What instrument to measure the thickness of the conformal coating on the circuit board?

There is a thickness tester.

Conformal coating is preferred Xinwei conformal coating, there are a variety of materials to choose from, and the thickness can be selected from 20um-10mm. Choose different materials and different processes to determine the thickness. The spray is thinner, the brush will be thicker, and then it depends on the material, some materials are thick, some are thin, you can consult Xinwei conformal paint customer service.

They have branches in Shenzhen and Suzhou.

It is recommended that you choose a wet film thickness gauge, which is highly accurate!

Thickness tester.

Slicing is also possible.

Hello, as far as I know so far, there are three ways.

1.Measured with contact instruments, eddy current instruments, surfix, contact measurement, will not destroy the conformal adhesive, is also very accurate, and is not high. The PCB board can be divided into three layers, the first layer is the copper foil inside the PCB board, the second layer is the green oil on the surface, and the third layer is the conformal coating.

It is required that the area of the copper foil position should reach more than 5 5mm, and there should be no components on the surface of the surface.

If the measurement area is not reached, you can find some copper plates and the like to spray conformal coating with the PCB, and then directly measure the thickness of the conformal coating on the copper.

2.Destructive instrumentation, metallographic method. It is to use a knife to cut the sprayed conformal paint, and use a magnifying glass to observe the thickness, the disadvantage of this method is that it is inefficient and needs to be destroyed, and it is suitable for spot check or inspection.

But after all, the conformal coating is a soft material, and the conformal coating will be deformed when the tool is cut, so that the measured thickness is low and the error is relatively large.

3.With ultraviolet light, the cheap one is just illuminated, and the color is the conformal paint, which needs to be seen by the human eye, and the approximate amount is judged by experience, and the error is quite large. The expensive instrument analyzes the specific thickness according to the reflection of the conformal coating after being irradiated by ultraviolet rays, with high precision, minimal impact on the product, and high efficiency.

Summary: The first method is the most convenient and practical, but the instrument should also be selected, and the cheaper instrument is because the first layer of copper foil is very thin, the instrument induction is not accurate, and the error will increase. Surfix has been tried and tested to meet the measurement requirements.

Hopefully, thank you!

Before applying conformal coating, the motherboard should first be cleaned, and then after it has been baked and dried, the conformal coating should be applied again. The conformal paint applied to the board can be seen with the naked eye whether the adhesion is strong and whether the transparency is OK. Whether the brush is evenly applied and whether it will blister or whiten.

After the conformal coating is fully cured, a little water can be sprinkled on the surface of the board to detect whether it can have the effect of waterproof and moisture-proof. In addition, the effect of anti-corrosion and salt spray can not be seen immediately, and after a certain period of time, the plate will be injured by immersion in the perennial pollution. Conformal coating can reflect its protective value.

The above is our own conformal coating test, of course, there is also a perfect testing organization, there are special machines can do moisture-proof, anti-corrosion, anti-salt spray testing, with a film thickness meter to measure its thickness, more can consult Mintong Barco.

, composite test PCB A uphill layer paint layer thickness.

You can measure it directly with the measuring instrument.

If you want to test the thickness of the coating on a PCB, I think you can use a ruler in millimeters or centimeters.

To test the thickness of this conformal coating, if you get on the car, you must have a special instrument, so that you can measure it directly.

How to test the thickness of the three-layer paint coating on the PC, you should use an accurate instrument to measure this thickness.

I don't know how to test the thickness of the coating emitted on the PCPA.

If you want to test the thickness of the three layers of assault on PCB A, you can mainly look at it with the construction staff, and then you can see it from its color.

How to test? The magical thickness of the fire diagram on the p c b should be used with a dedicated one.

Wouldn't it be thicker if you spray it a few more times?

How to test this upper three layers of protection is not clear.

Conformal paint thickness gauge is also known as paint film thickness gauge, oil film thickness gauge, paint layer thickness gauge, oil film thickness gauge, paint thickness gauge and other names.

Brands include Cangzhou Oupu, QNIX, Huayang Instrument, Times, Kedian, EPK, etc. **It is not easy to determine ** according to different brands **It is not the same.

Put a smooth iron plate, after painting, use an ordinary thickness gauge to measure the thickness of the paint film of the iron plate, so as to detect the thickness;

After the board is painted, before drying, the wet film card is used to check the thickness of the wet coating, so as to calculate the dry film thickness;

3.Use a micrometer or vernier caliper to measure the thickness of the PCB board first, and then measure the thickness of the PCB board after painting, so as to calculate the coating thickness;

4.If you don't care about damaging the coating, you can use a toketo or pig meter for sampling;

There are 2 test methods, the first method is to use a dry film thickness gauge, an imported instrument, very expensive, the size of a mobile phone, nearly 20,000, the test is very accurate, it is measured after the conformal paint is dry; The second method is to use a wet film test card, which is sold on the **, very cheap, and should be tested before the conformal coating is dry, and it has not been used.

Good ultrasound. UV lamps should work, but only limited to the surface, check the similar effect with a UV microscope, you can refer to my reference article on inspecting flux with a UV UV microscope see below:

With AOI detection equipment, the principle is the image comparison method. Equipment** is expensive.

It can be measured with a rotational viscometer.

When you buy a certain conformal paint, unless it is a brand that is often purchased, otherwise, you must be a little uneasy, I don't know whether the purchased product is suitable for your own production, if it is suitable for that, if it is not suitable, it will be put into production, causing significant losses What can I do. Therefore, in order to dispel the concerns of consumers, Mintong Chemical provides consumers with professional conformal coating testing methods to help you choose truly suitable and qualified conformal coating products.

1. Three-proof paint mold test.

1) Test conditions.

a Relative humidity 98 1% b No 1 water droplets are allowed on the surface of the sample during the test.

c The wind speed in the box is less than the meter second d temperature 28

e The test chamber is ventilated every 7 days for 3 5 minutes (it may be supervised once out of the box during this time) f Cycle 28 days.

2) Test requirements: O grade (mold growth is not visible to the naked eye).

2. Conformal paint salt spray test.

1) Test conditions.

a Salt spray sedimentation rate 1 2mg hour 2000px 2

B solution 5% sodium chloride solution pH = adjusted with dilute hydrochloric acid or NaOH).

c Temperature 35 2

d Spray method: Intermittent spraying. That is, continuous spraying for 8 hours, then stop heating, stop spraying, and keep it for 16 hours in the state of rest and rest seal (the last two hours are the heating time of the next cycle), a total of 24 hours for a cycle.

e Cycle 6

2) Test results: The bottom metal corrosion can not be found on the PCB circuit board.

3. Conformal paint moisture resistance test.

A test method: 40 damp-heat alternating test method is used as follows:

Stage: Temperature ( ), Relative Humidity (%), Time (Hours), Total Time (Hours).

Warming 30 to 40 85 (condensation) 16

High temperature and humidity 40 2 95 3 14

Drop 40 to 30 85 2 3 8

Low temperature and high humidity 30 2 95 3 5 6

b Testing requirements: The circuit board can not appear blistering, falling off, metal rust and other phenomena, and has the ability to protect against damp heat.

c Cycle 14

We can responsibly say that as long as a conformal coating has passed the above three tests, then it is a qualified product, and basically can preliminarily judge whether it is suitable for your production, of course, we still strongly recommend that you conduct a small batch of testing, only in this way is the most guaranteed. It can also do high and low temperature resistance tests.

There are many types of conformal coating for circuit boards, and there are many specific applications, and a specific reference standard cannot be determined when operating Mintong conformal coating. This depends on the product itself and the environment.

General electronics:

The requirements of ordinary circuit boards are not too high, and the use of general acrylic acid conformal coating or modified conformal coating can play an effective protective role. The coating thickness is generally in between, if you want to apply a thicker, wait for the conformal coating on the board to fully cure before applying it a second time.

Industrial Electronics:

For industrial products or high-demand military products, the requirements for conformal coating for circuit boards are very strict, and the conformal coating can be modified with silicone, which has a good effect on high temperature resistance and flame retardant. The thickness of the paint cover is between. The viscosity of the silicone conformal coating reaches 1000.

It can play a good role in protecting the circuit board.

The application range of conformal coating is very wide, mobile phones, TVs and other civil appliances are only a small part, and the application of conformal coating has been extended to aerospace, medical and automotive industries. In the aerospace field, the requirements for electronic equipment are very strict, and in extremely harsh environments, the demand for conformal coatings that can protect electronic equipment will definitely be broad. Lime conformal coating has excellent three-proof effect.