PPG Sigma Etch

7185
PPG3987

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

Colour
Size
£39.81
£47.78 Incl. VAT
Quantity
Please choose your colour
Available for Delivery (See Delivery Options Below)

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

 

Reference Colour Size
131931 Pale blue solution, which turns grey-black on application 5 litres



Product Data


Data for product at 20°C (68°F)
Number of components One
Mass density 1.0 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 rate 15.0 m²/l for 0 µm ( ft²/US gal for 0.0 mils)
Overcoating Interval Minimum: 2 hours
Maximum: 48 hours
Shelf life At 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... 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
  • 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
Single, Two or Three Pack
Single
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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