{"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\/da\/what-is-a-truly-halogen-free-pcb\/","title":{"rendered":"Hvad er et \u00e6gte halogenfrit printkort?"},"content":{"rendered":"

IEC har fastsat halogenfrie standarder for printkortproducenter, men hvad er et halogenfrit printkort egentlig? Elektroniske produkter indeholder nogle specifikke materialer. Disse materialer kan indeholde halogener p\u00e5 det h\u00f8jest tilladte niveau. For at skabe et \u201chalogenfrit printkort\u201d skal du udskifte nogle materialer eller reducere brugen af dem p\u00e5 kortet. Du skal ogs\u00e5 beslutte, hvor meget halogen der m\u00e5 v\u00e6re i kredsl\u00f8bet. Nogle erstatningsmaterialer kr\u00e6ver s\u00e6rlig designpleje, og det skal du ogs\u00e5 t\u00e6nke p\u00e5.<\/p>\n\n\n\n

Halogener i PCB'er<\/h2>\n\n\n\n

Hvis du sp\u00f8rger de fleste designere, hvor halogener findes i et PCB, er de m\u00e5ske ikke sikre. Halogener findes normalt i bromerede flammeh\u00e6mmere (BFR'er), klorerede opl\u00f8sningsmidler og polyvinylklorid (PVC). Halogener er ikke altid farlige i alle former eller p\u00e5 alle niveauer. At holde et PVC-r\u00f8r eller drikke vand fra hanen vil ikke give sundhedsproblemer. Men hvis du br\u00e6nder r\u00f8ret og ind\u00e5nder den klorgas, der frigives, n\u00e5r plasten nedbrydes, er det en anden sag. Det er det st\u00f8rste problem med halogener i elektronik. De kan frigives i slutningen af PCB'ens livscyklus. S\u00e5 hvor finder man halogener i et printkort?<\/p>\n\n\n\n

Som du ved, bruges PVC ikke kun i r\u00f8r, men ogs\u00e5 i ledningsisolering, s\u00e5 det kan v\u00e6re en kilde til halogener. Klorerede opl\u00f8sningsmidler kan bruges til at reng\u00f8re PCB'er under fremstillingen. BFR'er bruges i PCB-laminater for at mindske risikoen for brand. Nu hvor vi har tjekket de vigtigste kilder til halogener i et kredsl\u00f8b, hvad skal vi s\u00e5 g\u00f8re?<\/p>\n\n\n\n

Halogenfri PCB<\/h2>\n\n\n\n

Ligesom RoHS-reglen om blyfrihed beder den halogenfri standard CM om at bruge nye materialer og nye fremstillingsmetoder. Som enhver standard, der er fastsat af forskellige grupper, har \u201chalogenfri\u201d sine egne klare gr\u00e6nser. IEC definerer halogenfrihed som mindre end 900 ppm klor og brom og mindre end 1.500 ppm halogener i alt. RoHS har ogs\u00e5 sine egne gr\u00e6nser.<\/p>\n\n\n\n

S\u00e5 hvorfor sp\u00f8rger folk stadig efter \u201chalogenfri\u201d i anf\u00f8rselstegn? Fordi opfyldelse af standarden ikke altid betyder, at dit printkort slet ikke indeholder halogener. IPC har f.eks. tests til at p\u00e5vise halogener i PCB'er, og disse tests p\u00e5viser normalt ionbundne halogener. Men de fleste halogener, der findes i flux, er kovalent bundet, s\u00e5 denne test kan ikke opdage dem. Det betyder, at man skal g\u00e5 l\u00e6ngere end standarden for at lave et virkelig halogenfrit print.<\/p>\n\n\n\n

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

Hvis du leder efter en specifik halogenkilde, er en af dem TBBPA, en almindelig BFR, der bruges i laminater. For at fjerne denne kilde skal du specificere et halogenfrit laminat, f.eks. et aktivt fosforbaseret laminat. Din flux og dit loddetin kan ogs\u00e5 bringe halogener ind i printkortet, s\u00e5 du skal ogs\u00e5 tale med CM om mulige erstatninger der. Det kan v\u00e6re sv\u00e6rt at bruge nye materialer og nye metoder p\u00e5 printet, men halogenfri kredsl\u00f8b har nogle fordele. Halogenfrie printkort har normalt en god termisk p\u00e5lidelighed, hvilket betyder, at de er bedre egnet til den h\u00f8jtemperaturproces, der er n\u00f8dvendig for blyfrie kredsl\u00f8b. De har ogs\u00e5 ofte en lavere dielektrisk konstant, hvilket hj\u00e6lper, hvis man \u00f8nsker at bevare signalintegriteten.<\/p>\n\n\n\n

Halogenfrit kortdesign<\/h2>\n\n\n\n

Fordelene ved halogenfri tavler kommer p\u00e5 bekostning af mere kompleksitet, ikke kun i produktionen, men ogs\u00e5 i designet. Et godt eksempel er halogenfrit loddetin og flusmiddel. Halogenfri typer kan nogle gange \u00e6ndre forholdet mellem loddemetal og flusmiddel og for\u00e5rsage loddeperler. Det er, n\u00e5r loddetinnet danner en stor kugle i stedet for at sprede sig p\u00e5 tv\u00e6rs af samlingen. En m\u00e5de at l\u00f8se dette p\u00e5 er at bruge loddemaske til at definere puderne mere tydeligt. Det hj\u00e6lper med at kontrollere loddepastaen og reducerer fejlene.<\/p>\n\n\n\n

Mange nye materialer har deres egne designgr\u00e6nser, s\u00e5 det kan v\u00e6re n\u00f8dvendigt at tjekke med producenten eller lave lidt research, f\u00f8r du bruger dem. Antallet af halogenfrie printkort vokser, men de er stadig langt fra almindelige. Du b\u00f8r ogs\u00e5 tale med din CM for at se, om de kan lave printkort med halogenfrie materialer.<\/p>\n\n\n\n

Med tiden synes vi at finde flere og flere materialer i dagligdagen, som kan udg\u00f8re en sundhedsrisiko. Derfor har grupper som IEC udviklet standarder for halogenfri tavler. Husk, hvor halogener normalt findes, f.eks. i BFR'er, opl\u00f8sningsmidler og isoleringsmaterialer, s\u00e5 du ved, hvad du skal udskifte, hvis du har brug for en halogenfri printplade. Forskellige standarder tillader forskellige halogenniveauer, og nogle kan m\u00e5ske eller m\u00e5ske ikke registrere visse typer halogener. Du er n\u00f8dt til at lave din research f\u00f8rst, s\u00e5 du ved, hvor problemomr\u00e5derne er i dit printkort. N\u00e5r du ved, hvilke materialer du skal bruge, er det bedst at tjekke med din producent og CM for at finde den bedste vej frem. Det kan v\u00e6re n\u00f8dvendigt at justere designet eller arbejde sammen med CM'en om nogle produktionstrin, s\u00e5 dit printkort kan blive bygget med succes.<\/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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