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CHROMATES
ZINC TETRAOXYCHROMATE TC20
Zinc Chromate tetrahydroxyde ZnCrO4, 4 Zn(OH)2

Description
TC20 is a low dust, yellow powder. This is a stable and non-hygroscopic powder with a low tinting strength, it is easily dispersed.
Technical data

 Nominal
Value
Tolerance
(+/-)
Test
method
Moisture content (%) - 1h at 105°CTyp. 1.0ISO 787/2
Water soluble CrO3 (g/L)Typ. 0.15ISO 1249
Fineness HegmanTyp. 5.5ISO 787/5 - ISO 1524
Fineness NorthTyp. 7ISO 787/5 - ISO 1524
D50 (microns)Typ. 3.5Laser granulometry
Specific GravityTyp. 3.6ISO 787/10
Sieve residue - 45 microns (%)0.05maxISO 787/7
Oil absorption (cm3/100g)355ISO 787/5
Zn as ZnO content (%)68.5minICP
Cr as CrO3 content (%)16.0minICP
Bonded water content (%) - 1h at 320°CTyp. 10Gravimetry
Recommended shelf life : 5 years
Formulators Guidelines

TC20 is recommended for use in all sorts of temporary protection systems. It is particularly recommended for shop primers and wash primers designed for steel and aluminium protection.
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