koitorhardware.com\/fr\/wp-json\/wp\/v2\/posts\/4211\/revisions"}],"predecessor-version":[{"id":4212,"href":"https:\/\/koitorhardware.com\/fr\/wp-json\/wp\/v2\/posts\/4211\/revisions\/4212"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/koitorhardware.com\/fr\/wp-json\/wp\/v2\/media\/4208"}],"wp:attachment":[{"href":"https:\/\/koitorhardware.com\/fr\/wp-json\/wp\/v2\/media?parent=4211"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/koitorhardware.com\/fr\/wp-json\/wp\/v2\/categories?post=4211"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/koitorhardware.com\/fr\/wp-json\/wp\/v2\/tags?post=4211"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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