{"id":2308,"date":"2026-09-18T07:59:29","date_gmt":"2026-09-18T07:59:29","guid":{"rendered":"https:\/\/haktak.com\/?p=2308"},"modified":"2026-09-18T07:59:31","modified_gmt":"2026-09-18T07:59:31","slug":"how-to-choose-gap-filler-thickness","status":"publish","type":"post","link":"https:\/\/haktak.com\/de\/how-to-choose-gap-filler-thickness\/","title":{"rendered":"So w\u00e4hlen Sie die Dicke des Spaltf\u00fcllers"},"content":{"rendered":"
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Eine Zeichnung gibt den Spalt mit 1.5 mm an, daher klingt ein 2 mm dicker Gap-Filler sicher. Einfach, oder? Dann treffen die Prototypen ein. Ein Pad ber\u00fchrt das Geh\u00e4use kaum; ein anderes w\u00f6lbt PCB. Die Zeichnung zeigte einen Nennspalt, w\u00e4hrend die Produktion eine Bandbreite lieferte.<\/p>\n\n\n\n

\"Dicke<\/figure>\n\n\n\n

Die Wahl der Dicke des Gap-Fillers ist ein Toleranz- und Kraftproblem mit einem thermischen Ziel. Das Material muss den gr\u00f6\u00dften Spalt ber\u00fchren, sich am kleinsten Spalt sicher komprimieren lassen und beides auch noch gew\u00e4hrleisten, nachdem W\u00e4rme, Vibrationen und Zeit ihre Wirkung entfaltet haben.<\/p>\n\n\n\n

Gap Filler Thickness Means Different Things for Pads and Liquids<\/h2>\n\n\n\n

Gap fillers replace insulating air between a hot component and a cooling surface. Air conducts heat at only about 0.026 W\/m\u00b7K near room temperature. A filled polymer usually conducts far better, although contact, pressure, and thickness still shape the result.<\/p>\n\n\n\n

F\u00fcr vorgeformte W\u00e4rmeleitpads<\/a>, the supplier provides a nominal sheet thickness. The pad becomes thinner when the assembly closes. For a dispensable material, the hardware usually sets the final thickness.<\/p>\n\n\n\n

Begriff<\/td>What it means<\/td>Warum es wichtig ist<\/td><\/tr>
Nenndicke<\/td>Stated thickness of an uncompressed pad<\/td>Used to order the pad<\/td><\/tr>
Supplied thickness range<\/td>Thinnest and thickest pad allowed by manufacturing tolerance<\/td>Changes compression extremes<\/td><\/tr>
Zusammengef\u00fcgte L\u00fccke<\/td>Distance between surfaces after fastening<\/td>Bestimmt in der Regel die aufgetragene Schichtdicke<\/td><\/tr>
Klebschichtdicke oder BLT<\/td>Abschlie\u00dfende TIM-Schicht zwischen den Oberfl\u00e4chen<\/td>Beeinflusst den Grenzfl\u00e4chenwiderstand<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Why a Dispensed Gap Filler Has No Sheet Thickness<\/h3>\n\n\n\n

A fl\u00fcssiger Spaltf\u00fcller<\/a> is deposited as a bead. The parts close to their stops and the material spreads through the available space. The assembled gap becomes its bond line.<\/p>\n\n\n\n

Do not put a liquid filler\u2019s \u201ccompression percentage\u201d into a pad formula. Check its supported gap range, dispense volume, rheology, cure, and retention. Too little leaves dry areas; too much can flood keep-outs.<\/p>\n\n\n\n

\"Dicke<\/figure>\n\n\n\n

Start With a Gap Range, Not One Comfortable Number<\/h2>\n\n\n\n

The nominal CAD dimension helps during concept work, but release needs a tolerance stack. Include:<\/p>\n\n\n\n