There are many types of adhesives, which can be classified into numerous categories according to their composition, application, and physical form. Here is a summary of the classification and applications of adhesives from these three aspects, hoping it will be helpful to everyone.

Classification by Composition
There are a wide variety of adhesives, among which the more common ones include: urea - formaldehyde resin adhesives, polyvinyl acetate adhesives, polyacrylic resin adhesives, polyacrylic resin, polyurethane adhesives, hot - melt adhesives, epoxy resin adhesives, synthetic adhesives, etc.

1. Silicone adhesives are a type of sealing adhesive, featuring cold - resistance, heat - resistance, aging - resistance, waterproof, moisture - proof, high telescopic fatigue strength, low permanent deformation, and non - toxicity. In recent years, this type of adhesive has developed rapidly in China. However, currently, part of the raw materials for silicone adhesives in China rely on imports.
2. Polyurethane adhesives can bond a variety of materials and can maintain the physical and chemical properties of the materials even at low or ultra - low temperatures. They are mainly applied in fields such as shoemaking, packaging, automobiles, and magnetic recording materials.
3. Polyacrylic resin is mainly used for producing pressure - sensitive adhesives and is also used in the textile and construction fields. Construction adhesives are mainly used for the decoration, sealing of construction projects, or the bonding between structures.
4. Hot - melt adhesives can be divided into EVA hot - melt adhesives, polyamide hot - melt adhesives, polyester hot - melt adhesives, polyolefin hot - melt adhesives, etc., according to different raw materials. Currently, EVA hot - melt adhesives are the main products produced and used in China. The main raw materials of polyolefin - series adhesives are ethylene - series, SBS, and SIS copolymers.
5. Epoxy resin adhesives can bond metals to most non - metal materials and are widely used in construction, automobiles, electronics, electrical appliances, and daily household items.
6. Urea - formaldehyde resin, phenolic, and melamine - formaldehyde adhesives are mainly used in the wood - processing industry. The formaldehyde release amount after use is higher than the international standard. Wood - processing adhesives are used for medium - density fiberboard, gypsum board, plywood, and particleboard, etc.
7. Synthetic adhesives are mainly used in fields such as wood - processing, construction, decoration, automobiles, shoemaking, packaging, textiles, electronics, and printing and binding. Currently, China imports nearly 200,000 tons of synthetic adhesives every year, with varieties including hot - melt adhesives, silicone sealants, polyacrylic adhesives, polyurethane adhesives, and automotive PVC plastisol adhesives. At the same time, about 20,000 tons of synthetic adhesives are exported each year, mainly polyvinyl acetate, polyvinyl formal, and pressure - sensitive adhesives.