APCOSIL 605 – ZS

Product Data Sheet – PC 7045
Issued: August 2022
Pages: 1/4

---

TECHNICAL DATA

Property	Description
Colour	Light Grey
Gloss	Matt
Recommended DFT / Coat	75 µm
Theoretical Covering Capacity	7.5 – 8.0 m²/l
Drying Time at 30°C	Surface Dry: 30 minutes Hard Dry: 8 hours Full Cure: 7 days
Overcoating Interval at 30°C	Min: 8 hours Max: Unlimited, provided surface is free from contamination, corrosion, and zinc salts
Method of Application	Air Spray / Airless Spray

Note:
Data given are guidelines only. Physical values are subject to normal manufacturing tolerances, colour, and testing variances.
Actual drying and overcoating intervals may vary depending on film thickness, ventilation, humidity, and temperature.
All data are based on 30°C and 65% relative humidity.

---

DIRECTIONS FOR USE

Surface Preparation

General

• Surfaces must be dry, clean, and free from contaminants.
• Remove dirt, dust, oil, and grease as per SSPC-SP1 solvent cleaning.
• Surface should be checked and treated as per ISO 8504 prior to priming.

Blast Cleaning

• Steel: Abrasive blast clean to minimum Sa 2.5 (Swedish specification).
  • If oxidation occurs between blasting and application, re-blast the surface.
  • Recommended profile (Rz): 40–70 µm.
• Galvanized steel: Sweep blast to roughen the surface and remove any zinc salts.
• Heavily pitted steel: Not acceptable for coating.

---

Application Conditions

• Substrate temperature: Minimum 3°C above dew point and below 50°C.
• Relative humidity: Above 50%.
• Provide good ventilation in confined areas to ensure proper curing.

---

Mixing

• Supplied in two packs:
  • Liquid Component (Hydrolysate)
  • Powder Component (Zinc Dust)
• Do not open packs until ready to use.
• Stir the liquid (hydrolysate) thoroughly using a power stirrer.
• Add zinc dust gradually into the hydrolysate under constant stirring.
  • Do not reverse order — it may cause lump formation.
  • Strain the mixture through a 30–60 mesh screen.
  • Maintain constant agitation during application.
• Once mixed, consume within the working pot life.

Mixing Ratio (by weight)	Hydrolysate : Zinc Dust = 48.5 : 51.5
Induction Time	None
Pot Life @ 30°C	4 hours

---

Application

Brush / Roller

• Not recommended.

Air Spray

Parameter	Specification
Recommended Thinner	T-144
Volume of Thinner	10 – 25%*
Nozzle Orifice	2.0 – 3.0 mm
Nozzle Pressure	0.3 – 0.4 MPa (3–4 atm; 43–57 psi)

Airless Spray

Parameter	Specification
Recommended Thinner	T-144
Volume of Thinner	10 – 25%*
Nozzle Orifice	0.48 – 0.64 mm
Nozzle Pressure	15 MPa (150–190 atm; 2100 psi)

Note: Depends on required film thickness and application conditions.

---

Cleaning

• Do not allow the product to remain in hoses, guns, or spray equipment.
• Clean all equipment immediately after use with Thinner T-144.

---

PRODUCT CHARACTERISTICS

• Maintain proper spray distance to achieve a wet and smooth coating.
• Inorganic zinc silicate primers are sensitive to humidity:
  • Minimum relative humidity 50% is required.
  • Below 50%, curing is severely retarded.
  • Promote curing at low humidity by spraying fresh water after 4–6 hours and keeping the surface wet until fully cured.
• Recommended film build: 50–75 µm/coat.
  • Above 125 µm may cause mud cracking.
  • Remove cracked areas completely and reapply.
• Not suitable for immersion in alkaline (pH > 9) or acidic (pH < 5) liquids without appropriate topcoats.

---

OVERCOATING AND TOPCOATS

• Ensure complete curing before overcoating.
  • Verify as per ASTM D4752 (MEK rub test): 50 double rubs with cloth soaked in Thinner T-144 or MEK.
  • If coating remains unaffected, curing is complete.
• Surface must be clean, dry, and free from zinc corrosion products before topcoating.
• White rust (zinc corrosion) must be removed before recoating.
• Apply a mist coat of subsequent layer to minimize solvent popping.
• Recommended topcoats:
  • Epoxies
  • Chlorinated rubber
  • Acrylics
  • Polysiloxanes
  • Heat-resistant silicones
  • Other systems as advised by Asian Paints PPG representative.

---

PACK SIZE

• 23 L (Hydrolysate: 20 L, Zinc Dust: 21 kg)

---

STORAGE

• Shelf life: At least 6 months at 30°C in original unopened packs (inspect thereafter).
• Store in a cool, dry place according to local regulations.

---

REGULATORY INFORMATION

Property	Value
Flash Point	Liquid: ≥15°C Powder: >65°C
VOC	675 ± 20 g/L (as per US EPA Method 24)

---

SAFETY INFORMATION

• Avoid inhalation of solvent vapours or paint mist and contact with skin/eyes.
• Provide forced ventilation in confined or stagnant air conditions.
• Always use respiratory, skin, and eye protection while spraying.
• Refer to Material Safety Data Sheet (MSDS) before use.

---

References

Product Data Sheet – APCOSIL 605 – ZS (Zinc Silicate Primer)
Issued by Asian Paints PPG Pvt. Ltd. – August 2022
Document Version: PC 7045
Source: https://www.asianpaintsppg.com

Technical Guidelines and Explanatory Notes
Last accessed: 28 May 2025
Reference link: https://www.asianpaintsppg.com/service-support/technical-guidelines

Note: Always consult the latest version of the Product Data Sheet and related technical documents directly from Asian Paints PPG’s official website to ensure accuracy and compliance with the most current recommendations.