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Sunrise pioneered- one component PU foam oil permeability test method

Oct 16,/2021

After curing, the oil leakage of PU foam can easily cause poor adhesion and is toxic, which is harmful to the human body. The introduction of this test method solves the problem of the lack of identification methods for the oil leakage of the foam sealant and fills the industrial blank.

  1. Scope of application

This test method describes how to test whether one-component PU FOAM (OCF) leaks oil after curing.

  1. Steps in brief

Spray foam sealant on the PE film, after curing for 24 hours, cut out a fixed size foam, transfer it to A4 paper, press the foam onto a 1kg weight, and place it in an oven at 50°C for 24 hours to observe the oil permeability

  1. Background and purpose

The purpose is to determine whether the cured product has oil leakage.

  1. Device

Controllable constant temperature and humidity laboratory;

Adjustable temperature oven;

PE plastic film;

1kg weight;

Several sheets of A4 paper: 70g/m2.

Two boards (wooden boards or other lightweight boards): about 100g, size recommendation: length and width 100*200mm

Utility knife

  1. experiment procedure

5.1 Preparation

Place the sample tank to be tested in the test environment (23°C, 50% relative humidity) for at least 24 hours.

5.2 Step

  1. Shake the one-component foam sealant (OCF) cans for60 times;
  2. Install nozzle or foamgun;
  3. Discard the front 30-50g foam;
  4. Punch 5-6 uniform foam strips without leaving gaps on the PE film, each with a length of more than 20cm and a diameter of 3-4cm;
  5. After curing for 24 hours, cut into foam blocks with length and width of 200*100mm (Figure 1).
  6. Place one or several sheets of A4 paper neatly on one of the boards, place the cut foam block on it, and press a sheet of A4 paper, a board and a 1kg weight on the foam block in order (such as figure 2).
  7. Then place it in an oven at 50°C.
  8. After 24 hours, observe whether there is any oil stains on the A4 paper below or above.
    1. 6.Judgment criteria

    Observe that there is no oil stains on the upper and lower sides, it is judged that the product does not leak oil.

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