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Model PA-760 Cupping Test Machine

The PA-760 Cupping Test Machine tests the elasticity and adhesive qualities of lacquers, paints and other protective coatings applied to a metal substrate. The test method is described in ISO 1520, BS 3900E4, DIN/ISO 1520. The standards call for a hemispherical indenter of 0.79" (20mm) diameter made from hardened, polished steel.

The indenter is applied under pressure to the uncoated side of the test panel, concentric with the indenter is a corresponding die. As the test panel is deformed, the coated surface is kept under observation.

 PA-760 Cupping Test Machine
  • Easy To Use
  • Robust Mechanical Construction
  • Reproduction Results at an Economic Cost
  • Minimal Maintenance Requirement

Determination
The test may be carried out using one of two procedures, 'Predetermined depth (go/ no go)', or 'Minimum depth required to cause failure'. These methods are detailed under general procedure below.

Test Panels
The recommended test panels are rectangular of not less than 2.77" (70mm) square [instrument capacity (3.56") 90mm wide] of burnished steel with a thickness of not less than .012" (0.3mm ) to a maximum of .049" (1.25mm). Testing using a maximum panel thickness of .049" (1.25mm) and a tensile strength not exceeding 280N / mm2 (MPa) a deformation of .28" (7mm) can be achieved.

General Test Procedures
The following procedures are for guidance only, for more detailed explanation refer to method defined in relevant national standard.
  1. Predetermined Depth (Go/No Go)
    The following procedure shall be carried out on two separate test panels (if the results differ, additional tests shall be made). Hold test panel firmly between the retaining ring and die with the coating towards the die and with hemispherical end of the indenter in contact with the test panel (zero position of indenter). Adjust panel until central axis of the indenter intersects the panel at least 1.38" (35mm) from each edge.

    Advance the hemispherical end of the indenter into the test piece at a constant rate of approximately 8 mils (0.2mm/s) until the specified depth is reached, i.e., until the indenter has traveled this distance from the zero position. Using normal vision or, by agreement, a magnifier, examine the coating of the test panel for cracking and/or detachment from the substrate.

    When removing test panel, first slacken the indenter handwheel to relieve pressure, then unscrew the upper clamping wheel to free the panel.

    Note 1. If a lens is used, it is essential to mention this fact in the test report and to avoid misleading comparisons with results obtained using normal vision only.
    Note 2. The test results shall not be regarded as valid if the substrate shows signs of cracking.

  2. Minimum Depth Required to Cause Failure
    Carry out the procedure given in Test 1 until, using normal vision (or by agreement, magnifier) a crack is first observed on the surface of the coating and/or the coating begins to become detached from the substrate**. Stop the indenter at this point and measure the depth of indentation to the nearest 4 mils (0.1mm), i.e., the distance traveled by the indenter from the zero position. Confirm the result by repeating the determination on a fresh panel (if the results differ, further determinations shall be made).

    **In order to facilitate accurate observation of the end point , it is permissible to reduce slightly the rate of advance of the indenter when approaching the expected end point (determined, in a preliminary test.)

Available Items - Literature
Prices subject to change    Prices listed in US dollars for domestic shipments within US, Canada, & Mexico only    Export orders require quotations - click here for a quote     For more info call us 1-800-762-2478 or 954-946-9454.
Item Number Item Prices
PA-760 Cupping Test Machine, complete $4,288.00
Owing to continuous development, the manufacturers reserve the right to introduce improvements and modify specifications without prior notice.
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