APC Independent Tests - Part 1

An Independent Technical Report on the Suitability of MarineLine® for Cargo Tank Coatings - By Anticorrosion Service - del dott. Norbert Ackermann


Two coats of MARINELINE (grey/white) were applied on a ballast tank section located at the SEC shipyard in Viareggio according to the following procedure:

  • Surface preparation: SA 2.5 Swedish SIS standard
  • Airless spraying of 2 full coats with a 60:1 ratio airless and a 0.021 inch nozzle size spray gun (input pressure 5 kg/cm2)
  • Brush application of 2 stripe coats.

Section of rusted ballast tank.

Airless spraying MarineLine.
Section of rusted ballast tank. Smooth finish, excellent bonding strength.

No spraying problems such as nozzle plugging, sagging, running, pinholing or overspray occured. The resulting coating film showed a very smooth finish. Final DFT range, measured with a POSITECTOR 1000, was 240 to 450 microns.

Therefore MARINELINE can be applied, without significant problems, like a traditional tank coating with satisfactory application properties.

The specified heat curing was carried out as follows:

  • Start of heating: 7.30 hrs
  • First temperature check: 9.00 hrs. 75° C
  • Second temperature check: 16.00 hrs. 83-85° C
  • End of heating: 24.00 hrs.
Heat curing. Completion of heat curing. Finished coating.

Mechanical Properties

MARINELINE, if compared to epoxy coatings with high chemical resistance, has better mechanical properties such as elasticity, impact resistance and adhesion strength. The data provided by APC shows significantly higher values when compared to epoxy coatings.

Tensile strength 780 kg/cm2 300-700 kg/cm2
Elongation 9.2% 3%
Adhesive strength 200 kg/cm2 70-150 kg/cm2
Impact resistance 146 kg/cm 10-30 kg/cm

The applied coating also showed very low values of surface roughness: Ra 0.7 - 0.8 (measured with a SURF TEST 30) compared to RA 1.5 - 2 for epoxies. These values mean a very smooth, non-stick surface, which is easy to clean.

The above mentioned data indicates that MARINELINE has a very good resistance against mechanical damages and - due to its high adhesive strength - should not be subject to underrusting. Furthermore the coating, owing to its higher elasticity, has a better tolerance to possible mechanical stress and thermal expansion of steel structures than epoxies.