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PPG SigmaZinc 158

7558
PPG3933

PPG SigmaZinc 158 is a two-component, moisture-curing zinc (ethyl) silicate anti-corrosive primer for structural steel. When suitably topcoated provides excellent corrosion protection for steel substrates up to 540°C (1000°F).

  • Certificate for ASTM A-490 class `B` for slip coefficient
  • Complies with the compositional requirements of SSPC-Paint 20, Level 2
  • Good low-temperature curing
Colour
Size
Finish
£603.40(incl. VAT)
£502.83(ex. VAT)
Quantity
Please choose your colour
Available for Delivery (See Delivery Options Below)

Description

PPG SigmaZinc 158 is a two-component, moisture-curing zinc (ethyl) silicate anti-corrosive primer for structural steel.  When suitably topcoated provides excellent corrosion protection for steel substrates up to 540°C (1000°F). Complies with the compositional requirements of SSPC-Paint 20, Level 2, PPG SigmaZinc 158 also boasts good impact and abrasion resistance.



Top Features & Benefits


  • Certificate for ASTM A-490 class 'B' for slip coefficient
  • Suitable as a system primer in various paint systems based on unsaponifiable binders
  • Galvanic action eliminates sub-film corrosion
  • Can withstand substrate temperatures from –90°C (–130°F) up to 400°C (750°F), under normal atmospheric exposure conditions
  • Good low-temperature curing
  • Must not be exposed to alkaline (more than pH 9) or acidic (less than pH 5.5) liquids



Preparation & Application


Recommended Substrate Conditions and Temperatures

Immersion Exposure

  • Steel; blast cleaned to ISO-Sa2½, blasting profile 40 – 70 µm (1.6 – 2.8 mils)
  • Steel with approved zinc silicate shop primer; sweep blasted to SPSS-Ss, welds, rusty and damaged areas blast cleaned to ISO-Sa2½

 

Atmospheric Exposure Conditions

  • Steel; blast cleaned to ISO-Sa2½, blasting profile 40 – 70 µm (1.6 – 2.8 mils)
  • Steel with approved zinc silicate shop primer; pre-treated to SPSS-Pt3

 

Substrate Temperature and Application Conditions

Substrate temperature during application and curing down to -5°C (23°F) is acceptable; provided the substrate is free from ice and dry. Substrate temperature during application up to 50°C (122°F) is acceptable. Substrate temperature during application and curing should be at least 3°C (5°F) above dew point. Relative humidity during curing should be above 50%

 

Instructions for Use

Mixing ratio by volume: binder to zinc powder 81:19. Many of PPG's zinc silicates are supplied as two-pack materials consisting of a container with pigmented binder and a drum containing a bag of zinc powder. To ensure proper mixing of both components, the instructions given below must be followed.

To avoid lumps in the paint do not add the binder to the zinc powder.

  1. Take the bag with zinc powder out of the drum
  2. Shake the binder in the jerrycan a few times to reach a certain degree of homogenization
  3. Pour about 2/3 of the binder into the empty drum
  4. With the jerrycan now reduced in weight and containing more free space, shake it vigorously to obtain a homogeneous mix with no deposits left on the bottom, and add this to the drum
  5. Add the zinc powder gradually to the pigmented binder in the drum and, at the same time, continuously stir the mixture by using a mechanical mixer (keep the speed low)
  6. Stir the zinc dust powder thoroughly through the binder (high speed) and keep stirring until a homogeneous mixture is obtained
  7. Strain mixture through a 30 – 60 mesh screen
  8. Agitate continuously during application (low speed). The use of a dedicated pump with a constant agitation for a zinc silicate coating is recommended.

 

Note:
At application temperature above 30°C (86°F) addition of max 10% by volume of THINNER 90-53 may be necessary

 

Induction Time

None

 

Pot Life

12 hours at 20°C (68°F)

 

Air Spray

Recommended thinner: PPG Thinner 90-53

Volume of thinner: 0 - 10%, depending on required thickness and application conditions

Nozzle orifice: 2.0 mm (approx. 0.079 in)

Nozzle pressure: 0.3 MPa (approx. 3 Bar; 44 p.s.i.)

 

Note:
A dedicated pump for a zinc silicate coating with constant agitation must be used.

 

Airless Spray

Recommended thinner: PPG Thinner 90-53

Volume of thinner: 0 - 10%, depending on required thickness and application conditions

Nozzle orifice: Approx. 0.48 – 0.64 mm (0.019 – 0.025 in)

Nozzle pressure: 9.0 - 12.0 MPa (approx. 90 - 120 bar; 1306 - 1741 p.s.i.)

 

Note:
A dedicated pump for a zinc silicate coating with constant agitation must be used.

 

Brush/Roller

Only for touch-up and spot repair. Roller application is not recommended

Recommended thinner: PPG Thinner 90-53

Volume of thinner: 5 – 15%

 

Note:
Apply a visible wet coat with a max. dft of 25 µm (1.0 mils)|same for subsequent coats in order to obtain the required dft.

 

Cleaning Solvent

PPG Thinner 90-53

 

Upgrading

This is only valid for spray application. If the DFT is below specification and an extra coat of SIGMAZINC 158 has to be applied, SIGMAZINC 158 should be thinned down with 25 – 50% PPG Thinner 90-53, in order to obtain a visible wet coat that remains wet for some time.

 

Safety Precautions

For paint and recommended thinners see INFORMATION SHEETS 1430, 1431 and relevant Material Safety Data Sheets. This is a solvent-borne paint and care should be taken to avoid inhalation of spray mist or vapor, as well as contact between the wet paint and exposed skin or eyes.



Product Data


Data for Product at 20°C (68°F)
Number of components Two
Mass density 2.3 kg/l (19.2 lb/US gal)
Volume solids 65 ± 2%
VOC (Supplied) Directive 1999/13/EC, SED: max. 219.0 g/kg. max. 507.0 g/l (approx. 4.2 lb/US gal)
Recommended dry film thickness 75 - 100 µm (3.0 - 4.0 mils) depending on system
Theoretical spreading rate 8.7 m²/l for 75 µm (348 ft²/US gal for 3.0 mils)
Dry to touch 30 minutes
Overcoating interval Minimum: 12 hours. Maximum: Unlimited
Full cure after 12 hours
Shelf life Binder: at least 9 months when stored cool and dry. Pigment: at least 24 months when stored pigment moisture free



Spreading Rate and Film Thickness
DFT Theoretical Spreading Rate
75 µm (3.0 mils) 8.7 m²/l (348 ft²/US gal)
100 µm (4.0 mils) 6.5 m²/l (261 ft²/US gal)



Overcoating interval for DFT up to 100 µm (4.0 mils) and 50% relative humidity
Overcoating with... Interval -5°C (23°F) 0°C (32°F) 10°C (50°F) 20°C (68°F) 30°C (86°F) 40°C (104°F)
Recommended topcoats Minimum
Maximum
24 hours
Unlimited
24 hours
Unlimited
18 hours
Unlimited
12 hours
Unlimited
6 hours
Unlimited
4 hours
Unlimited



Curing time for DFT up to 100 µm (4.0 mils) and 50% relative humidity
Substrate Temp. Dry to Handle Full Cure
-5°C (23°F) 2 hours 24 hours
0°C (32°F) 2 hours 24 hours
10°C (50°F) 1 hours 18 hours
20°C (68°F) 30 minutes 12 hours
30°C (86°F) 30 minutes 6 hours
40°C (104°F) 30 minutes 4 hours



Pot Life (at application viscosity)
Mixed product temp. Pot life
0°C (32°F) 24 hours
10°C (50°F) 16 hours
20°C (68°F) 12 hours
30°C (86°F) 6 hours



References




Product Details
3933-511578

Data sheet

Manufacturer
PPG
Water / Solvent Based
Solvent
For Use On
Steel
Application Method
Spray
Sheen
Flat
Colour
Standard / Ready Mixed
Single, Two or Three Pack
Two-Pack
Pack Size
18.5L
Base Type
Zinc (ethyl) silicate primer
Solvent
-
Mixing Ratio
81:19
Key Features
Certificate for ASTM A-490 class 'B' for slip coefficient, good low-temperature curing, anti-corrosive
Touch Dry (at 20°C)
30 minutes
Dry to Handle (at 20°C)
-
Dry to Recoat (at 20°C)
12 hours
Fully Cured (at 20°C)
12 hours
Pot Life (at 20°C)
12 hours
Coverage
8.7 m²/l for 75 µm (348 ft²/US gal for 3.0 mils)
Recommended Thinner/Cleaner
PPG Thinner 90-53
Unit Contents
-
Compatible Primers
-
Compatible Topcoats
-
Max. Application Temperature
50°C (122°F)
Min. Application Temperature
-5°C (23°F)
Density
2.3 kg/l (19.2 lb/US gal)
Solids by Volume
65 ± 2%
Heat Resistance (up-to)
400°C (750°F)
VOC
Directive 1999/13/EC, SED: max. 219.0 g/kg max. 507.0 g/l (approx. 4.2 lb/US gal)
Shelf Life (Once Opened)
Binder: at least 9 months when stored cool and dry. Pigment: at least 24 months when stored pigment moisture free
UN Number
UN3077, UN1263
Base Type
Zinc (Ethyl) Silicate
Suitable For Use On
Steel
Finish
Flat
Application Method
Spray
Product Usage Type
Primer
Product Range
SigmaZinc
Colour Family
Grey
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 SigmaZinc 158 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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