Cited by 327Natural Fiber Reinforced CompositesDyeing and Modifying Textile FibersFiber-reinforced polymer composites

Industrial Hemp Fibers: An Overview

Open access
Manaia, João P., Manaia, Ana T., Rodriges, Lúcia·2019·Fibers

Abstract

Industrial hemp (Cannabis sativa) is one of the most available and widely produced bast fibers with high cellulose content. Interest in these fibers is warranted due to environmental protection challenges as well as their inherent properties such as low density, high specific strength, and stiffness. In addition, advanced research and progress have gone into increasing their mechanical performance through surface treatments and in the development of new materials. The most promising application for hemp fibers is as reinforcement in polymeric composites or through hybridization. Nonetheless, more research is needed to improve their properties and expand their range of applications. The biodegradability issue is one problem that must be addressed when considering long life-cycle applications as the reproducibility of these composites’ final properties. This review is a comprehensive literature review on hemp fibers. It includes hemp fibers’ chemical and mechanical properties, surface modifications, hybrid composites, as well as current and future applications.

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Crossref · 10.3390/fib7120106

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  • Bast fiber is composed of 70% to 75% cellulose, 15% to 20% hemicellulose, 3% to 5% lignin, 0.8% pectin, 2% to 6% extractives, and 1% to 2% ash content.

    “It is composed of 70% to 75% cellulose, 15% to 20% hemicellulose, 3% to 5% lignin, 0.8% pectin, 2% to 6% extractives, and 1% to 2% ash content (Manaia et al. 2019; Möller and Popescu 2009; Zheljazkov et al. 2023).”

    From A critical review of industrial fiber hemp anatomy, agronomic practices, and valorization into sustainable bioproducts (2025) · cites this paper as Manaia et al. 2019

    The Hemp Fiber section gives matching hemicellulose (15–20%) and pectin (0.8%) values, but its cellulose (70–74%) and lignin (3.5–5.7%) ranges differ from the claim. Table 1 lists wax at 1.2–6.2%, not extractives at 2–6%, and ash at 0.8%, not 1–2%. (LLM, conf=0.91)

    Experimental — accuracy not yet measured
  • Hemp bast fibers are regarded as the strongest and longest natural fiber, are cheaper to manufacture, and last far longer than materials such as cotton.

    “Hemp bast fibers are regarded as the strongest and longest natural fiber, and they are cheaper to manufacture, and last far longer than materials such as cotton (Cherney and Small 2016; Manaia et al. 2019; Rehman et al. 2021).”

    From A critical review of industrial fiber hemp anatomy, agronomic practices, and valorization into sustainable bioproducts (2025) · cites this paper as Manaia et al. 2019

    The Hemp Fiber section calls hemp “one of the strongest” natural fibers, and the Conclusions describe it as relatively low-cost. Neither passage establishes that hemp is the strongest or longest natural fiber, cheaper to manufacture than cotton, or longer-lasting than cotton. Page numbers are unavailable in our copy. (LLM, conf=0.88)

    Experimental — accuracy not yet measured

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Research works printed but not linked: 1

  1. Brosius, D. Natural Fiber Composites Slowly Take Root. Compos. Technol. 2006, 12, 32-37.

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Authors
Manaia, J. P., Manaia, A. T., & Rodriges, L.
Affiliations
  • Instituto Pedro Nunes (PT)
  • Centro Tecnológico das Indústrias Têxtil e do Vestuário de Portugal (PT)
Corresponding author
Manaia, João P.
Venue
Fibers
Publisher
MDPI AG
Published
2019-12-02
Volume
7
Issue
12
Pages
106
ISSN
2079-6439 (ISSN-L)
OpenAlex
W2990883936
Cited by
317
References
97
Citations by year
2026: 44 · 2025: 72 · 2024: 68 · 2023: 46 · 2022: 35 · 2021: 38 · 2020: 14
FWCI
9.29
Type
journal article
Language
en
Open access
Locations
Fibers (publishedVersion, cc-by)
Funders
Interreg (SOE2 / P1 / P0524)
Topics
  • Physical Sciences › Materials Science › Polymers and Plastics › Natural Fiber Reinforced Composites
  • Physical Sciences › Engineering › Building and Construction › Dyeing and Modifying Textile Fibers
  • Physical Sciences › Engineering › Mechanical Engineering › Fiber-reinforced polymer composites
Keywords
industrial hemp, Cannabis sativa, bast fibers, cellulose, mechanical properties, surface treatment, hybrid composites, polymer composites, biodegradability, fiber-reinforced composites, environmental protection

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