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Sunrise’s creation- one-component PU foam oil penetration test method!

Jun 24,/2021

The cured foam oil permeability can easily decrease bonding strength and it is harmful to the human body. The introduction of this test method solves the problem of the lack of identification methods for the oil permeability of foam sealants and fills the gap in the industry.
1 Scope of application
This test method describes how to test whether one-component foam sealant (OCF) leaks oil after curing.
2 Steps
Spray foam on the PE film, after curing for 24 hours, cut a fixed size foam, put it on one piece of A4 paper, put a substance of 1kg weight on the foam, and put it in an oven at 50°C and keep for 24 hours to observe the oil permeability.
3 Test purpose
The purpose is to determine whether the cured foam leaks oil.
4 tools
Controllable constant temperature and humidity laboratory;
F281 Fire-retardant PU foam
Adjustable temperature oven;
PE plastic film;
Substance of 1kg weight;
Several sheets of A4 paper: 70g/m2.
Two boards (wooden boards or other lightweight boards): about 100g, recommended size: 100*200mm (L*W)
5 Test procedure
5.1 Preparation
Place the sample PU foam 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) can 60 times;
2. Install straw or foam gun;
3. Discard the first 30-50g foam;
4. Spray 5-6 uniform foam strips each with a length of more than 20cm and a diameter of 3-4cm, without leaving any gaps on the PE film; 5. After curing for 24 hours, cut into foam blocks with length and width of 200*100mm (picture 1).
6. Place one or several sheets of A4 paper on one of the boards, place the foam block on it, and put a sheet of A4 paper, a board and a substance of 1kg weight on the foam block (such as picture 2).
7. Then place and keep it in an oven at 50°C.
8. After 24 hours, observe whether there is any oil stains on the A4 paper.

6 Judgment criteria
If there is no oil stains on the upper and lower paper, it can be concluded that the OCF does not leak oil.

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