EK-S13

Service temperature. This grade offers good acid and alkali resistance and insulating voltage-withstand capability, with good durability in acids, alkalis, salts, organic solvents and similar media. It operates stably over long-term service from -50 °C to 280 °C; specially treated versions withstand temperatures above 350 °C.

Basic Coating Data

• Coating appearance: Transparent — Visual inspection

• Coating type: One-component

• Mixed density: 1.02–1.13 g/cm³ — Measured

Coating Film Properties

• Condition in container: Uniform; free of caking and sediment — Visual inspection

• Mixed viscosity: 50–70 s (Tu-4 viscosity cup, 25 °C) — GB/T 1723-1993

• Adhesion (cross-cut method): Grade 0 — GB/T 9286-1998

• Neutral salt spray resistance: 5000 h: no blistering, no cracking, no rust spots — GB/T 10125-2021

• Chemical reagent resistance — 50% H2SO4: 180 d: no blistering, no peeling, no rusting — GB/T 9274-1998

• Chemical reagent resistance — 50% NaOH: 180 d: no blistering, no peeling, no rusting — GB/T 9274-1998

• Chemical reagent resistance — 5% NaCl: 180 d: no blistering, no peeling, no rusting — GB/T 9274-1998

• Accelerated alkali resistance of coating film (20% NaOH): 180 d: no blistering, no peeling, no rusting — GB/T 1771-91

• Accelerated salt-spray test of coating film (5% NaCl): 180 d: no blistering, no peeling, no rusting — GB/T 1771-91

• Abrasion resistance (750 g / 500 r, rubber wheel type CS10): 0.019 g; 0.019 g — GB/T 1768-2006

• Chemical wastewater, immersion at 40 °C: 300 d: no blistering, no peeling, no rusting — GB/T 7410-87

Basic Application Parameters

• Coating solids content (%): ≥45

• Volatility: Low (not readily volatile)

• Theoretical coverage (m²/kg): 10–15

• Cure temperature (120–140 °C): <2 h

• Dry film thickness (µm): 30–200

• Self-curing time (h): Surface-dry 1 h; hard-dry 8 h

• Working time (pot life) (h): 6

• Peak short-term temperature resistance (°C): 400

• Thinner: Alkanes, esters, ethers

• Recommended service temperature (°C): -50 to 280

• Flash point (°C): <22 (solvent flash point)

• Warehouse storage (°C): 0–30

Application Procedure

• 1. Substrate preparation: 1) The substrate must be properly prepared: damp materials must first be dried, surface oil and grease must be removed, etc.; the substrate surface must be free of defects such as loose, raised rust nodules. 2) Defects such as pits in concrete surfaces may be repaired carefully with a putty prepared from the resin mixed with a dried powder such as calcium carbonate; once it has dried, proceed with normal coating. 3) Metal surfaces must be de-rusted; a surface-preparation grade of St2 or Sa2 is sufficient.

• 2. Coating application: Spray application is recommended. This coating is an industrial heavy-duty anticorrosive coating; the number of coats depends on the service environment of the protected object — generally 2–3 coats, with an overall thickness of 100–200 µm. Each spray pass must give complete coverage at approximately 40 µm. The interval between passes over the same point must be at least 30 minutes; the film may be recoated once it no longer sags, or once it strings when touched by hand, and the final pass must be applied before cure. The first pass mainly lets the coating penetrate the substrate to provide strong protection; the second pass is the key to overall corrosion protection and must be sprayed carefully, with no missed spots.

• 3. Curing: Curing time is closely related to film thickness, curing temperature and airflow velocity. At a given thickness and airflow, the approximate relationship between surface-dry time and temperature is: under normal temperature and humidity (20 ± 15 °C, relative humidity 65 ± 20% RH), without added curing agent, the surface-dry time is approximately 6 hours; approximately 5 hours at 30 °C; approximately 4 hours at 40 °C; approximately 3 hours at 50 °C. (Note: when the surface-dry time falls below 3 hours, the risk of quality defects increases accordingly. Attention must also be paid to the gradient of the heating curve — going directly to a high-temperature state after application will impair coating quality.)

• 4. Inspection: First check visually whether the coated substrate is uniform and continuous, whether there are any missed areas, and whether the surface is glossy (a dull surface indicates excessive ambient humidity). Then use dedicated instruments to check the relevant parameters.