PPG Sigma Etch

    7185

    We no longer stock this product, but can recommend Axalta ViterWash T Etch Solution as a great alternative.

    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

    Quantity
    Product not available
    This Product has been Discontinued

    Description

    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

     

    ReferenceColourSize
    131931Pale blue solution, which turns grey-black on application5 litres



    Product Data


    Data for product at 20°C (68°F)
    Number of componentsOne
    Mass density1.0 kg/l (8.3 lb/US gal)
    VOC (Supplied)UK PG 6/23(92) Appendix 3: max. 335.0 g/l (approx. 2.8 lb/US gal)
    Theoretical spreading rate15.0 m²/l for 0 µm ( ft²/US gal for 0.0 mils)
    Overcoating IntervalMinimum: 2 hours
    Maximum: 48 hours
    Shelf lifeAt least 12 months when stored cool and dry

    Notes:

    • 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...Interval10°C (50°F)20°C (68°F)30°C (86°F)40°C (104°F)
    ItselfMinimum2 hours2 hours1 hour30 minutes
    Maximum48 hours48 hours48 hours48 hours



    Safety Precautions


    • This product contains phosphoric acid
    • Before commencing application refer to Material Safety Data Sheet
    • See information sheets 1430, 1431
    • 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



    References


    Product Details
    7185

    Data sheet

    Manufacturer
    PPG
    Water / Solvent Based
    Solvent
    For Use On
    Galvanized steel,
    Application Method
    Brush
    Roller
    Colour
    Standard / Ready Mixed
    Pack Size
    5L
    Solvent
    Phosphoric acid
    Mixing Ratio
    -
    Key Features
    Changes color on application from blue to black to indicate the effectiveness of primary pretreatment
    Touch Dry (at 20°C)
    -
    Dry to Handle (at 20°C)
    -
    Dry to Recoat (at 20°C)
    Minimum: 2 hours. Maximum: 48 hours
    Fully Cured (at 20°C)
    -
    Pot Life (at 20°C)
    -
    Coverage
    15.0 m²/l for 0 µm ( ft²/US gal for 0.0 mils)
    Unit Contents
    -
    Compatible Primers
    -
    Compatible Topcoats
    -
    Max. Application Temperature
    -
    Min. Application Temperature
    -
    Density
    1.0 kg/l (8.3 lb/US gal)
    Solids by Volume
    -
    Heat Resistance (up-to)
    -
    VOC
    UK PG 6/23(92) Appendix 3: max. 335.0 g/l (approx. 2.8 lb/US gal)
    Shelf Life (Once Opened)
    At least 12 months when stored cool and dry
    Attachments
    Download


    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.


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    IMPORTANT SHIPPING & DELIVERY INFORMATION

    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.

    All delivery costs below are excluding VAT


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