About CompaLab

   CompaLab organises proficiency testing programs - also named PTP or interlaboratory comparisons or round robin tests - along ISO 13528 and ISO/IEC 17043 standards in order to evaluate the capacity of the participants to perform identified tests. The scope of these proficiency testing programs includes the tests on metals and metallurgy, particularly on steels, ferrous materials, copper alloys and coated steels (painted and galvanised steels). Any laboratory holding equipment and human resources necessary to perform these tests may participate, regardless of its legal status.

For more details, see About CompaLab.


What is a proficiency testing program (PTP) ?

   A proficiency testing program (PTP) or interlaboratory comparison (ILC) allows to evaluate the reliability of laboratories services, by sharing results of a same test, performed on a same product by all the participating laboratories. Furthermore, uncertainties on test results may be computed from results of these interlaboratory comparisons.

For more details, see What is an ILC


Register to participate to a proficiency testing program (PTP)

Several possibilities are offered to register : see all details at Register to participate


Proposed proficiency testing program (PTP)

In 2019, 57 proficiency testing schemes (interlaboratory comparisons) are taking place in the following areas:

Type of test


Chemical analysis of metals and ferro-alloys

Non-alloy steel, low alloy steel, high-alloy steel, stainless steel, copper alloy, aluminium alloy,
ferromanganese, ferrosilicon, ferrochrome, ferro niobium


ISO 643 ASTM E112 grain size - ISO 4967 non-metallic inclusions content on unalloyed steel and stainless steel
ISO 3887 ASTM 1077 decarburization depth - ISO 945-1 classification of graphite in cast iron

Heat treatments

ISO 2639 case hardening depth - ISO 642 ASTM A255 Jominy hardenability

Intergranular corrosion tests on stainless steels

ISO 3251-1
ISO 3251-2 ASTM A262.5 different test methods

Determination of the roughness parameters of a
metal surface

ISO 4287
ISO 4288

Zinc coating tests

ISO 1460 - ISO 3882 - ISO 2808 - ISO 2178 thickness - ISO 9227 salt spray tests
ISO 6988 ASTM G87 Kesternich sulphur dioxide test

Determination of the properties of liquid paints

ISO 2811 viscosity - ISO 3251 percentage non-volatile - ISO 2431 density

Paint coating test

ISO 2808 thickness, ISO 2813 gloss, ISO 7724-1, ISO 7724-1, ISO 7724-1, -2, -3
ISO 11664-4, -6 colour, ISO 2409 ISO 4624 adhesion ISO 1520 stamping test
ISO 9227 salt spray tests - ISO 3231 ASTM G87 sulphur dioxide Kesternich

Charpy impact bending tests

ISO 148-1 ASTM E23, 3 energy levels, at room temperature and low temperature

Brinell, Rockwell and Vickers hardness tests

ISO 6506-1
ISO 6507-1 ISO 6508-1, 2 hardness levels

Tensile tests

ISO 6892-1 ASTM E8 tensile test on specimens machined at room temperature
ISO 6892-2 high temperature - ISO 6892-1 on flat steel, stainless steel, steel tube, wire rod
ISO 898-1 on screws or bolts

Mechanical tests

ISO 7438 bending test, ISO 7799 rebend/reverse bending test
ISO 8492 tube flattening test - ISO 12106 fatigue test, ISO 12135
ISO 12737 ASTM E399 ASTM E1820 fracture mechanics test

Tests on welds

ISO 6520 geometry - ISO 4136 traction

Tests on reinforced concrete steels

ISO 156+D5:E1930-1 Tensile test, geometry of cold and hot rolled steels, fatigue test
ISO 15630-2 shear test on welded mesh