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Shreebond BU-21 – Butylated Urea Formaldehyde Resin for Hard Film and Fast-Curing Coatings

Shreebond BU-21 – Butylated Urea Formaldehyde Resin for Hard Film and Fast-Curing Coatings

SHREEBOND BU-21 is a butylated urea formaldehyde resin developed for thermosetting coatings that need fast cure, hard films, and durable finishes. It is well-suited for metal primers, coil coatings, can lacquers, and industrial paints where gloss, film toughness, and cost-efficiency are key.

BU-21 integrates easily into most systems based on alkyds, acrylics, and saturated polyesters, and works especially well in low-VOC, high-solids coatings.

Technical Specifications

  • Appearance: Clear to pale yellow liquid

  • Non-Volatile Content: 58 ± 2%

  • Viscosity @ 25°C: 250–500 cps

  • Free Formaldehyde: ≤0.8%

  • Specific Gravity @ 25°C: ~1.10 g/cm³

  • Solubility: Alcohols, esters, ketones, aromatics

  • Shelf Life: 12 months in sealed packaging under ambient storage


Key Benefits

  • Provides high surface hardness and chemical resistance

  • Fast-curing – ideal for high-speed production lines

  • Smooth film flow and gloss retention

  • Compatible with major binder systems

  • Performs well in clear and pigmented coatings


Applications

  • Coil Coatings

  • Can Coatings and Drum Linings

  • Metal Primers and Industrial Basecoats

  • Decorative Industrial Finishes

  • Protective Coatings for Metal Surfaces

Recommended use level: 10–25% by weight, depending on formulation.


Packaging

  • 200 kg MS or HDPE drums

  • IBC totes / ISO tanks available

  • Export-ready packaging on request


Why Choose Shreebond BU-21?
Shreebond BU-21 hits that sweet spot between performance and practicality. It gives coatings the speed, hardness, and chemical durability they need—without overcomplicating your formula or inflating your budget.