El PPS y el PEI ocupan un terreno similar sobre el papel. Ambos soportan 200 C y m\u00e1s, ambos se suministran en placa y barra y ambos tienen buena estabilidad dimensional. La elecci\u00f3n suele decidirse por la qu\u00edmica, y los dos no se comportan igual.<\/p>\n\n
El PPS es el m\u00e1s resistente a los productos qu\u00edmicos de los dos, en particular frente a \u00e1cidos fuertes, bases e hidrocarburos a temperatura elevada. Tambi\u00e9n es ign\u00edfugo de forma intr\u00ednseca, sin aditivos, y absorbe muy poca humedad: menos del 0,05 por ciento, y por eso mantiene las dimensiones en servicio h\u00famedo o sumergido. La contrapartida es la fragilidad: el PPS sin carga es sensible a las entallas y el PPS con fibra de vidrio lo es a\u00fan m\u00e1s. Dise\u00f1e los radios con holgura.<\/p>\n\n
El PEI tiene una resistencia al impacto notablemente mejor y mejores propiedades el\u00e9ctricas en alta frecuencia, y por eso domina en componentes de RF y microondas y en aislamiento el\u00e9ctrico estructural. Su punto d\u00e9bil es la hidr\u00f3lisis. El PEI no tolera la exposici\u00f3n prolongada al agua caliente ni al vapor, y lo atacan los disolventes parcialmente halogenados y algunos \u00e1lcalis fuertes. Si el entorno incluye esterilizaci\u00f3n con vapor, el PEI es la respuesta equivocada, independientemente de su clasificaci\u00f3n t\u00e9rmica.<\/p>\n\n","protected":false},"excerpt":{"rendered":"
Ambos son materiales de m\u00e1s de 200 C con firmes promesas de resistencia qu\u00edmica. Frente a medios reales a temperaturas reales, divergen de forma acusada.<\/p>\n","protected":false},"author":193679612,"featured_media":131,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","advanced_seo_description":"PPS or PEI is decided by the chemistry, not the datasheet. How to match the polymer to the fluids and temperatures in service.","jetpack_seo_html_title":"PPS or PEI: Matching Polymer to Chemistry | Top Plastic","jetpack_seo_noindex":false,"jetpack_seo_schema_type":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_wpcom_ai_launchpad_first_post":false,"_jetpack_feature_clip_id":0,"_jetpack_hide_featured_image":false,"_jetpack_featured_image_duplicate_dismissed":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[132592],"tags":[132586],"class_list":["post-130","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-material-guide","tag-material-guide"],"jetpack_publicize_connections":[],"jetpack_likes_enabled":true,"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/pcp8Cz-26","jetpack-related-posts":[{"id":166,"url":"https:\/\/cntopplastics.com\/es\/milling-glass-filled-grades\/","url_meta":{"origin":130,"position":0},"title":"Mecanizar grados con 30 por ciento de fibra de vidrio sin destrozar la herramienta","author":"jessemei","date":"2026-01-29","format":false,"excerpt":"Glass-filled PPS, PEI and PA66 are abrasive enough to take the edge off carbide in minutes. The tool path, not the tool grade, is the biggest lever.","rel":"","context":"En \u00abMachining\u00bb","block_context":{"text":"Machining","link":"https:\/\/cntopplastics.com\/es\/category\/machining\/"},"img":{"alt_text":"Machining 30 percent glass-filled grades without wrecking the tool","src":"https:\/\/i0.wp.com\/cntopplastics.com\/wp-content\/uploads\/2026\/10\/n-milling-glass-filled-grades.jpg?fit=1000%2C1000&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/cntopplastics.com\/wp-content\/uploads\/2026\/10\/n-milling-glass-filled-grades.jpg?fit=1000%2C1000&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/cntopplastics.com\/wp-content\/uploads\/2026\/10\/n-milling-glass-filled-grades.jpg?fit=1000%2C1000&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/cntopplastics.com\/wp-content\/uploads\/2026\/10\/n-milling-glass-filled-grades.jpg?fit=1000%2C1000&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":172,"url":"https:\/\/cntopplastics.com\/es\/oil-gas-seal-components\/","url_meta":{"origin":130,"position":1},"title":"Materiales para juntas de estanqueidad y anillos de respaldo en petr\u00f3leo y gas","author":"jessemei","date":"2025-12-25","format":false,"excerpt":"High pressure, rapid gas decompression and sour service eliminate most polymers immediately. What survives, and what to specify.","rel":"","context":"En \u00abIndustry Applications\u00bb","block_context":{"text":"Industry Applications","link":"https:\/\/cntopplastics.com\/es\/category\/industry-applications\/"},"img":{"alt_text":"Seal and back-up ring materials for oil and gas","src":"https:\/\/i0.wp.com\/cntopplastics.com\/wp-content\/uploads\/2026\/10\/n-oil-gas-seal-components.jpg?fit=1000%2C1000&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/cntopplastics.com\/wp-content\/uploads\/2026\/10\/n-oil-gas-seal-components.jpg?fit=1000%2C1000&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/cntopplastics.com\/wp-content\/uploads\/2026\/10\/n-oil-gas-seal-components.jpg?fit=1000%2C1000&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/cntopplastics.com\/wp-content\/uploads\/2026\/10\/n-oil-gas-seal-components.jpg?fit=1000%2C1000&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":134,"url":"https:\/\/cntopplastics.com\/es\/temperature-classes-explained\/","url_meta":{"origin":130,"position":2},"title":"Las cuatro clases de temperatura de los pl\u00e1sticos t\u00e9cnicos, explicadas","author":"jessemei","date":"2026-05-21","format":false,"excerpt":"Below 65 C, 65 to 120, 120 to 230, above 230. Sorting materials this way is not academic \u2014 it is how you decide where the specification floor sits.","rel":"","context":"En \u00abMaterial Guide\u00bb","block_context":{"text":"Material Guide","link":"https:\/\/cntopplastics.com\/es\/category\/material-guide\/"},"img":{"alt_text":"The four temperature classes of engineering plastics, explained","src":"https:\/\/i0.wp.com\/cntopplastics.com\/wp-content\/uploads\/2026\/10\/n-temperature-classes-explained.jpg?fit=1000%2C1000&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/cntopplastics.com\/wp-content\/uploads\/2026\/10\/n-temperature-classes-explained.jpg?fit=1000%2C1000&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/cntopplastics.com\/wp-content\/uploads\/2026\/10\/n-temperature-classes-explained.jpg?fit=1000%2C1000&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/cntopplastics.com\/wp-content\/uploads\/2026\/10\/n-temperature-classes-explained.jpg?fit=1000%2C1000&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":96,"url":"https:\/\/cntopplastics.com\/es\/peek-vs-pei-which-high-temp\/","url_meta":{"origin":130,"position":3},"title":"\u00bfPEEK o PEI? C\u00f3mo elegir entre los dos pl\u00e1sticos de alta temperatura m\u00e1s utilizados","author":"jessemei","date":"2026-09-24","format":false,"excerpt":"Both run above 170 C. PEI costs a third of PEEK. Here is where PEI is genuinely the better part and where it quietly fails.","rel":"","context":"En \u00abMaterial Guide\u00bb","block_context":{"text":"Material Guide","link":"https:\/\/cntopplastics.com\/es\/category\/material-guide\/"},"img":{"alt_text":"PEEK or PEI? 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Here is how to run the comparison properly, including the downtime maths most buyers forget.","rel":"","context":"En \u00abMaterial Guide\u00bb","block_context":{"text":"Material Guide","link":"https:\/\/cntopplastics.com\/es\/category\/material-guide\/"},"img":{"alt_text":"PEEK vs POM: when is the expensive material actually cheaper?","src":"https:\/\/i0.wp.com\/cntopplastics.com\/wp-content\/uploads\/2026\/10\/n-peek-vs-pom-cost.jpg?fit=1000%2C1000&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/cntopplastics.com\/wp-content\/uploads\/2026\/10\/n-peek-vs-pom-cost.jpg?fit=1000%2C1000&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/cntopplastics.com\/wp-content\/uploads\/2026\/10\/n-peek-vs-pom-cost.jpg?fit=1000%2C1000&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/cntopplastics.com\/wp-content\/uploads\/2026\/10\/n-peek-vs-pom-cost.jpg?fit=1000%2C1000&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":104,"url":"https:\/\/cntopplastics.com\/es\/semiconductor-esd-fixtures\/","url_meta":{"origin":130,"position":5},"title":"Utillajes ESD para pruebas de semiconductores: materiales que superan la cualificaci\u00f3n","author":"jessemei","date":"2026-09-03","format":false,"excerpt":"Test sockets and wafer-handling fixtures fail qualification for three reasons \u2014 resistivity drift, outgassing and particulate. 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