What are the specific materials used in the PVC coating or laminate (e.g., PVC resin, polyester fabric base)?

The specific materials used in PVC tarpaulin typically include:

PVC Resin (Polyvinyl Chloride):

PVC resin forms the base polymer of the tarpaulin. It provides the waterproofing and durability properties that PVC tarpaulins are known for. PVC resin is formulated with additives to achieve desired characteristics such as flexibility, UV resistance, and color stability.
Polyester Fabric Base:

A polyester fabric base is commonly used as the reinforcement layer in PVC tarpaulin. This fabric provides strength and stability to the tarpaulin structure. The polyester fabric is coated or laminated with PVC resin to form a strong composite material.
Additives:

Various additives are mixed with PVC resin to enhance specific properties of the tarpaulin. These additives may include:
Plasticizers: Improve flexibility and ease of handling, especially in cold temperatures.
Stabilizers: Protect against degradation from UV light and heat.
Fillers: Enhance strength and reduce cost.
Pigments: Provide color to the tarpaulin and improve UV resistance.
Biocides: Prevent growth of mold and mildew.
Flame Retardants: Improve fire resistance in certain applications.
Coating/Lamination Process:

The PVC resin is typically applied to both sides of the polyester fabric base through a coating or lamination process. This process ensures that the PVC completely encapsulates the fabric, forming a waterproof barrier that is strong and durable.
Fabric Weight and Density:

The weight (measured in grams per square meter, GSM) and density of the polyester fabric base vary depending on the intended use and required strength of the tarpaulin. Higher GSM fabrics are generally thicker and more durable.
Other Components:

Depending on the specific requirements of the tarpaulin, additional components such as reinforcing mesh layers, anti-slip coatings, or special finishes may be incorporated to enhance performance in particular applications.
These materials and components work together to create PVC tarpaulin products that are versatile, durable, and suitable for a wide range of applications including outdoor covers, tents, truck tarps, and industrial use where waterproofing and durability are essential.