before cleaning
Test the appearance of the workpiece, the front is EMC sealant, and the metal contacts on the back are pasted with PI material tape.
The purpose of this test is to confirm the ability of the agent to remove EMC and whether the tape can withstand the erosion of the agent. Acid and alkali resistant tape is attached to the back of the package with cut corners on the leftmost four sides of the picture below. In the picture below, the two packages on the far left without cut corners are pasted with ordinary adhesive tape on the back.

After soaking the ACHM04-Aplus at 90°C for 60 minutes, it was found that the black EMC overflow glue on the side was soft and rotten.
Use a plastic tube to scrape lightly, and the EMC overflow can be easily scraped off.

The EMC on the front surface of the packaging chip has been slightly softened due to the intrusion of the chemical agent, and the surface can be scraped off with stainless steel tweezers.

The general PI tape on the back of the package looks intact and undamaged.

Increase soaking temperature. Heat hardening ink cleaner ACHM04-Aplus to 120°C. Insert the packaging sheet (the back of the packaging sheet with cut corners is covered with acid and alkali resistant tape), and soak for 1 hour.

It was found that the EMC on the package had swelled and detached.

The acid and alkali resistant tape looks unharmed.

in conclusion：

8.1 ACHM04-Aplus can remove this black EMC sealant.
8.2 ACHM04-Aplus will not harm the two PI tapes.
8.3 ACHM04-Aplus will invade the black EMC sealant, causing the black EMC sealant to soften. High temperature and prolonged immersion may cause EMC to swell and warp the packaging metal sheet. It is recommended to selectively remove EMC through temperature, time control, and PI tape masking.

before cleaning
The appearance of the test piece, the metal disc is pasted on the slate/cement block/tile/tile with AB hardened glue. In the past, after the customer smashed the slate/cement block, etc., the AB glue attached to the disc was burned with a flame. After it is carbonized, use a knife to scrape off the AB glue remaining on the disc. Recycling metal discs in this way is time-consuming and labor-intensive, which consumes a lot of labor costs.
The purpose of this test is to remove the AB glue attached to the metal disc with a chemical agent, reduce labor costs, and the metal disc cannot be injured.

Crush the cement block of the test piece so that the AB glue is completely exposed.

After immersing the metal disc in ACHM04-Aplus at room temperature (20°C) for 48 hours, it was found that the AB hardened glue on the metal disc had become soft and rotten.

After taking out the disc, I found that the AB hardened glue has completely softened and turned into a jelly-like shape, which can be easily removed by brushing.

Repeat the test. The customer provides another test piece. The metal disc is attached to the tile with another commonly used AB glue.

After directly soaking the test piece together with the tiles in ACHM04-Aplus at room temperature (20°C) for 48 hours, it was found that the AB hardened glue sticking the metal disk and the tiles had become soft and rotten.

take out. It was found that the exposed AB glue was soft and rotten, and some of the AB glue dissolved and formed voids. Gently scratch the gap with the blade, and the metal disc will be separated from the tile. The exposed AB glue is jelly-like and can be easily removed by brushing.

Artifact description:

The test workpiece is a stainless steel mold with EPOXY ink sprayed on it. The customer used to use hot steel mold cleaner HMC06, heated to 70~80°C, and cleaned with ultrasonic waves; It works well for a few days, but after a few days of use, the HMC06 agent is difficult to clean within 30 minutes.
The purpose of this test is to find a more suitable agent, which has the advantages of good paint stripping effect and long service life, so as to meet the needs of customers for paint stripping.

Test formula 1: Increase the alkalinity contained in the hot steel mold cleaning agent HMC06 by 3 times to make HMC06plus, hoping that the new agent can improve the paint stripping efficiency and have a longer service life.
Heat the hot steel mold cleaning agent HMC06plus to 70~80°C, put it into the stainless steel mold to be cleaned and soak it.

Test formula 2: Increase the surfactant and alkalinity contained in hot steel mold cleaning agent HMC06 by 2 times at the same time to make HMC06plus3, hoping that the new agent can improve the paint stripping efficiency and have a longer service life.
Heat the hot steel mold cleaning agent HMC06plus3 to 70~80°C, put it into the stainless steel mold to be cleaned and soak it.

Test formula three:
Use the hardened ink remover ACHM04-Aplus, heat it to 70~80°C, put it into the stainless steel mold to be cleaned, and found that ACHM04-Aplus has a good cleaning effect on this stainless steel workpiece.
Sheet 1:

Let the used hardening ink remover ACHM04-Aplus cool and let it stand overnight to simulate the overnight use of the factory.
After overnight, reheat the agent to 70~80°C, and place the workpiece to be cleaned:

Clean the 10th tablet:

in conclusion:

ACHM04-Aplus can remove this gray Epoxy hardened ink. Although as the number of uses and time increase, the paint stripping ability of the agent will gradually decrease. But after using it for the 11th time (and using it overnight), the effect is still better than the paint stripping effect of the new HMC06 solution.
Customers are advised to consider replacing with hardened ink cleaner ACHM04-Aplus.