{"id":1660,"date":"2026-02-16T15:17:10","date_gmt":"2026-02-16T13:17:10","guid":{"rendered":"https:\/\/parmelgomma.ro\/formulation-of-elastomeric-materials-for-applications-in-contact-with-hydrotreated-vegetable-oils-hvo-requirements-and-constraints-in-extrusion-and-molding\/"},"modified":"2026-02-16T15:17:10","modified_gmt":"2026-02-16T13:17:10","slug":"formulation-of-elastomeric-materials-for-applications-in-contact-with-hydrotreated-vegetable-oils-hvo-requirements-and-constraints-in-extrusion-and-molding","status":"publish","type":"post","link":"https:\/\/parmelgomma.ro\/en\/formulation-of-elastomeric-materials-for-applications-in-contact-with-hydrotreated-vegetable-oils-hvo-requirements-and-constraints-in-extrusion-and-molding\/","title":{"rendered":"Formulation of elastomeric materials for applications in contact with hydrotreated vegetable oils (HVO): requirements and constraints in extrusion and molding"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">The use of hydrotreated vegetable oils (HVO) as an alternative to conventional mineral fuels and fluids has introduced distinct material requirements for rubber components used in sealing systems, flexible hoses, and extruded profiles. Although HVO are often considered chemically &#8220;benign,&#8221; their interaction with elastomers reveals different degradation mechanisms compared to those associated with conventional mineral oils. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">The approach to formulating elastomeric materials for these applications requires a precise understanding of HVO composition and its effects on the polymer network.<\/span><\/p>\n<p><b>Chemical characteristics of HVO relevant to elastomers<\/b><\/p>\n<p><span style=\"font-weight: 400;\">HVO are obtained through hydrogenation of vegetable oils, resulting in a mixture predominantly of saturated paraffinic hydrocarbons. Unlike FAME-type biodiesel (Fatty Acid Methyl Esters), HVO do not contain polar ester groups. This chemical difference modifies the mechanisms of rubber absorption and swelling.  <\/span><\/p>\n<p><span style=\"font-weight: 400;\">However, the absence of polarity does not eliminate interaction with elastomers. The distribution of chain fractions and the content of additives in HVO can favor plasticizer migration or induce changes in elastic modulus over time. <\/span><\/p>\n<p><b>Limitations of conventional elastomers<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Elastomers frequently used in contact with mineral oils, such as NBR (Nitrile Butadiene Rubber) with medium acrylonitrile content, may exhibit atypical behavior in contact with HVO. In certain formulations, the following are observed: <\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">initially reduced swelling, followed by progressive stiffening;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">extraction of low molecular weight plasticizers;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">variations in sealing properties during repeated thermal cycles.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">These effects indicate that direct extrapolation of performance from mineral oil applications to HVO is technically incorrect.<\/span><\/p>\n<p><b>Formulation directions dedicated to HVO applications<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Elastomeric materials intended for contact with HVO are formulated through simultaneous adjustment of several parameters:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">selection of the base polymer, with emphasis on modified EPDM (Ethylene Propylene Diene Monomer) or HNBR (Hydrogenated Nitrile Butadiene Rubber);<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">use of plasticizers with high stability and low solubility in paraffinic media;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">optimization of the vulcanization system to limit network rearrangements over time.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">In the case of EPDM, chemical resistance is favorable, but compatibility with applications involving high pressures or high temperatures must be evaluated separately. HNBR offers a better compromise between chemical resistance and mechanical performance, with higher technological costs. <\/span><\/p>\n<p><b>Implications for extrusion and molding<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Formulations optimized for HVO can modify processing behavior. In extrusion, the following may be observed: <\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">variations in shear viscosity;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">increased temperature sensitivity;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">need for adjustment of cooling profiles.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">In molding, vulcanization cycles may require longer times or adjusted temperatures to obtain a stable network. Ignoring these effects leads to dimensionally compliant products that are unstable in operation. <\/span><\/p>\n<p><b>Material validation: a critical stage<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Standard tests in mineral oils are not sufficient for validation of materials intended for HVO. Proper evaluation requires: <\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">long-term immersion tests in HVO specific to the application;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">measurement of variations in volume, hardness, and mechanical properties;<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">simulation of actual operating thermal cycles.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Without these stages, the risk of premature degradation remains high, regardless of the theoretical qualifications of the material.<\/span><\/p>\n<p><b>Conclusion<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Rubber materials formulated for applications in contact with hydrotreated vegetable oils represent a distinct category that cannot be addressed through minor adaptations of conventional formulations. Chemical compatibility, long-term stability, and processing behavior must be treated simultaneously. In the absence of dedicated formulation and rigorous validation, the use of elastomers in HVO applications remains a significant source of technical risk.  <\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The use of hydrotreated vegetable oils (HVO) as an alternative to conventional mineral fuels and fluids has introduced distinct material requirements for rubber components used in sealing systems, flexible hoses, and extruded profiles. Although HVO are often considered chemically &#8220;benign,&#8221; their interaction with elastomers reveals different degradation mechanisms compared to those associated with conventional mineral [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":1661,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[25],"tags":[],"class_list":["post-1660","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-parmel-gomma"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>HVO elastomers for extrusion and molding | Parmel Gomma<\/title>\n<meta name=\"description\" content=\"HVO elastomers \u2014 real requirements for extrusion and molding: degradation mechanisms, selection of EPDM or HNBR, proper validation through immersion tests.\" \/>\n<meta name=\"robots\" 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