Antibacterial , Antiviral Highly Conc. ( W50) Water Based Paste of NanoSilver

Anti allergic, non toxic antibacterial and fungicidal additive for film-forming substrates like paints, coatings, resins, polymers and other dispersions as well as for the production of monomeric resin solutions and masterbatches.

agpure® W50 is a highly concentrated, highly viscous silver nanoparticle dispersion for the antimicrobial functionalization of surfaces and bulk materials. Due to the high surface to volume ratio of nanoparticles only low levels of metallic silver are necessary for a high and long lasting antimicrobial
performance. The biocidal effect of agpure® W50 is based on the controlled release of silver ions.

agpure® W50 is highly recommended for aqueous and non aqueous products as well as for solid products. For other product forms special agpure®
types are available.

Antibacterial polymers. Antimicrobial masterbatches. Fibers, yarns and thermoplastic products. Non sensitizing, permanent active fungicidal paints,
coatings, polymers and plaster. Antibacterial varnishes, coatings and materials in hygienic applications in medicine, agriculture, food processing
and -handling, water treatment, air ducts, public areas, the textile industry and in the sanitary sector.

Antibacterial resins and silicones for food contact and skin contact applications.
Sealings, sealants and piping that are resistant against microbial settling. Coatings for food contact packaging paper and polymers.
Medical coatings of implants, bone cement and antiseptic wound covers.

Antimicrobial glass or ceramic equipment. Antimicrobial treatments in agriculture, food processing and infection control areas.


Products properly equipped with antimicrobial agpure® W50 are non-toxic to humans and animals. In contrast to other biocides agpure® W50 is non sensitizing and non allergic to humans in skin contact. Due to the slow and controlled release of biocidal silver-ions from agpure® W50 the antimicrobial effect is persistent. Products containing agpure® W50 can be protected against microbial soiling for a lifetime without being toxic to humans or the environment.

agpure® W50 exhibits strong activity against all gram-positive and gram-negative bacteria. Its activity is unaffected by antibiotic-resistance of strains, yeast and fungi. So agpure® W50 is a valuable mean fighting multiresistent germs in hospitals, surgeries, agriculture and in food processing. agpure® W50 itself does not induce or propagate bacterial resistance.

agpure® W50 silver nanoparticles exhibit a yellow colour due to the plasmon effect. Please consider possible influences on product colour. For applications that are very sensitive for even slight colour changes there are special agpure® product forms available. Ask our experts. agpure® W50 is free of any inorganic fillers. It can be used for very small structures like microfibers or for very thin coatings.


Appearance: dark brown/ black honey
Available container sizes: 0,5 kg, 1 kg
Silver concentration 45,0 ± 1,50 %wt.
pH-value 7,0 – 9,0
Highly viscous nanoparticle dispersion
Water content < 5 %
Density 2,7 kg/dm3
Colour dark brown
Mean silver particle size 15 nm
d99 (99% silver particles smaller as) 20 nm
Stability (dark, cool storage) > 12 months

agpure® W50 is miscible with water at any ratio. Precipitation or agglomeration will not occur with pure water. Such dispersions show excellent
stability. In case of addition of other solvents, salts or solids, agglomeration might occur. Preliminary tests are recommended to assess compatibilities with other components. agpure® W50 has a negative zeta potential.

Dispersing agpure® W50

Please keep to the following instructions to handle agpure® W50 properly:

  • Don’t use saturated or highly concentrated saline solutions.
  • Dispersions will not stable at pH-values below 4.
  • Mix vigorously; the use of dispersing
    instruments (e.g. ULTRA-TURRAX®) is recommended if the dispersion is not satisfying.
    A small amount of clumping and/or settling during shipping and storage might occur. Shaking by hand is usually enough to redisperse particles within the dispersion.