TDS Generator — PU Primer (2K) Aromatic System

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Mix Ratio (by volume)

Mix Ratio (by weight)

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Product Description

Two-component polyurethane primer based on a compatible polyol resin (Part A) cured with an aromatic polyisocyanate hardener (Part B). Designed for industrial protection on properly prepared metal substrates. Provides excellent adhesion, sealing, and a smooth base for polyurethane topcoats. Aromatic systems can yellow under UV; recommended as primer/undercoat and not as final exterior finish.

System Type

PU Primer (2K) — Polyol base + Aromatic polyisocyanate hardener

Mixing

Mix ratio: Base : Hardener = 4 : 1 (vol) | 100 : 25 (wt) (typical) • Induction: 5–10 min • Pot life: ~3–4 h @ 30 °C

Typical Technical Data (Mixed Material)

Volume solids

~45 ± 3 % (typical)

VOC

Typically < 420 g/L (as supplied)

Specific gravity

~1.25 ± 0.05 (mixed)

Mix ratio (by volume)

Base : Hardener = 4 : 1

Mix ratio (by weight)

Base : Hardener = 100 : 25 (typical)

Pot life @ 30 °C

~3–4 h (depends on mass & temperature)

Induction time

5–10 min (recommended)

Recommended DFT / coat

30–40 µm/coat

Recommended system DFT

60–100 µm (primer build)

Theoretical coverage*

8–10 m²/L @ 40 µm DFT

Drying @ 30 °C

Touch: 30–45 min • Recoat: 4–24 h • Full cure: 7 days

Service temperature

Up to ~90 °C dry (typical PU primer limitation)

Thinner / Cleaner

PU thinner (aromatic/ester blend) as recommended

Shelf life

12 months (Base) & 12 months (Hardener) in sealed containers

*Actual coverage varies with profile, losses, and application method. Typical values are indicative; confirm by site trials.

Components

Component	Typical Description
Part A — PU Base	Pigmented/filled polyol resin blend with additives for flow, wetting, anti-settling, and sanding (primer grade).
Part B — Aromatic Hardener	Aromatic polyisocyanate hardener (moisture sensitive). Reacts with polyol to form polyurethane network.
Mixed Material	Crosslinked polyurethane film after cure; provides adhesion, toughness, and a uniform base for topcoats.

Surface Preparation

Remove oil/grease by suitable degreasing. Ensure surface is clean, dry, and free from salts/dust.
Steel: abrasive blast to Sa 2½ (ISO 8501-1) / SSPC-SP10; profile 35–75 µm recommended.
If blasting not possible: power tool cleaning minimum St 3 and ensure firm, feathered edges.
GI/Aluminium: scuff sand or sweep blast; use suitable pretreatment/conversion coating as required.
Ensure substrate temperature is at least 3 °C above dew point during application and curing.

Mixing & Application

Step / Method	Details
Mixing order	Pre-mix Part A to uniformity. Add Part B (hardener) in full quantity. Mix 2–3 minutes until homogeneous.
Induction (recommended)	Allow 5–10 minutes after mixing before application for better flow/leveling (site practice dependent).
Moisture control	Keep hardener container tightly closed. Use dry air supply and avoid application at very high humidity/condensation risk.
Brush/Roller	Suitable for stripe coats and small areas. Thin 0–10% if required. Apply evenly to achieve specified DFT.
Conventional spray	Thin 10–20% with PU thinner; adjust viscosity to equipment. Use clean, dry compressed air.
Airless spray	Tip 0.013–0.017" • Pressure 1500–2500 psi (as required). Use wet film gauges for control.
Stripe coating	Apply stripe coat on edges, welds, bolts, and sharp corners prior to full coat for better protection.
Recoat window	Recoat typically 4–24 hours at 30 °C. If exceeded, light abrasion may be needed for intercoat adhesion.

Practical Notes

Aromatic PU systems are not UV stable as final finish. For exterior durability, overcoat with aliphatic PU topcoat. Chemical resistance develops after full cure; avoid early water/solvent exposure.

Recommended Coating System (example)

Surface prep: blast cleaning Sa 2½; profile 35–75 µm
1 coat 2K PU Primer (Aromatic) — DFT 35–40 µm
1–2 coats PU Topcoat (Aliphatic recommended for exterior) — as per service requirement

Final system selection depends on environment (UV, chemical, marine, atmospheric), substrate, and service needs.

Handling & Safety

Isocyanates can cause sensitization; avoid skin/eye contact and inhalation. Use gloves, goggles, and protective clothing.
Provide adequate ventilation; use appropriate respirators when spraying.
Keep away from heat/sparks/open flame. Follow solvent handling precautions.
In case of contact: rinse with water, seek medical attention as required. Refer to SDS for full guidance.

Humidity & Foaming / Pinholing Risk

Moisture can react with isocyanate causing CO₂ bubbles, pinholes, and reduced gloss. Avoid application in condensation/high humidity; use dry air and suitable thinner/retarder when needed.

Quality Control (Suggested)

Monitor WFT/DFT, mixing ratio, pot life, ambient/dew point, adhesion, and cure (solvent rub/MEK where applicable).

Packaging & Storage

Supplied as two components (Part A + Part B) in matched kits. Typical pack sizes: 5 L, 20 L kits (as agreed). Store in a cool, dry, well-ventilated place away from direct sunlight and ignition sources. Keep containers tightly closed. Protect hardener from moisture ingress. Do not freeze. Rotate stock on FIFO basis.

Notes & Disclaimer

Values shown are typical and may vary by pigmentation, hardener selection, batch, and application conditions. Always verify suitability by testing on a small area and confirming performance under actual service conditions. This document is provided for guidance only and does not constitute a warranty. For project-specific recommendations, consult your technical representative.