Please note: it is important to check that any alternative product is suitable for your requirements, as our suggestion is given in good faith but without warranty. If you are in any doubt please first contact our technical team on 0113 2455450 (option 2) or send a message to [email protected] where we will be happy to discuss your project.
PPG Sigma Etch, a phosphoric acid-based etch solution for treating new, unweathered galvanized surfaces, where blasting or abrasion is not possible, prior to painting.
Changes colour on application from blue to black to indicate the effectiveness of primary pre-treatment
Meets the requirements of British Rail`s `T-wash` solution
May be overcoated with a wide range of protective coating systems
May be used to give adhesion of high-temperature coatings to new galvanized steel
Not recommended for immersed conditions
Can be overcoated after a minimum of 2 hours - See further below for surface preparation and application instructions
PPG Sigma Etch is a phosphoric acid-based etch solution for treating new, unweathered galvanized surfaces prior to painting. Sigma Etch changes colour on application from blue to black to indicate the effectiveness of primary pre-treatment, and meets the requirements of British Rail's 'T-wash' solution.
Features & Benefits
For pre-treatment of new galvanized steel where blasting or abrasion is not possible
May be overcoated with a wide range of protective coating systems
May be used to give adhesion of high-temperature coatings to new galvanized steel
Changes colour on application from blue to black to indicate the effectiveness of primary pre-treatment
Meets the requirements of British Rail's 'T-wash' solution
Not recommended for immersed conditions
Can be overcoated after a minimum of 2 hours
See further below for surface preparation and application instructions
Reference
Colour
Size
131931
Pale blue solution, which turns grey-black on application
Refer below for more details on preparation and application
Surface Preparation
Recommended Substrate Conditions and Temperatures
Galvanized steel
Galvanized surfaces are variable, and the preferred method of treatment is to lightly sweep blast followed by degreasing and cleaning
Remove all rust, dirt, moisture, grease or other contaminants from the surface
Any traces of soluble zinc salts should be removed by abrading and washing
Washed with fresh water to remove emulsified residues, dirt and other contaminants
Surfaces which following application do not uniformly blacken, indicate insufficient primary surface preparation and these should be re-prepared by abrading
Application
Instructions for Use
Mix thoroughly before application
Over-application will produce a dense black powdery layer which is unsuitable for the application of topcoats
Such areas will require either abrading or washing to remove powdery deposits otherwise the adhesion of topcoats will be adversely affected
Brush/roller
Brush recommended
Apply at 15.0 m²/l (611 ft²/US gal)
Roller is suitable
Recommended thinner
No extra thinner is necessary
Note:
If however application results in a black powdery surface then Sigma Etch can be diluted with tap water
Cleaning Solvent
Tap water
Spreading Rate and Film Thickness
Overcoating interval
Overcoating with...
Interval
10°C (50°F)
20°C (68°F)
30°C (86°F)
40°C (104°F)
Itself
Minimum
2 hours
2 hours
1 hour
30 minutes
Maximum
48 hours
48 hours
48 hours
48 hours
Safety Precautions
This product contains phosphoric acid
Before commencing application refer to Material Safety Data Sheet
Although this is a waterborne paint, care should be taken to avoid inhalation of spray mist, as well as contact between the wet paint and exposed skin or eyes
Customer agrees that before placing an Order, Customer has read and understood the most up to date Product Data Sheet for the Product. Where we have access to the Product Data Sheet from the manufacturer, we will either provide a copy on request, or include a link to the Product Data Sheet available on the manufacturer’s website. Customer further agrees that we have no liability for any errors or omissions contained within the Product Data Sheets. For more information, please see our Terms & Conditions of Sale.
PPG Sigma Etch is only available with the shipping and delivery timescales listed below - please do not contact our Customer Support Team with enquiries about alternative or earlier shipping and delivery times.
Saturdays and Sundays, as well as Bank Holidays, are not classed as working days.
Orders placed after the cut-off for this product will not be processed for earliest dispatch until 9am the next working day.
These surface preparation kits for steel have been created to help provide customers with an easily accessible bundle of tools to aid in the preparation of steel surfaces in accordance with ISO 8501-1 (St2/3) and SSPC (SP 2/3). Please click here for important information about these kits. Kit Contents: SET 1 (Hand Tools)1 x Rust-Oleum...