Derogrund 25

Anti rust primer with chromate-free anti-corrosive pigments (zinc-phosphate) on alkyd resin basis

General information
Derogrund 25

Field of application

  • protection against corrosion for steel constructions and cast iron

Product properties

  • Contains zincphosphate
  • Resistance to mineral oils
  • Fast drying
  • Tolerant to a contaminated support
  • Weldable up to 25-30 µm dry film thickness
  • Recoatability: with single-component topcoats

Technical Specification
Derogrund 25

Colours redbrown, grey.
Other colours upon request.
Flash point >23 °C
Temperature stability -20 up to 120 (short-term up to 150) °C
Gloss Mat
Potential dry film thickness in one working process 25 up to 40 µm
Viscosity Appr. 30 sec running time (DIN 4 mm pot)
Density in kg/l 1,3
Solid content in % 60
Solid volume in % 41
Theoretical spreading capacity
  • 13,67 m²/l at 30 µm DFT
  • 10,52 m²/kg at 30 µm DFT
Recommended film thickness 75 µm WFT corresponds to 30 µm DFT
Drying (DIN EN ISO 1517) 30 µm DFT
Dust-dry (Tg1) After 25 min
Touch-dry (Tg4) After 40 min
Dry (Tg6) After 4 h
Accelerated drying 30 min. at 60°C possible, after 10 min. flash-off time
Interval for overcoating
  • after 2 h with single-component topcoats

Note

  • The specifications are based on standard atmospheric conditions 23/50, DIN 50014.
  • Lower temperatures and/or higher humidity will prolong drying and hardening.

Safety information
Derogrund 25

(See Security Data Sheet)

VOC-level Appr. 520 g/l
Solvent content Appr. 40 % by weight
Aromatic content Appr. 40 % by weight

Storage
Derogrund 25

Storage

  • In dry, cool rooms, if possible frost-proof
  • Ensure good ventilation

Shelf life

  • 6 month from date of delivery when in unopened original containers in cool and dry conditions

Application methods
Derogrund 25

Airless spraying

  • Flow pressure 150 - 180 bar
  • Nozzle size 0,009 inch (0,23 mm)
  • Spraying angle according to the geometry and size of the object to be laquered

Compressed air spraying

  • Can be applied as delivered
  • Spraying pressure 3 - 5 bar
  • Nozzle size 1,3 - 1,5 mm

Electrostatic application

  • Application is possible, provided that the material is set to the appropriate conductance for the system concerned
  • It should be noted that,adapting the material to the appropriate conductance for the system concerned,may prolong drying and impair the resistance to corrosion and weathering

Dipping

  • Can not be applied as delivered
  • Use Dero-Tauchgrund ST

Other methods

  • Roller and brush application for repair work is possible

Thinner

  • Max. 5% Derozink-Verdünnung

Cleaning

  • Rinse immediately with Derozink-Verdünnung
  • Residues are dissolvable with Derozink-Verdünnung

Preparation of support

  • Shot blasting to a purity according to SA 2½
  • If necessary clean with high pressure-cleaner and turbo-cleaner-solution
  • Mill scale, welding residues, dust and dirt on the surface which might reduce adhesion have to be carefully and thoroughly removed

General remarks

  • During coating and drying the humidity should be min. 10 % / max. 85 %
  • During coating and drying the environmental temperature should be min. 5°C / max. 30°C
  • Object temperature at least 3° C above dew point.

Example for a system

  • Primer coat: Derogrund 25
  • Finish coat: Deritex EE 30 MS

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The general information and descriptions contained in this specification are provided to the best of our knowledge. Our information and specifications do not constitute warranted characteristics in the legal sense. Any advice for preparation and application which may be provided verbally, in writing or by means of experiments is of general nature only, and any property rights of third parties are also to be regarded in this context. Our general instructions do not release you from your obligation to check the suitability of the products supplied by our company for the intended methods and purposes of application. Particular in those cases when our supplied material will be applied with products from other sources. The products are prepared, applied and used outside of our sphere of control and thus fall solely within the user´s scope of responsibility.
Our general terms of sale and delivery apply as agreed.

Quick access to product information.

Dr. Demuth Derisol Lackfarben GmbH & Co. KG

Hillerser Straße 8, 37154 Northeim
Telefon +49 5551 / 97940
Telefax +49 5551 / 979430

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