{"id":2356,"date":"2026-11-05T09:10:00","date_gmt":"2026-11-05T01:10:00","guid":{"rendered":"https:\/\/lemaele.com\/blog\/micro-switch-fungal-resistance\/"},"modified":"2026-11-04T11:10:57","modified_gmt":"2026-11-04T03:10:57","slug":"micro-switch-fungal-resistance","status":"publish","type":"post","link":"https:\/\/lemaele.com\/de\/blog\/micro-switch-fungal-resistance\/","title":{"rendered":"Mikroschalter Pilzresistenz: \u00dcberpr\u00fcfung der Materialien, Kontamination und Pr\u00fcfumfang"},"content":{"rendered":"<style>.lema-article{max-width:100%;min-width:0}.lema-article img{max-width:100%;height:auto}.lema-article table{border-collapse:collapse;min-width:580px}.lema-article th,.lema-article td{border:1px solid #ddd;padding:10px;text-align:left;vertical-align:top}<\/style>\n<div class=\"lema-article\">\n<p>Micro switch fungal resistance cannot be established from housing color, an ingress rating or a general humidity limit. For a damp-service purchasing decision, identify the exact materials and assembly, describe the contamination and moisture conditions, and request evidence whose specimens and acceptance criteria match the proposed use. A clean-looking sample is not a fungal test result. This guide helps OEM buyers distinguish material susceptibility, surface contamination and complete-switch performance before asking for a quotation or approving a substitution.<\/p>\n<p>The <a href=\"https:\/\/lemaele.com\/product\/kw7-series-micro-switch\/\">KW7 series micro switch<\/a> is the product reference for this review. Its published electrical and mechanical information can support ordinary selection questions, but it does not establish a fungal-resistance classification. The steps below are an inquiry and review workflow, not a claim that KW7 has passed a biological exposure test.<\/p>\n<h2>Start with the actual contamination question<\/h2>\n<p>A request that says only \u201cfungus proof switch required\u201d leaves several different questions unanswered. Is the concern visible growth on an external housing, contamination at an exposed terminal, material deterioration, or electrical behavior after a defined exposure? These are different acceptance questions. Ask the responsible equipment designer which outcome would make the assembly unsuitable. That answer should guide the document request instead of allowing a supplier&#8217;s most convenient certificate to define the requirement.<\/p>\n<p>Write a short service description before selecting a method. Include where the switch sits, how the enclosure is ventilated, whether equipment is stored before installation, and which cleaning or handling processes contact nearby parts. Describe observed contamination without diagnosing its biological identity from a photograph. A laboratory or other qualified specialist may be needed to identify an unknown deposit. An unexplained mark should remain an observation in the record until evidence supports a more specific conclusion.<\/p>\n<h2>Separate the material from what lands on it<\/h2>\n<p>A material&#8217;s behavior and the behavior of contamination on its surface are not interchangeable. A clean polymer specimen and an assembled switch exposed to process residues represent different questions. Record whether the concern relates to the housing compound itself, an added label or coating, packaging residue, nearby lubricant, or a combination. Do not assume that a result for one item establishes the behavior of every external surface.<\/p>\n<p>The <a href=\"https:\/\/store.astm.org\/g0021-09.html\" rel=\"noopener\" target=\"_blank\">ASTM G21 scope<\/a> addresses fungal effects on synthetic polymeric materials and notes that additives and conditioning can matter. That is a useful reason to request the actual material reference and specimen history. It is not permission to assign an ASTM result to a complete switch without applicable documentation. A report should name the material or assembly tested clearly enough to make that distinction reviewable.<\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/lemaele.com\/wp-content\/uploads\/2026\/11\/lema-micro-switch-fungal-resistance-body1-20261104.webp\" alt=\"KW7 roller lever micro switch beside separate empty inspection tray and magnifier on pale blue surface\" width=\"1536\" height=\"1024\" loading=\"lazy\" title=\"\"><figcaption>KW7 roller lever micro switch beside separate empty inspection tray and magnifier on pale blue surface. Product-reference illustration; not a certification, laboratory result or approved installation.<\/figcaption><\/figure>\n<h2>Ask for a controlled material reference<\/h2>\n<p>Begin with the delivered part code and revision. Ask which controlled material reference covers relevant exposed insulating parts, and whether an available biological-exposure report applies to that reference. The supplier may need to provide a restricted material identifier rather than a complete proprietary recipe. The practical goal is traceable applicability: a reviewer should be able to tell whether a report and the supplied item refer to the same construction.<\/p>\n<p>Do not infer resin identity from a black housing, a molded appearance or a different product in the same family. Also avoid treating a broad sales phrase such as \u201csuitable for harsh environments\u201d as an exposure specification. If the material reference is unavailable, record the missing evidence and ask what alternative substantiation can be supplied. Keep the sourcing decision open rather than replacing an unknown with a guess.<\/p>\n<h2>Build an evidence request the laboratory can answer<\/h2>\n<p>The request should connect service concerns to measurable outcomes. Define the assembly being assessed, its condition when supplied, relevant mounting arrangements, and the functions that must remain acceptable. Agree who chooses the applicable procedure and who approves the final criteria. Buyers should not invent inoculation recipes, incubation limits or pass grades from abbreviated internet descriptions. Specialized biological testing belongs with a competent facility using an agreed method.<\/p>\n<p><a href=\"https:\/\/standards.nasa.gov\/sites\/default\/files\/standards\/KSC\/C\/0\/KSC-STD-164_RevC-Final.pdf\" rel=\"noopener\" target=\"_blank\">NASA KSC-STD-164 Revision C<\/a> provides an example of environmental-test documentation that treats fungus testing and control checks explicitly. Its scope concerns particular ground-support equipment; it is not a universal micro switch purchasing specification. Use it to understand why method, controls and recorded functional requirements matter, while the equipment owner determines the requirements applicable to the actual project.<\/p>\n<div class=\"lema-table\" style=\"max-width:100%;overflow-x:auto\">\n<table>\n<thead>\n<tr>\n<th scope=\"col\">Review item<\/th>\n<th scope=\"col\">Evidence to request<\/th>\n<th scope=\"col\">Question left open without it<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Delivered switch<\/td>\n<td>Part code, lot and controlled revision<\/td>\n<td>Does the report cover this construction?<\/td>\n<\/tr>\n<tr>\n<td>Material boundary<\/td>\n<td>Named housing, exposed parts or whole assembly<\/td>\n<td>Which surfaces and functions were assessed?<\/td>\n<\/tr>\n<tr>\n<td>Specimen history<\/td>\n<td>Conditioning, handling and relevant residues<\/td>\n<td>Does the sample represent the intended question?<\/td>\n<\/tr>\n<tr>\n<td>Assessment<\/td>\n<td>Procedure, controls, observations and functional criteria<\/td>\n<td>What was actually demonstrated?<\/td>\n<\/tr>\n<tr>\n<td>Release<\/td>\n<td>Applicability statement and change notification<\/td>\n<td>When must the decision be reviewed again?<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>The table is a proposed purchasing worksheet. It contains no assigned test severity, service-life prediction or KW7 qualification. Each row should be completed with project-specific information before a test request becomes an acceptance requirement.<\/p>\n<h2>Review the report before accepting its headline<\/h2>\n<p>Read the specimen description before reading the conclusion. Check the material reference, lot or revision, number and condition of specimens, and whether the assessed item was a material sample, a housing or an assembled component. If the report concerns a coupon, ask which decision it supports and which complete-component questions remain open. A useful report can have a narrow scope; the mistake is silently expanding that scope during purchasing.<\/p>\n<p>Next examine the observations and stated limits. Does the report distinguish visible growth from retained functional behavior? Are the relevant checks identified, with results recorded at the agreed stages? Were required controls acceptable? Ask for clarification when a summary omits the underlying findings. Keep the original report and the supplier&#8217;s applicability statement together so a later buyer can reproduce the approval reasoning.<\/p>\n<h2>Retain electrical and mechanical selection checks<\/h2>\n<p>Biological evidence does not replace the ordinary form, fit and function review. The proposed switch must still match the equipment&#8217;s circuit and actuator requirements. Use the <a href=\"https:\/\/lemaele.com\/blog\/micro-switch-replacement-guide\/\">micro switch replacement guide<\/a> to organize that wider comparison. A positive material report cannot correct the wrong contact arrangement, unsuitable mounting or an actuator that does not return as required by the machine design.<\/p>\n<p>Likewise, keep the distinctions in <a href=\"https:\/\/lemaele.com\/blog\/micro-switch-insulation-resistance-dielectric-strength\/\">insulation resistance and dielectric strength<\/a> visible in the qualification plan. These checks answer different questions, and their conditions must be defined by the applicable specification. Do not create a universal post-exposure limit from an initial catalog value. The responsible reviewer must decide what retained performance is required and how it will be assessed safely.<\/p>\n<figure><img decoding=\"async\" src=\"https:\/\/lemaele.com\/wp-content\/uploads\/2026\/11\/lema-micro-switch-fungal-resistance-body2-20261104.webp\" alt=\"KW7 roller lever micro switch beside separate closed folder and open empty box on ochre surface\" width=\"1536\" height=\"1024\" loading=\"lazy\" title=\"\"><figcaption>KW7 roller lever micro switch beside separate closed folder and open empty box on ochre surface. Product-reference illustration; not a certification, laboratory result or approved installation.<\/figcaption><\/figure>\n<h2>Investigate a field finding without destroying evidence<\/h2>\n<p>If a deposit or suspected growth is discovered in equipment, preserve the location, surrounding condition and maintenance history before changing the part. Follow the site&#8217;s isolation and handling arrangements. Avoid opening or cleaning an energized assembly for investigation. Where health or contamination concerns exist, involve the appropriate site specialist rather than treating the switch as a household cleaning exercise.<\/p>\n<p>Separate the immediate return-to-service decision from the investigation. A replacement may be needed under an approved maintenance procedure, while the removed item remains useful evidence. Record which surfaces were affected and which symptoms were observed. Do not spray an unapproved biocide or solvent into the switch to see whether the symptom disappears. That can introduce another exposure and make the original condition harder to interpret.<\/p>\n<p>For cleaning-process questions, consult the separate <a href=\"https:\/\/lemaele.com\/blog\/micro-switch-cleaning-solvent-compatibility\/\">micro switch solvent compatibility review<\/a>. The biological question does not establish cleaner compatibility. Keep any cleaning proposal, supplier response and subsequent verification in a separate controlled record, cross-referenced to the original observation.<\/p>\n<h2>Compare supplier replies on the same basis<\/h2>\n<p>One supplier may provide a material statement while another provides a component report. Place both against the same worksheet instead of ranking them by document length or the number of standard names on the cover. Identify what is demonstrated, what is inferred and what remains unresolved. If a requested report is unavailable, a technically honest reply can still support a decision about further investigation; it cannot be relabeled as a pass.<\/p>\n<p>When a supplier proposes a different construction, restart the applicability review for the changed parts. Record whether exposed materials, labels, coatings, terminals or production conditions differ. Keep the commercial comparison separate from the technical release decision. Price and delivery can be compared immediately, while approval remains conditional on the agreed evidence. This avoids purchasing a convenient substitute whose supporting documents concern another assembly.<\/p>\n<h2>Prepare a practical RFQ package<\/h2>\n<p>Send the exact part reference, installation sketch, operating environment narrative and the intended fungal-evidence question. Include photographs of the actual location when available, with confidential information removed. State whether the request is for a material declaration, review of an existing test report or a quotation for additional assessment. These are different tasks and should receive separate answers and lead times.<\/p>\n<p>Ask the supplier to identify the document revision and the delivered configurations it covers. Request notification before changes that could affect the approved evidence. Retain open questions in the sample approval record, assign an owner, and define the condition for closing each one. The result should be a decision someone can audit later, not an email chain containing an unexplained \u201cfungus resistant\u201d phrase.<\/p>\n<h2>Further learning: fungal form and decomposition<\/h2>\n<p>The University of Illinois Extension webinar below introduces fungal biology and decomposition. Its form-and-function and saprotroph sections provide background for understanding why a biological-material question differs from an ordinary damp-storage check. It does not test switches, establish a method for this application or certify any Lemaele product. Use it as optional background after the written purchasing review.<\/p>\n<p>University of Illinois Extension: Fungus Among Us: An Insight to Fungi in Illinois Ecosystems, Everyday Environment<\/p>\n<div style=\"position:relative;width:100%;aspect-ratio:16\/9\"><iframe style=\"position:absolute;inset:0;width:100%;height:100%;border:0\" src=\"https:\/\/www.youtube-nocookie.com\/embed\/rlbIiCLPDz4\" title=\"Fungus Among Us: An Insight to Fungi in Illinois Ecosystems, Everyday Environment\" loading=\"lazy\" allow=\"accelerometer; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/div>\n<p><a rel=\"noopener\" href=\"https:\/\/www.youtube.com\/watch?v=rlbIiCLPDz4\" target=\"_blank\">Watch Fungus Among Us: An Insight to Fungi in Illinois Ecosystems, Everyday Environment<\/a>.<\/p>\n<h2>Frequently asked questions<\/h2>\n<h3>Does an IP rating establish fungal resistance?<\/h3>\n<p>No. Ingress protection and biological exposure answer different questions. Request applicable fungal evidence for the exact construction.<\/p>\n<h3>Can a housing coupon qualify the entire switch?<\/h3>\n<p>Not by itself. Establish which material question it answers and which complete-component functions still need assessment.<\/p>\n<h3>Should an unknown deposit be called fungus from a photograph?<\/h3>\n<p>No. Preserve the observation and obtain appropriate identification when the decision requires it.<\/p>\n<h3>Does this article give KW7 a fungal rating?<\/h3>\n<p>No. No fungal classification or biological test pass is established for KW7 here.<\/p>\n<\/div>\n<p><script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Does an IP rating establish fungal resistance?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No. Ingress protection and biological exposure answer different questions. 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