{"id":4270,"date":"2026-10-15T22:29:14","date_gmt":"2026-10-15T14:29:14","guid":{"rendered":"https:\/\/www.carbon-fiber-corp.com\/composite-porosity-measurement-context\/"},"modified":"2026-10-15T22:29:14","modified_gmt":"2026-10-15T14:29:14","slug":"composite-porosity-measurement-context","status":"publish","type":"post","link":"https:\/\/www.carbon-fiber-corp.com\/it\/composite-porosity-measurement-context\/","title":{"rendered":"Composite Porosity: Ask What the Measurement Actually Represents"},"content":{"rendered":"<style>.ly-note{max-width:880px;margin:0 auto;color:#26333c;line-height:1.85;font-size:17px}.ly-note h2{font-size:1.5rem;line-height:1.35;margin:1.8em 0 .6em}.ly-note p{margin:0 0 1.2em}.ly-note .intro{font-size:1.08em}.ly-note figure{margin:2em 0}.ly-note figure img{display:block;width:100%;height:auto}.ly-note figcaption{font-size:.88rem;color:#60727d;line-height:1.55;margin-top:10px}.ly-note ul{padding-left:1.4em}.ly-note li{margin:.45em 0}.ly-note a{color:#8e1e34;text-decoration:underline;text-underline-offset:3px}.ly-note .notes{padding:20px 28px;background:#f0f4f5;border-left:3px solid #296c85;margin:2em 0}.ly-note .notes h2{font-size:1.1rem;margin:0 0 .8em}.ly-note .reading{border-top:1px solid #d9e1e5;margin-top:2em;padding-top:1.1em}.single-post .entry-title{font-size:clamp(1.8rem,3.8vw,2.6rem);line-height:1.25}.single-post .post-thumb-img-content img{width:100%;height:auto;max-height:360px;object-fit:contain;background:#fbfcfc}@media(max-width:600px){.ly-note{font-size:16px}.ly-note h2{font-size:1.3rem}.ly-note .notes{padding:17px}}<\/style>\n<div class=\"ly-note\">\n<p class=\"intro\">A porosity result needs a method and a defined sample. A surface photograph, a local section and a non-destructive scan do not describe the same evidence. Before comparing two reported values, check what material was examined and how the result was obtained.<\/p>\n<h2>Start with the sampled region<\/h2>\n<p>A small cut section describes the region it crosses. A scan covers a different area and can depend on calibration, geometry and interpretation. Neither should silently be treated as a direct measurement of every part in a delivery. The NASA composite NDE handbook discusses these method-dependent inspection questions; it is background reading, not an acceptance standard for your order.<\/p>\n<h2>Keep the reported basis with the number<\/h2>\n<p>Ask for the method reference, specimen identification, preparation where applicable, the assessed area or volume and the result units. If the result is derived indirectly, retain the stated assumptions and reference material. A percentage without this context may look precise while being unsuitable for comparison with another report.<\/p>\n<h2>Agree a requirement before the result arrives<\/h2>\n<p>There is no single acceptance limit established by the phrase \u201ccarbon fiber part.\u201d The applicable construction, service requirement and agreed inspection plan matter. If a purchaser needs a particular assessment, include it in the enquiry so specimen allocation, access and reporting are discussed in advance. Surface appearance can still have its own acceptance reference, but it should remain a separate requirement.<\/p>\n<figure><a href=\"https:\/\/www.carbon-fiber-corp.com\/wp-content\/uploads\/2026\/10\/ly-geo-20261015-11-porosity-2.webp\" aria-label=\"Open the full-size diagram\"><img src=\"https:\/\/www.carbon-fiber-corp.com\/wp-content\/uploads\/2026\/10\/ly-geo-20261015-11-porosity-2.webp\" alt=\"Keep the method and assessed region alongside the requirement and disposition.\" width=\"1600\" height=\"1000\" loading=\"lazy\" decoding=\"async\"><\/a><figcaption>Keep the method and assessed region alongside the requirement and disposition. <a href=\"https:\/\/www.carbon-fiber-corp.com\/wp-content\/uploads\/2026\/10\/ly-geo-20261015-11-porosity-2.webp\">View full size<\/a>.<\/figcaption><\/figure>\n<aside class=\"notes\">\n<h2>Useful information for an enquiry<\/h2>\n<ul>\n<li>Method and reporting basis<\/li>\n<li>Part or specimen identification<\/li>\n<li>Assessed region and coverage<\/li>\n<li>Applicable agreed acceptance criterion<\/li>\n<\/ul>\n<\/aside>\n<p>Further reading: <a href=\"https:\/\/ntrs.nasa.gov\/api\/citations\/20200002023\/downloads\/20200002023.pdf\">NASA: composite non-destructive evaluation handbook<\/a>.<\/p>\n<div class=\"reading\">\n<p>Related: <a href=\"https:\/\/www.carbon-fiber-corp.com\/composite-test-coupons-and-finished-parts-know-what-a-result-represents\/\">Composite Test Coupons and Finished Parts: Know What a Result Represents<\/a> \u00b7 <a href=\"https:\/\/www.carbon-fiber-corp.com\/ultrasonic-inspection-carbon-fiber-coverage\/\">Ultrasonic Inspection of Carbon Fiber Parts: Define the Coverage<\/a>.<\/p>\n<p><a href=\"https:\/\/www.carbon-fiber-corp.com\/contact\/\">Discuss your component with Litian Yunde<\/a> \u00b7 <a href=\"https:\/\/www.carbon-fiber-corp.com\/carbon-fiber-guides\/\">Browse the component guides<\/a><\/p>\n<\/div>\n<\/div>\n<p><script type=\"application\/ld+json\" class=\"ly-article-schema\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BlogPosting\", \"@id\": \"https:\/\/www.carbon-fiber-corp.com\/composite-porosity-measurement-context\/#article\", \"headline\": \"Composite Porosity: Ask What the Measurement Actually Represents\", \"description\": \"Porosity results depend on the method, specimen and reported basis. Separate surface appearance from an assessed internal condition before comparing results.\", \"image\": [\"https:\/\/www.carbon-fiber-corp.com\/wp-content\/uploads\/2026\/10\/ly-geo-20261015-11-porosity-1.webp\", \"https:\/\/www.carbon-fiber-corp.com\/wp-content\/uploads\/2026\/10\/ly-geo-20261015-11-porosity-2.webp\"], \"datePublished\": \"2026-10-15T14:29:14Z\", \"mainEntityOfPage\": {\"@type\": \"WebPage\", \"@id\": \"https:\/\/www.carbon-fiber-corp.com\/composite-porosity-measurement-context\/\"}, \"author\": {\"@type\": \"Organization\", \"name\": \"Litian Yunde\", \"url\": \"https:\/\/www.carbon-fiber-corp.com\/about\/\"}, \"publisher\": {\"@type\": \"Organization\", \"name\": \"Dongguan Litian Yunde New Materials Technology Co., Ltd.\", \"url\": \"https:\/\/www.carbon-fiber-corp.com\/\"}, \"inLanguage\": \"en\", \"articleSection\": \"Inspection & Testing\"}<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A porosity result needs a method and a defined sample. A surface photograph, a local section and a non-destructive scan do not describe the same evidence. Before comparing two reported values, check what material was examined and how the result was obtained.<\/p>","protected":false},"author":1,"featured_media":4240,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_seopress_titles_title":"Composite Porosity Measurement Context | Litian Yunde","_seopress_titles_desc":"Porosity results depend on the method, specimen and reported basis. 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