Guangzhou Eric Wei Chemical Co., Ltd.
Guangzhou Eric Wei Chemical Co., Ltd.

Defros QB20 Preservative

Defros QB20 Preservative is a broad-spectrum, formaldehyde-free biocide from the Defros QB Series, designed for water-based industrial formulations. It effectively controls bacteria, yeast, and mold in paints, adhesives, and coatings while ensuring low toxicity and excellent thermal/chemical stability. Compliant with global regulations including EU BPR and EPA, it offers long-term preservation with minimal odor and no VOC contribution.
  • defros qb20 preservative_63dcdd1f
  • defros qb20 preservative_63dcdd1f

Features Of Defros QB20 Preservative

  1. Broad-spectrum antimicrobial activity against bacteria, yeasts, and molds.

  2. pH-stable performance across a wide range of 3.0–9.0, ensuring compatibility with diverse formulations.

  3. Low volatility and excellent thermal stability for processing at elevated temperatures.

  4. Non-oxidizing chemistry, minimizing risk of corrosion in metal-containing systems.

  5. Eco-friendly profile with readily biodegradable components and low aquatic toxicity.

Typical Applications Of Defros QB20 Preservative

  1. Water-based industrial coatings and architectural paints.

  2. Latex emulsions and polymer dispersions.

  3. Adhesives and sealants for construction and woodworking.

  4. Printing inks and pigment dispersions.

  5. Cleaning formulations including industrial detergents and metalworking fluids.

Specifications Of Defros QB20 Preservative

Chemical TypeIsothiazolinone-based blend (active: 2-methyl-4-isothiazolin-3-one & 5-chloro-2-methyl-4-isothiazolin-3-one)
Product FormClear, amber liquid
AppearanceHomogeneous, free from sediment or cloudiness
Active Content20.0 ± 1.0% w/w (as total isothiazolinones)
pH (1% aqueous solution)2.8 – 3.5
Density (25°C)1.12 – 1.16 g/cm³
SolubilityCompletely miscible with water and common polar organic solvents
Storage Stability≥24 months in unopened original container at 5–25°C


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