{"id":3076,"date":"2026-10-08T17:17:06","date_gmt":"2026-10-08T17:17:06","guid":{"rendered":"https:\/\/yocl.com\/?wpr2_import=f3cf868671a231d98b66f6eb712a054384fe3fa739e3bd359eb2729d03ed3a2b"},"modified":"2026-10-08T17:17:06","modified_gmt":"2026-10-08T17:17:06","slug":"2-1-vs-3-1-vs-4-1-heat-shrink-tubing","status":"publish","type":"post","link":"https:\/\/yocl.com\/es\/2-1-vs-3-1-vs-4-1-heat-shrink-tubing\/","title":{"rendered":"2:1 frente a 3:1 frente a 4:1 Tubo Termorretr\u00e1ctil: \u00bfQu\u00e9 Relaci\u00f3n de Reducci\u00f3n Necesita?"},"content":{"rendered":"<p><strong>Elija la relaci\u00f3n de retracci\u00f3n de la transici\u00f3n de di\u00e1metro que debe cubrir el tubo.<\/strong> El di\u00e1metro interior suministrado debe ser mayor que la caracter\u00edstica m\u00e1s grande, y su di\u00e1metro interior recuperado libremente debe ser menor que la superficie m\u00e1s estrecha que necesita sujetar. Un tama\u00f1o 2:1 adecuado puede completar esa tarea. Considere 3:1 o 4:1 cuando las dimensiones reales requieran un rango de recuperaci\u00f3n m\u00e1s amplio.<\/p>\n<p>Una mayor relaci\u00f3n por s\u00ed sola no proporciona adhesivo, una conexi\u00f3n sellada ni una mayor clasificaci\u00f3n el\u00e9ctrica. Compare primero la geometr\u00eda, luego verifique la construcci\u00f3n y el uso exactos del producto.<\/p>\n<h2>Compare 2:1, 3:1 y 4:1 en la misma geometr\u00eda<\/h2>\n<p>La relaci\u00f3n de retracci\u00f3n describe la relaci\u00f3n nominal entre <strong>el di\u00e1metro interior (ID) expandido<\/strong> y <strong>el ID recuperado libremente<\/strong>. Para una aritm\u00e9tica idealizada:<\/p>\n<p><strong>ID de recuperaci\u00f3n libre = ID expandido \u00f7 n\u00famero de relaci\u00f3n<\/strong><\/p>\n<p>Con el mismo 15 mm de calibre expandido hipot\u00e9tico, 2:1 da 7.5 mm, 3:1 da 5 mm, y 4:1 da 3.75 mm. Estos son puntos finales ilustrativos sin un objeto interno que restrinja la recuperaci\u00f3n, en lugar de dimensiones garantizadas de tres productos del cat\u00e1logo. La relaci\u00f3n describe la recuperaci\u00f3n del di\u00e1metro; no divide la longitud cortada ni identifica el n\u00famero de paredes. El <a href=\"https:\/\/yocl.com\/es\/what-is-heat-shrink-tubing\/\">gu\u00eda de terminolog\u00eda de tubos termorretr\u00e1ctiles<\/a> explica esos campos separados.<\/p>\n<figure class=\"wp-block-image\">\n<img decoding=\"async\" src=\"https:\/\/yocl.com\/wp-content\/uploads\/2026\/10\/2-1-vs-3-1-vs-4-1-heat-shrink-tubing-ratio-comparison.webp\" alt=\"Hypothetical 15 mm expanded bore compared with 7.5, 5 and 3.75 mm freely recovered bores for 2:1, 3:1 and 4:1 tubing\"><figcaption>Conceptual, no a escala. Aritm\u00e9tica nominal para un 15 mm de calibre expandido compartido. Los calibres recuperados vac\u00edos ilustran la recuperaci\u00f3n libre; los l\u00edmites reales del producto a\u00fan rigen la selecci\u00f3n del tama\u00f1o.<\/figcaption><\/figure>\n<p>Ahora sostenga la caracter\u00edstica redonda m\u00e1s grande que el tubo debe atravesar en <strong>13 mm de di\u00e1metro exterior (OD)<\/strong>. Cambie solo la superficie redonda m\u00e1s peque\u00f1a donde debe aterrizar. Las tres fundas hipot\u00e9ticas comienzan con el mismo 15 mm de calibre, por lo que la comparaci\u00f3n a\u00edsla su rango de recuperaci\u00f3n.<\/p>\n<table>\n<thead>\n<tr>\n<th>Di\u00e1metro exterior de aterrizaje m\u00e1s peque\u00f1o<\/th>\n<th>2:1: ID libre 7.5 mm<\/th>\n<th>3:1: ID libre 5 mm<\/th>\n<th>4:1: ID libre 3.75 mm<\/th>\n<th>Relaci\u00f3n suficiente bajo estas suposiciones<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>9 mm<\/td>\n<td>Por debajo del di\u00e1metro exterior de aterrizaje<\/td>\n<td>Por debajo del di\u00e1metro exterior de aterrizaje<\/td>\n<td>Por debajo del di\u00e1metro exterior de aterrizaje<\/td>\n<td>Los tres; 2:1 ya es suficiente geom\u00e9tricamente<\/td>\n<\/tr>\n<tr>\n<td>6 mm<\/td>\n<td>Demasiado grande<\/td>\n<td>Por debajo del di\u00e1metro exterior de aterrizaje<\/td>\n<td>Por debajo del di\u00e1metro exterior de aterrizaje<\/td>\n<td>3:1 o 4:1; 3:1 ya es suficiente geom\u00e9tricamente<\/td>\n<\/tr>\n<tr>\n<td>4.5 mm<\/td>\n<td>Demasiado grande<\/td>\n<td>Demasiado grande<\/td>\n<td>Por debajo del di\u00e1metro exterior de aterrizaje<\/td>\n<td>4:1 solamente<\/td>\n<\/tr>\n<tr>\n<td>3 mm<\/td>\n<td>Demasiado grande<\/td>\n<td>Demasiado grande<\/td>\n<td>Demasiado grande<\/td>\n<td>Ninguno de estos tres candidatos<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Esto es un <strong>comparaci\u00f3n hipot\u00e9tica controlada<\/strong>, no una lista de tama\u00f1os aprobada. La diferencia 2 mm entre el di\u00e1metro interior expandido asumido y el di\u00e1metro exterior de paso es una brecha de ejemplo, no una holgura recomendada. Las tolerancias reales, la holgura de instalaci\u00f3n y el rango de aplicaci\u00f3n permitido quedan por comprobar.<\/p>\n<p>La \u00faltima fila importa: incluso 4:1 puede ser insuficiente. Una relaci\u00f3n m\u00e1s alta extiende el rango nominal, pero ninguna etiqueta garantiza el ajuste en cada transici\u00f3n. Por el contrario, la primera fila no da ninguna raz\u00f3n dimensional para rechazar 2:1 simplemente porque 4:1 est\u00e9 disponible.<\/p>\n<h2>Convertir un candidato de relaci\u00f3n en un tama\u00f1o exacto de tubo<\/h2>\n<p>Para piezas redondas y tubos de extremo abierto, compruebe ambos l\u00edmites de <strong>una fila de tama\u00f1o exacto<\/strong>:<\/p>\n<ul>\n<li><strong>Minimum supplied ID &gt; largest pass-over OD<\/strong><\/li>\n<li><strong>Maximum freely recovered ID &lt; smallest landing OD<\/strong><\/li>\n<\/ul>\n<p>de la NASA <a href=\"https:\/\/standards.nasa.gov\/sites\/default\/files\/standards\/KSC\/F\/KSC-E-165-REV-F.pdf\" target=\"_blank\" rel=\"noopener\">KSC-E-165 Revisi\u00f3n F, \u00a73.8.1.1.1(a)<\/a> uses this expanded-larger\/recovered-smaller principle within Kennedy Space Center electrical ground-support-equipment fabrication. It supports the dimensional relationship, without approving a YOCL product or assembly.<\/p>\n<p>Retain the table&#8217;s minimum, maximum and \u00b1 signs, component tolerances and specified application allowance. Equality supplies no assured margin. A model&#8217;s stated application range may further restrict the usable diameters, even where the preliminary inequalities pass.<\/p>\n<p>If you increase the supplied size to clear a connector, recheck the recovered limit of that larger row. Changing the first diameter can also change the second. Use the <a href=\"https:\/\/yocl.com\/es\/heat-shrink-tubing-size-chart\/\">tabla de tama\u00f1os de tubo termorretr\u00e1ctil<\/a> for the full lookup and limit conventions.<\/p>\n<h3>Free recovery is different from installed fit<\/h3>\n<p>A sleeve installed over a cable stops contracting against the surface inside it. In the hypothetical 4:1 example, a 4.5 mm jacket prevents the bore reaching its empty 3.75 mm endpoint. The endpoint therefore does not specify installed ID, outside diameter or wall thickness.<\/p>\n<figure class=\"wp-block-image\">\n<img decoding=\"async\" src=\"https:\/\/yocl.com\/wp-content\/uploads\/2026\/10\/2-1-vs-3-1-vs-4-1-heat-shrink-tubing-installed-fit.webp\" alt=\"Conceptual comparison of an empty 3.75 mm freely recovered bore and the same nominal 4:1 sleeve constrained by a 4.5 mm cable jacket\"><figcaption>Hypothetical 4:1 example: an internal jacket restricts recovery. Schematic wall thickness is illustrative; the free-recovery bore does not determine installed outside diameter.<\/figcaption><\/figure>\n<p>For a sleeve spanning several surfaces, check the smallest required landing as well as the largest feature it crosses. Irregular connectors, flat busbars, bundles and branches need their actual envelope and contact geometry reviewed; one round OD cannot describe every gap or valley.<\/p>\n<h2>A real YOCL 3:1 vs 4:1 comparison<\/h2>\n<p>La <a href=\"https:\/\/yocl.com\/es\/product\/3-1-zero-halogen-single-wall-heat-shrink-tubing\/\">3:1 Zero-Halogen single-wall product<\/a> y <a href=\"https:\/\/yocl.com\/es\/product\/4-1-zero-halogen-single-wall-heat-shrink-tubing\/\">4:1 Zero-Halogen single-wall product<\/a> offer a useful same-construction comparison. Both declare no internal adhesive. Their 20 mm supplied-bore entries have different recovered limits:<\/p>\n<table>\n<thead>\n<tr>\n<th>Campo publicado<\/th>\n<th>3:1 single wall<\/th>\n<th>4:1 single wall<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Size entry<\/td>\n<td>20.0\/6.7 mm<\/td>\n<td>20.0\/5.0 mm<\/td>\n<\/tr>\n<tr>\n<td>Minimum supplied ID<\/td>\n<td>20.0 mm<\/td>\n<td>\u226520.0 mm<\/td>\n<\/tr>\n<tr>\n<td>Maximum ID after recovery<\/td>\n<td>6.7 mm<\/td>\n<td>\u22645.0 mm<\/td>\n<\/tr>\n<tr>\n<td>Adhesivo interno<\/td>\n<td>Ninguno<\/td>\n<td>Ninguno<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>These are manufacturer declarations from the respective dimension tables, checked 9 October 2026. The 3:1 page establishes minimum and maximum through its column headings; the 4:1 page also prints the inequalities in each row.<\/p>\n<p>For hypothetical <strong>18 mm pass-over and 6 mm landing<\/strong> dimensions, both supplied minima clear the large feature. The 3:1 row&#8217;s 6.7 mm recovered maximum does not establish contraction below 6 mm; the 4:1 row&#8217;s 5.0 mm maximum does. That makes the latter a dimensional candidate, still subject to allowance and application review. It does not prove a sealed joint.<\/p>\n<p>Keep the published 6.7 mm limit. Replacing it with 20 \u00f7 3 would substitute nominal arithmetic for the actual declaration.<\/p>\n<h2>Check construction and duty alongside the ratio<\/h2>\n<p>The unlined 4:1 example shows why ratio cannot identify adhesive. Where a bonded interface is required, select an appropriate lined product and assess compatibility, contact geometry and sealing evidence. Use the <a href=\"https:\/\/yocl.com\/es\/single-wall-vs-dual-wall-heat-shrink-tubing\/\">comparaci\u00f3n de pared simple frente a pared doble<\/a> for that decision.<\/p>\n<p>Compare actual wall fields and their measurement states rather than assuming 4:1 is thicker or stronger. Also check coverage and declared longitudinal change, permitted recovery conditions, service temperature, electrical duty and required environmental evidence for the exact grade. Diameter ratio supplies none of those values.<\/p>\n<p>A tight exterior or visible adhesive at an end cannot by itself verify the complete sealing interface. If an installed sleeve is already loose, damaged or has an unverified seal, the <a href=\"https:\/\/yocl.com\/es\/why-heat-shrink-tubing-splits-or-fails-to-seal\/\">heat-shrink failure guide<\/a> addresses that separate investigation.<\/p>\n<h2>Make the final choice from the products that pass<\/h2>\n<p>Keep 2:1 in consideration when its exact size meets both fit checks and the required function. Move to 3:1 or 4:1 when their documented recovery range solves a transition the lower-ratio candidate cannot cover. If several products pass, compare their construction, installed space, process and duty. If none passes, revise the exact size or connection arrangement instead of assuming extra heat will deliver extra recovery.<\/p>\n<p>For a YOCL size review, provide the largest pass-over dimension, smallest landing dimension, required coverage, jacket material and intended duty through the <a href=\"https:\/\/yocl.com\/es\/heat-shrink-tubing-manufacturer\/#range\">gama de productos de tubo termorretr\u00e1ctil<\/a>. Request the matching size limits, permitted application range and installation information so the final selection identifies a product and size, not just \u201c4:1 heat shrink.\u201d<\/p>\n<h2>Referencias<\/h2>\n<ul>\n<li>Centro Espacial Kennedy de la NASA \u2014 <a href=\"https:\/\/standards.nasa.gov\/sites\/default\/files\/standards\/KSC\/F\/KSC-E-165-REV-F.pdf\" target=\"_blank\" rel=\"noopener\">KSC-E-165 Revision F, 20 December 2021<\/a>, <em>Electrical Ground Support Equipment Fabrication, Specification for<\/em>. \u00a73.8.1.1.1(a), printed page 59; scoped expanded\/recovered size principle.<\/li>\n<li>Informaci\u00f3n del producto YOCL \u2014 <a href=\"https:\/\/yocl.com\/es\/product\/3-1-zero-halogen-single-wall-heat-shrink-tubing\/\">3:1 Tubo termorretr\u00e1ctil de pared simple sin hal\u00f3genos<\/a>. 20.0\/6.7 mm row, dimension headings and absence of adhesive; checked 9 October 2026.<\/li>\n<li>Informaci\u00f3n del producto YOCL \u2014 <a href=\"https:\/\/yocl.com\/es\/product\/4-1-zero-halogen-single-wall-heat-shrink-tubing\/\">4:1 Tubo termorretr\u00e1ctil de pared simple sin hal\u00f3genos<\/a>. 20.0\/5.0 mm row, supplied\/recovered bounds and absence of adhesive; checked 9 October 2026.<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Choose the shrink ratio from the diameter transition the tubing must bridge. Its supplied bore must clear the largest feature, and its freely recovered bore must be smaller than the narrowest surface it needs to grip. A suitable 2:1 size can already complete that job. Consider 3:1 or 4:1 when the actual dimensions require a [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":3075,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[165],"tags":[],"class_list":["post-3076","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-heat-shrink-insulation"],"_links":{"self":[{"href":"https:\/\/yocl.com\/es\/wp-json\/wp\/v2\/posts\/3076","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/yocl.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/yocl.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/yocl.com\/es\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/yocl.com\/es\/wp-json\/wp\/v2\/comments?post=3076"}],"version-history":[{"count":1,"href":"https:\/\/yocl.com\/es\/wp-json\/wp\/v2\/posts\/3076\/revisions"}],"predecessor-version":[{"id":3077,"href":"https:\/\/yocl.com\/es\/wp-json\/wp\/v2\/posts\/3076\/revisions\/3077"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/yocl.com\/es\/wp-json\/wp\/v2\/media\/3075"}],"wp:attachment":[{"href":"https:\/\/yocl.com\/es\/wp-json\/wp\/v2\/media?parent=3076"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yocl.com\/es\/wp-json\/wp\/v2\/categories?post=3076"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yocl.com\/es\/wp-json\/wp\/v2\/tags?post=3076"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}