{"id":4989,"date":"2026-06-01T09:07:14","date_gmt":"2026-06-01T09:07:14","guid":{"rendered":"https:\/\/flj-pcb.com\/?p=4989"},"modified":"2026-06-01T09:07:17","modified_gmt":"2026-06-01T09:07:17","slug":"what-is-a-truly-halogen-free-pcb","status":"publish","type":"post","link":"https:\/\/flj-pcb.com\/de_at\/what-is-a-truly-halogen-free-pcb\/","title":{"rendered":"Was ist eine wirklich halogenfreie Leiterplatte?"},"content":{"rendered":"

Die IEC hat f\u00fcr Leiterplattenhersteller Standards f\u00fcr halogenfreie Leiterplatten festgelegt, aber was ist eine halogenfreie Leiterplatte eigentlich genau? Elektronische Produkte enthalten bestimmte Materialien. Diese Materialien d\u00fcrfen Halogene bis zur h\u00f6chstzul\u00e4ssigen Konzentration enthalten. Um eine \u201chalogenfreie Leiterplatte\u201d herzustellen, m\u00fcssen einige Materialien ersetzt oder deren Verwendung auf der Leiterplatte reduziert werden. Au\u00dferdem muss entschieden werden, wie viel Halogen im Schaltkreis verbleiben darf. Einige Ersatzmaterialien erfordern besondere Sorgfalt bei der Konstruktion, und auch das muss ber\u00fccksichtigt werden.<\/p>\n\n\n\n

Halogene in PCBs<\/h2>\n\n\n\n

Wenn man die meisten Entwickler fragt, wo sich Halogene in einer Leiterplatte befinden, wissen sie es vielleicht nicht genau. Halogene kommen in der Regel in bromierten Flammschutzmitteln (BFRs), chlorierten L\u00f6sungsmitteln und Polyvinylchlorid (PVC) vor. Halogene sind nicht in jeder Form oder bei jeder Konzentration gef\u00e4hrlich. Das Anfassen eines PVC-Rohrs oder das Trinken von Leitungswasser verursacht keine Gesundheitsprobleme. Wenn man dieses Rohr jedoch verbrennt und das bei der Zersetzung des Kunststoffs freigesetzte Chlorgas einatmet, sieht die Sache anders aus. Das ist das Hauptproblem bei Halogenen in der Elektronik. Sie k\u00f6nnen am Ende des Lebenszyklus einer Leiterplatte freigesetzt werden. Wo also sind Halogene in einer Leiterplatte zu finden?<\/p>\n\n\n\n

Wie Sie wissen, wird PVC nicht nur in Rohren, sondern auch in der Isolierung von Kabeln verwendet, sodass es eine Quelle f\u00fcr Halogene sein kann. Zur Reinigung von Leiterplatten w\u00e4hrend der Herstellung k\u00f6nnen chlorierte L\u00f6sungsmittel zum Einsatz kommen. BFRs werden in Leiterplattenlaminaten verwendet, um die Brandgefahr zu verringern. Nachdem wir nun die Hauptquellen f\u00fcr Halogene in einer Schaltung \u00fcberpr\u00fcft haben, was sollten wir tun?<\/p>\n\n\n\n

Halogenfreie Leiterplatte<\/h2>\n\n\n\n

\u00c4hnlich wie die RoHS-Richtlinie zur Bleifreiheit verlangt auch die Norm zur Halogenfreiheit vom Auftragsfertiger, neue Materialien und neue Fertigungsverfahren einzusetzen. Wie jeder von verschiedenen Gruppen festgelegte Standard hat auch \u201chalogenfrei\u201d seine eigenen klaren Grenzwerte. Die IEC definiert \u201ehalogenfrei\u201c als weniger als 900 ppm Chlor und Brom sowie weniger als 1.500 ppm Gesamt-Halogene. Auch die RoHS-Richtlinie hat ihre eigenen Grenzwerte.<\/p>\n\n\n\n

Warum fragen die Leute dann immer noch nach \u201chalogenfrei\u201d in Anf\u00fchrungszeichen? Weil die Einhaltung der Norm nicht immer bedeutet, dass Ihre Leiterplatte \u00fcberhaupt keine Halogene enth\u00e4lt. IPC f\u00fchrt beispielsweise Tests durch, um Halogene in Leiterplatten nachzuweisen, und diese Tests erkennen in der Regel ionisch gebundene Halogene. Die meisten in Flussmitteln enthaltenen Halogene sind jedoch kovalent gebunden, sodass dieser Test sie nicht nachweisen kann. Das bedeutet, dass Sie \u00fcber die Norm hinausgehen m\u00fcssen, um eine wirklich halogenfreie Leiterplatte herzustellen.<\/p>\n\n\n\n

\"Halogen-Free<\/figure>\n\n\n\n

Wenn Sie nach einer bestimmten Halogenquelle suchen, ist TBBPA eine davon \u2013 ein h\u00e4ufig in Laminaten verwendeter BFR. Um diese Quelle zu beseitigen, m\u00fcssen Sie ein halogenfreies Laminat spezifizieren, beispielsweise ein Laminat auf Basis von aktivem Phosphor. Auch Ihr Flussmittel und Ihr Lot k\u00f6nnen Halogene in die Leiterplatte einbringen, daher m\u00fcssen Sie mit dem Auftragsfertiger \u00fcber m\u00f6gliche Ersatzstoffe sprechen. Die Verwendung neuer Materialien und Verfahren auf der Leiterplatte kann schwierig sein, aber halogenfreie Schaltungen bieten einige Vorteile. Halogenfreie Leiterplatten weisen in der Regel eine gute thermische Zuverl\u00e4ssigkeit auf, was bedeutet, dass sie besser f\u00fcr den bei bleifreien Schaltungen erforderlichen Hochtemperaturprozess geeignet sind. Oft haben sie zudem eine niedrigere Dielektrizit\u00e4tskonstante, was hilfreich ist, wenn Sie die Signalintegrit\u00e4t aufrechterhalten m\u00f6chten.<\/p>\n\n\n\n

Halogenfreies Leiterplattendesign<\/h2>\n\n\n\n

Die Vorteile halogenfreier Leiterplatten gehen mit einer h\u00f6heren Komplexit\u00e4t einher, nicht nur bei der Fertigung, sondern auch beim Design. Ein gutes Beispiel hierf\u00fcr sind halogenfreies Lot und Flussmittel. Bei halogenfreien Typen kann sich das Verh\u00e4ltnis zwischen Lot und Flussmittel manchmal ver\u00e4ndern und zu Lotperlenbildung f\u00fchren. Dabei bildet das Lot eine gro\u00dfe Kugel, anstatt sich \u00fcber die L\u00f6tstelle zu verteilen. Eine M\u00f6glichkeit, dies zu beheben, besteht darin, die L\u00f6tpads mithilfe einer L\u00f6tmaske deutlicher abzugrenzen. Dies hilft, die Lotpaste besser zu kontrollieren und Fehler zu reduzieren.<\/p>\n\n\n\n

Viele neue Materialien unterliegen bestimmten konstruktiven Einschr\u00e4nkungen, daher sollten Sie sich vor der Verwendung beim Hersteller erkundigen oder selbst recherchieren. Die Auswahl an halogenfreien Leiterplatten w\u00e4chst zwar, doch sind sie noch lange nicht weit verbreitet. Sie sollten sich auch mit Ihrem Auftragsfertiger in Verbindung setzen, um zu kl\u00e4ren, ob dieser Leiterplatten aus halogenfreien Materialien herstellen kann.<\/p>\n\n\n\n

Im Laufe der Zeit scheinen wir immer mehr Materialien im Alltag zu finden, die Gesundheitsrisiken bergen k\u00f6nnen. Aus diesem Grund haben Organisationen wie die IEC Normen f\u00fcr halogenfreie Leiterplatten entwickelt. Merken Sie sich, wo Halogene \u00fcblicherweise vorkommen, beispielsweise in BFRs, L\u00f6sungsmitteln und Isoliermaterialien, damit Sie wissen, was Sie ersetzen m\u00fcssen, wenn Sie eine halogenfreie Leiterplatte ben\u00f6tigen. Verschiedene Standards lassen unterschiedliche Halogengehalte zu, und manche erkennen bestimmte Arten von Halogenen, andere wiederum nicht. Sie m\u00fcssen sich zun\u00e4chst informieren, damit Sie wissen, wo die Problembereiche in Ihrer Leiterplatte liegen. Nachdem Sie wissen, welche Materialien Sie verwenden m\u00fcssen, sollten Sie sich am besten mit Ihrem Hersteller und Ihrem Auftragsfertiger abstimmen, um den besten Weg nach vorne zu finden. M\u00f6glicherweise m\u00fcssen Sie das Design anpassen oder bei einigen Fertigungsschritten mit dem Auftragsfertiger zusammenarbeiten, damit Ihre Leiterplatte erfolgreich hergestellt werden kann.<\/p>\n\n\n\n

<\/p>","protected":false},"excerpt":{"rendered":"

IEC has set halogen-free standards for PCB makers, but what is a halogen-free PCB, really? Electronic products contain some specific 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