25/07/2025

Cashew Nut Shell Liquid (CNSL) is a dark, viscous liquid obtained from the honeycomb structure of cashew nut shells during processing. While the global cashew industry is widely known for edible kernels, CNSL is a lesser-known but highly valuable byproduct used extensively in industrial manufacturing.

🔬 What is CNSL?

CNSL is a natural phenolic liquid that contains a blend of:

  • Anacardic acid (60–70%) – offers acid reactivity and anti-corrosion properties
  • Cardol (15–20%) – contributes to polymer flexibility
  • Cardanol (5–10%) – enhances thermal and chemical resistance
  • Other trace alkenyl phenols

This unique chemical composition makes CNSL an ideal alternative to petroleum-based phenols in multiple industrial formulations.

đŸ§Ș Physical & Chemical Properties

  • Appearance: Dark brown viscous liquid
  • Specific gravity: ~0.95–0.98 at 30°C
  • Acid value: 150–200 mg KOH/g
  • Solubility: Soluble in alcohols, esters, and ketones
  • Stability: Excellent resistance to heat and oxidation

CNSL can undergo polymerization, alkylation, and condensation reactions—offering high adaptability in resin synthesis and additive formulations.

🏭 Applications of CNSL Across Industries

  1. Automotive & Friction Materials  Used in brake linings, clutch facings, and friction dust due to its heat resistance and binding properties.
  2. Paints & Coatings  Ideal for marine coatings, anti-corrosive primers, and epoxy resins.
  3. Adhesives & Sealants  Used as a reactive phenolic resin base in construction, flooring, and heavy-duty adhesives.
  4. Rubber & Plastics  Improves flexibility and performance of vulcanized rubber and thermosetting plastics.
  5. Electronics & Insulation  Applied in laminates, insulating varnishes, and circuit board compounds.

🌍 CNSL’s Green Credentials

  • Bio-based & renewable
  • Derived from agricultural waste (cashew shells)
  • Lower carbon footprint vs fossil-based alternatives
  • Supports sustainable industrial chemistry

📩 Commercial Supply

Vietnam is one of the world’s leading cashew processors, and CNSL is increasingly available in bulk industrial packaging. Suppliers like SVC Cashew offer:

  • Crude or filtered CNSL
  • Export packaging in 200L drums or 1000L IBC tanks
  • Full documentation: COA, MSDS, and OEM/private-label options