Hydrogenated Nitrile Butadiene Rubber (HNBR): A Comprehensive Review

Year : 2025 | Volume : 15 | Issue : 02 | Page : 14 22
    By

    Sandeep Rai,

  • Pradeep Uthale,

  1. General Manager R&D, Dyne Chemicals LLP, 3312/18, Chhatral GIDC, Phase-IV, Taluka – Kalol, District – Gandhinagar, Gujarat, India
  2. Application Manger, Dyne Chemicals LLP, 3312/18, Chhatral GIDC, Phase-IV, Taluka – Kalol, District – Gandhinagar,, Gujarat, India

Abstract

HNBR is produced by the hydrogenation of nitrile rubber (NBR) using either a homogeneous or heterogeneous technique. NBR is a copolymer of butadiene and acrylonitrile monomers. The hydrogenation process involves adding hydrogen to the nitrile butadiene copolymer, which results in improved resistance to heat, oxidation, and chemicals compared to NBR. This process alters the molecular structure of the rubber, providing it with superior properties compared to its unmodified counterpart, NBR. Due to hydrogenation, the number of double bonds in NBR is reduced, and the polymer backbone becomes more stable, exhibiting enhanced performance properties in HNBR. HNBR possesses good resistance to heat and oil products. Because of these superior properties, Hydrogenated Nitrile Butadiene Rubber (HNBR) has found extensive applications across various industries such as automotive (engine seals, hoses), oil & gas (seals), aerospace (seals), medical (medical devices), and food processing (seals). Its exceptional properties include high thermal stability, chemical resistance, and mechanical strength. This article presents a comprehensive overview of HNBR, discussing its synthesis, properties, applications, and future prospects. It also explores the unique and superior characteristics that distinguish HNBR from other rubbers, making it more versatile and suitable for high-end engineering applications. The chemistry of manufacturing, along with a brief description of HNBR production via emulsion NBR and solution NBR techniques, is also presented. Due to its unique and superior properties, HNBR is projected to witness massive growth in the future, with increased usage in various high-performance applications, including the automotive, oil & gas, and industrial sectors.

Keywords: Nitrile butadiene rubber (NBR), hydrogenated nitrile butadiene rubber (HNBR), hydrogenation, automotive application, aerospace application

[This article belongs to Journal of Materials & Metallurgical Engineering ]

How to cite this article:
Sandeep Rai, Pradeep Uthale. Hydrogenated Nitrile Butadiene Rubber (HNBR): A Comprehensive Review. Journal of Materials & Metallurgical Engineering. 2025; 15(02):14-22.
How to cite this URL:
Sandeep Rai, Pradeep Uthale. Hydrogenated Nitrile Butadiene Rubber (HNBR): A Comprehensive Review. Journal of Materials & Metallurgical Engineering. 2025; 15(02):14-22. Available from: https://journals.stmjournals.com/jomme/article=2025/view=233433


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Regular Issue Subscription Original Research
Volume 15
Issue 02
Received 04/03/2025
Accepted 19/03/2025
Published 10/04/2025
Publication Time 37 Days
248

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