RTV SILICONE SEALANT ADHESIVE (ACID) foaming during construction has many reasons and is more complicated. It is difficult to use one method and one result to determine the cause of foaming.

1) Air is wrapped in the glue: RTV SILICONE SEALANT ADHESIVE (ACID) usually completes the glue injection on the construction site, and the working conditions are poor. Workers stand on the scaffold to inject glue, and the uniformity of the glue is not easy to grasp, and air is easily trapped in the glue joints.
Solution: When injecting glue, pay more attention to the uniformity of glue injection. Generally, vertical glue joint injection can adopt glue sizing from bottom to top, which can overcome some blistering phenomenon. More important is the proficiency and sense of responsibility of the work operator.

2) Glue injection habit of workers: In the glue injection construction, it is often found that many people use soapy water, detergent water, washing powder water, etc. to spray the glue joints, and then smooth them by hand to ensure The glue does not stick to your hands, but I did not expect that the running water will be absorbed by the foam bar, that is, the water is dry. As long as there is soap, detergent, and washing powder on the foam bar, the glue will rise when the glue is applied during the sun exposure. bubble.

3) Humidity conditions: When working outdoors, rainfall is often encountered, especially in the southern summer, where it rains almost every day. If the interface is wet and dry after rainfall, inject glue directly, and wait for the sun to irradiate the bonding substrate and The temperature inside the interface rises during the glue joint, and the moisture in the glue joint evaporates, which will foam the uncured and soft glue joint. Sometimes the wet polyethylene foam pad will cause the glue joint to foam.
Solution: Do not blindly seek progress during construction. Wait until the interface is dry before injecting glue to avoid the above situation.

4) Sun exposure conditions: RTV SILICONE SEALANT ADHESIVE (ACID) cannot be exposed to the sun before it is cured, especially if it is exposed to the sun just after the glue is injected, it will cause honeycomb bubbles inside the glue joint, which will cause the glue joint. External bulge, this situation will be more obvious when alcohol type RTV SILICONE SEALANT ADHESIVE (ACID) is used. In the hot summer construction, this situation is not easy to overcome.　　
Solution: Avoid sun exposure when injecting glue, which will overcome some bubbling. Specific methods: inject glue on the west or north side of the building in the morning, and on the east or south side of the building in the afternoon. After the glue is injected, the glue is cured for a period of time, and the surface layer has been skinned. When it is exposed to the sun, it has a certain resistance and can overcome some blistering.

5) The surface temperature of the substrate is too high: When RTV SILICONE SEALANT ADHESIVE (ACID) is cured, the temperature of the bonded material cannot exceed 50°C. This conclusion has been recognized by most RTV SILICONE SEALANT ADHESIVE (ACID) manufacturers. Injecting glue when the surface temperature of the substrate exceeds 50℃, it will cause the glue joint to foam. The above situation will be encountered in the weather-resistant caulking of the metal panel curtain wall. In the hot summer, when the metal plate is exposed to the sun, especially the surface temperature of the aluminum plate will reach 80℃, the glue injection will easily cause the glue joint to bubble.
Solution: Choose to inject glue in the latter half of the afternoon or on a cloudy day to improve the above situation.