PPG Dimetcote 9

283467

PPG Dimetcote 9 (also known as Sigmazinc 9), is a two-component, moisture-curing zinc (ethyl) silicate coating for structural steel that can withstand substrate temperatures from –90°C (–130°F) up to 400°C (750°F), with good resistance to impact and abrasion.

  • Anti-corrosive primer for structural steel.
  • Specified for structural joints according to ASTM A325 or A490 Bolts RCSC specification, Class B
  • Complies with the compositional requirements of SSPC-Paint 20, Level 1
  • Used on Adelaide Oval Cricket Ground, Riverbank Stand, Adelaide, South Australia
Colour
Size
Finish
£270.50
VAT excluded

£324.60 Tax incl.
Quantity

Description

PPG Dimetcote 9 (also known as Sigmazinc 9) is a two-component, moisture-curing zinc (ethyl) silicate coating for structural steel. Under normal atmospheric conditions, Dimetcote 9 can withstand substrate temperatures from –90°C (–130°F) up to 400°C (750°F). As an anti-corrosive primer for structural steel, Dimetcote 9 also offers good impact and abrasion resistance .

Although the use of a brush to apply Dimetcote 9 is recommended only for touch-up and spot repair, Dimetcote should be appled by air or airless spray.

Must not be exposed to alkaline (more than pH 9) or acidic (less than pH 5.5) liquids.

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.



Top Features & Benefits


  • Suitable as a system primer in various paint systems based on unsaponifiable binders
  • When suitably topcoated provides excellent corrosion protection for steel substrates up to 540°C (1000°F)
  • Good low-temperature curing
  • Good impact and abrasion resistance
  • Specified for structural joints according to ASTM A325 or A490 Bolts RCSC specification, Class B
  • Complies with the compositional requirements of SSPC-Paint 20, Level 1
  • Flat Finish
  • Used on Adelaide Oval Cricket Ground, Riverbank Stand, Adelaide, South Australia

Reference Colour Size Gloss Level
283467 Grey 10 litres Flat



Product Data


Data for Mixed Product at 20°C (68°F)
Mass density 2.4 kg/l (20.0 lb/US gal)
Volume solids 63 ± 3%
VOC (Supplied) Directive 1999/13/EC, SED: max. 221.0 g/kg
UK PG 6/23(92) Appendix 3: max. 480.0 g/l (approx. 4.0 lb/US gal)
Recommended dry film thickness 50 - 100 µm (2.0 - 4.0 mils) depending on system
Theoretical spreading rate 8.4 m²/l for 75 µm (337 ft²/US gal for 3.0 mils)
Dry to touch 15 minutes
Overcoating Interval Minimum: 24 hours
Full cure after 46 hours



Preparation & Application


Recommended Substrate Conditions & 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
  • Existing pipelines may have to be cleaned first by scraper pigs and solvents

 

Atmospheric Exposure Conditions

  • Steel; blast cleaned to ISO-Sa2½ or minimum SSPC SP-6, blasting profile 40 – 70 µm (1.6 – 2.8 mils)
  • Steel with approved zinc silicate shop primer; pretreated to SPSS-Pt3

 

Substrate Temperature & Application Conditions

  • Substrate temperature during application and curing down to -18°C (0°F) is acceptable; provided the substrate is free from ice and dry
  • Substrate temperature during application up to 55°C (131°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 77:23.

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

 

Air Spray


Recommended thinners

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

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

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


 

Upgrading

  • This is only valid for spray application
  • If the DFT is below specification and an extra coat of DIMETCOTE 9 / SIGMAZINC 9 has to be applied, it should be thinned down with 25 – 50% THINNER 90-53, in order to obtain a visible wet coat that remains wet for some time



Additional Data


Spreading rate and film thickness
DFT Theoretical spreading rate
75 µm (3.0 mils) 8.4 m²/l (337 ft²/US gal)
100 µm (4.0 mils) 6.3 m²/l (253 ft²/US gal)
125 µm (5.0 mils) 5.0 m²/l (202 ft²/US gal)

 

Notes:

  • Maximum DFT when brushing: 35 µm (1.4 mils)
  • Above 150 µm (6.0 mils) mudcracking can occur
  • Highly pigmented zinc silicate primers produce dry films with void spaces in between the particles

 

Overcoating interval for DFT up to 100 µm (4.0 mils)
Overcoating with... Interval 0°C (32°F) 10°C (50°F) 20°C (68°F) 30°C (86°F)
recommended topcoats Minimum 48 hours 36 hours 24 hours 18 hours

 

Notes:

  • For recoating with itself to take required dft, recommend to apply within 2 days before full cure. No minimum recoating interval limitation for itself.
  • To confirm cure to topcoat, conduct a MEK rub test per ASTM D4752. A rating of 4 or higher is sufficient for topcoating
  • For measuring of the curing, the MEK rub test according to ASTM 4752 is a suitable method: after 50 double rubs with a cloth soaked in MEK (or alternatively THINNER 90-53) no dissolving of the coating should be observed
  • Curing/recoating time will be shortened by the increase of humidity, please contact regional technical service team for details
  • A mist coat / full coating application technique is required when topcoating to prevent application bubbling. Ensure dry spray is removed from the surface
  • DIMETCOTE 9 / SIGMAZINC 9 is a moisture curing zinc silicate, this means that it only cures after sufficient take up of water from the atmosphere during and after application; it is recommended that relative humidity and temperature are measured during the curing time
  • When curing conditions are unfavorable or when reduced overcoat times are desired, curing can be accelerated 4 hours after application by: [1] Wetting or soaking with water, keeping the surface wet for the next 2 hours, followed by drying; [2] Wetting or soaking with a 0.5% ammonia solution, followed by drying
  • Maximum interval is only unlimited when the surface is free from any contamination

 

Curing time for DFT up to 75 µm (3.0 mils)
Substrate temperature Dry to handle Full cure
0°C (32°F) 2 hours 4 days
10°C (50°F) 1 hour 3 days
20°C (68°F) 30 minutes 46 hours
30°C (86°F) 20 minutes 36 hours

 

Notes:

  • DIMETCOTE 9 / SIGMAZINC 9 is a moisture curing zinc silicate, this means that it only cures after sufficient take up of water from the atmosphere during and after application
  • It is recommended that relative humidity and temperature are measured during the curing time
  • Relative humidity during curing recommended to be above 50%
  • Adequate ventilation must be maintained during application and curing (please refer to INFORMATION SHEETS 1433 and 1434)
Pot life (at application viscosity)
Mixed Product Temperature Pot Life
20°C (68°F) 8 hours

 

It is your responsibility to read the Product Data Sheets (available below) before you place an order and prior to application of the product. The content of this website is our best recommendation and is not advice. Coverage rates quoted are approximate, you agree that coverage depends on the condition of the substrate, surface absorption, texture and application method. We ALWAYS recommend a trial area is coated to ensure the product meets your requirements before use.

Product Details
283467

Data sheet

Manufacturer
PPG
Parts
Two
Base Type
-
Solvent
-
Mixing Ratio
77:23
Suitable Substrates
Steel
Key Features
Good impact and abrasion resistance, good low-temperature curing, complies with the compositional requirements of SSPC-Paint 20, Level 1
Application
Spray
Touch Dry (at 20°C)
15 minutes
Dry to Handle (at 20°C)
-
Dry to Recoat (at 20°C)
Minimum 24 hours
Fully Cured (at 20°C)
After 46 hours
Pot Life (at 20°C)
8 hours
Coverage
8.4 m²/l for 75 µm (337 ft²/US gal for 3.0 mils)
Recommended Thinner/Cleaner
PPG Thinner 90-53, PPG Thinner 90-58, PPG Thinner 21-06, PPG Thinner 21-25
Unit Contents
-
Compatible Primers
-
Compatible Topcoats
-
Max. Application Temperature
400°C (750°F)
Min. Application Temperature
-90°C (-130°F)
Density
2.4 kg/l (20.0 lb/US gal)
Solids by Volume
63 ± 3%
Heat Resistance (up-to)
540°C (1000°F)
VOC
Directive 1999/13/EC, SED: max. 221.0 g/kg. UK PG 6/23(92) Appendix 3: max. 480.0 g/l (approx. 4.0 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
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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