Glue can be used for direct connection of plastic pipes, the principleGlue can be used for direct connection of plastic pipes, the principle lies in its excellent adhesion ability. Especially PVC glue, which is designed for bonding PVC materials. When applied to the surface of the pipe to be connected, it can quickly and tightly bond the two pipes together.
Bonding method is a common way to connect plastic pipes, mainly used for connecting hard PVC pipes and ABS pipes. During the bonding process, a short pipe slightly larger than the pipe needs to be used to sleeve the two pipes together, then apply PVC glue inside, and bond them together. The advantage of this method is simple operation, low cost, and high sealing performance.
Of course, different methods may be used for connecting plastic pipes. For example, pipes with a diameter of 100 mm or more generally use rubber ring joints; while pipes with a diameter less than 100 mm usually use bonded joints. As long as the operation is proper, glue can provide strong and sealed connections for plastic pipes.

PVC adhesive is considered a hazardous material primarily due to its flammability. 
Its main components are perchloroethylene resin (epoxy resin), acetone, and butanone, all of which have certain risks of combustion and explosion. Especially acetone and butanone, they not only have a pungent smell but are also slightly toxic. Although the impact of these substances on the human body is relatively small after the glue dries, special attention must still be paid to safety during handling and use. Therefore, when using PVC adhesive, it is essential to avoid sources of ignition and work in a well-ventilated environment to prevent accidents.
In addition, PVC adhesive has a certain degree of corrosiveness. If it accidentally comes into contact with the skin or eyes, it may cause irritation and pain. Therefore, try to avoid direct skin contact when using it, and wear protective goggles and gloves if necessary.
At the same time, PVC adhesive has strong volatility. Prolonged inhalation of its vapors may affect the respiratory system. Therefore, when using PVC adhesive, it is best to keep the room well-ventilated and avoid prolonged exposure to its smell.
Finally, because PVC adhesive contains combustible materials, special care is needed during storage and transportation. It should be stored in a cool, dry, well-ventilated place, away from fire sources and high-temperature environments. At the same time, avoid exposing PVC adhesive to sunlight to prevent changes in its composition.

If you don't have PVC-specific glue, you can try the following methods:
1. Use general-purpose glue: You can use ordinary transparent glue or white glue as a substitute. Apply the glue evenly on the connection area of the PVC pipes and quickly join the two pipes together. Wait for some time for the glue to dry, ensuring a secure connection.
2. Use quick-drying glue: If you need a faster connection, you can use quick-drying glue. Apply the glue on the connection area of the PVC pipes and quickly join the two pipes together. Wait for a few minutes for the glue to dry, ensuring a strong bond.
3. Use a heat gun: If you require an even stronger connection, you can use a heat gun. Set the heat gun to an appropriate temperature and apply heat to the connection area of the PVC pipes, softening them. Then quickly join the two pipes together and wait for cooling to obtain a secure connection.

The main functions of plasticizers in adhesives are as follows:
1. Adjust the viscosity and flowability of the adhesive: Plasticizers can reduce the viscosity of the adhesive and improve its flowability, making it easy to apply and operate.
2. Improving the flexibility and ductility of adhesives: Plasticizers can increase the flexibility and ductility of adhesives Enable its county to have better elasticity and plasticity, thereby enhancing adhesive performance.
3. Improve the adhesion and bonding strength of the adhesive: Plasticizers can increase the contact area between the adhesive and the bonded material, improve the adhesion and bonding strength, and make the bonding strength higher.
4. Adjusting the hardness and temperature resistance of adhesives: Plasticizers can adjust the hardness and temperature resistance of adhesives to adapt to different application environments and working conditions.

There are various types of adhesives for pipe fittings, withThere are various types of adhesives for pipe fittings, with PVC adhesive being a common choice. PVC adhesive is mainly used for bonding PVC pipes and fittings, with high viscosity and medium drying characteristics, suitable for all sizes of PVC pipes and fittings with a diameter of 24'' (630mm) or less. In addition, the gray PVC adhesive 711 meets ASTM D-2564 standards and can fill the gap between the pipeline and the fitting, providing longer construction time. If the household water supply pipe is rigid PVC pipe, then you can directly use oily PVC adhesive such as JL-6284, and the bonding strength after completion is basically integrated. For metal pipes that have leaks, you can use metal repair agents for repair. It should be noted that different types of pipes may require different special adhesives, such as PE pipes requiring PE special adhesives. When choosing adhesives, try to choose products with good quality and high reputation, and pay attention to the fact that different types of pipes may require different special adhesives.

In addition to PVC adhesive, other common types of adhesives on the market include instant glue, epoxy resin bonding class, anaerobic glue, UV glue (ultraviolet light curing), hot melt adhesive, pressure sensitive adhesive, latex adhesive, etc. These adhesives have their specific purposes and bonding objects. For example, anti-corrosion sealant used for water supply and hot water supply can seal the gap between metal pipe joints to prevent fluid leakage, and is commonly used in spray pipelines, hot and cold water pipelines, air pipelines, hydraulic pipelines, stainless steel pipelines and other scenarios. In addition, Henkel Loctite's pipe sealant is widely praised. This type of adhesive is suitable for metal pipes and various scenarios such as gas, liquid and corrosive liquid. When choosing adhesives, try to choose products with good quality and high reputation, and pay attention to the fact that different types of pipes may require different special adhesives.

When choosing a good glue, you need to consider the following aspects:
1. Adhesive object: Different materials require different types of glue, so you need to choose the right glue according to the material of the adhesive object. For example, PVC pipes require PVC-specific glue, while metal pipes require metal repair agents or metal-specific glue.
2. Adhesive method: There are various methods of gluing, such as pressure bonding, soaking bonding, brush bonding, etc. You need to choose the appropriate glue according to the specific bonding method.
3. Drying time: The drying time of different types of glue varies, some may take a long time to dry, while others can dry quickly. You need to choose a glue with a suitable drying time based on your actual needs.
4.Brand reputation: Choosing a well-known brand of glue can improve product quality and after-sales service protection. You can learn about the reputation of the brand through user reviews and product certifications.
5. Price: Price is also a factor to consider when choosing glue. You need to choose a product with high cost performance based on your budget.
6. Use environment: Different glues are suitable for different environments, such as high temperature, low temperature, humidity, etc. You need to choose a suitable glue based on the actual use environment.
7. Strength requirements: Different bonding tasks have different strength requirements. You need to choose a glue with sufficient strength based on your actual needs.
8. Durability: A good glue should have good durability and be able to maintain bonding effect for a long time. You can learn about the durability of the glue by checking the product manual or consulting professionals.
9. Safety: Safety issues need to be considered when using glue, such as avoiding contact with skin and eyes, etc. You need to choose a glue that meets safety standards.
10. Storage conditions: A good glue should be able to be stored for a long time under proper storage conditions without affecting the use effect due to improper storage. You need to understand the storage conditions of the glue and store it accordingly.

11. Color: Some glues are transparent and colorless, while others are colored. You need to choose whether you need a colored glue based on your actual needs.
12. Toxicity: Some glues may contain toxic ingredients, so you need to pay attention to safety when using them. It is necessary to choose non-toxic or low-toxicity glue.
13. Curing time: Some glues take a long time to fully cure, while others can cure in a short period of time. You need to choose a glue with a suitable curing time based on your actual needs.
14. Chemical resistance: A good glue should have good chemical resistance and be able to withstand the erosion of various chemicals. You need to choose a glue with good chemical resistance.
15. Removability: Some bonding work needs to be disassembled later, so you need to choose a glue with good removability.