Materials use in plastic basin injection molding mainly are polypropylene (PP), polycarbonate (PC), high-density polyethylene (HDPE), and recycled plastic granules.

 

Selecting the right plastic basin materials is important for plastic basin injection molding. The material directly determines the plastic basin’s impact resistance, surface finish, and service life. Also it affects production efficiency and costs. Improper material selection may lead to issues such as warping, cracking, or premature aging of the product. This results in significant economic losses and low production cycle efficiency.

• Polypropylene (PP): offers good impact resistance, strong mechanical properties, and resistance to acids and alkalis. It works well for standard plastic bathroom basins and kitchen basins. PP is the most common choice for household basins because it balances performance and cost.
• Polycarbonate (PC): provides high transparency and hardness. Manufacturers choose PC for premium plastic basins that need a clear, glass-like appearance. PC also offers excellent heat resistance and dimensional stability.
• Recycled materials: are becoming more common because they lower production costs. Many basin makers now use recycled PP from post-industrial or post-consumer sources. Recycled PP costs about 5-6000 yuan per ton, while virgin material costs over 8000 yuan.

Material choice affects machine settings. PP needs moderate injection pressure and a melt temperature around 200-230°C. PC requires higher temperatures, typically 260-300°C. HDPE needs temperatures around 230-260°C. Recycled materials vary in melt flow and may contain impurities. They may need a bi-metallic screw to prevent wear and a melt filtration system to remove particles. Each material also affects cooling time and cycle efficiency.

At Haichen, we understand the importance and know these differences. We have over 10 years of experience in the whole producing process of plastic basins. Our plastic basin injection molding machines handle all these material types efficiently. This flexibility helps customers switch between virgin and recycled resins without changing equipment.

PP for Standard Plastic Basin

• PP material properties

• Benefits for basin production

• Processing requirements

PP material properties

Polypropylene (PP) is semi-crystalline and lightweight. Its density ranges from 0.89 to 0.91 g/cm³. PP provides good impact resistance and strong mechanical properties. The material also offers resistance to acids and alkalis. PP does not absorb much moisture, so pre-drying is often unnecessary.

Benefits for basin production

PP basins resist cracking under repeated stress. The material also handles temperatures from 0°C to 80°C. For this reason, PP works well for standard household basins. Cycle times are short because PP cools quickly. PP is also one of the most cost-effective materials for basin production.

Processing requirements

The material PP melts at 200-230°C. The injection pressure needed is moderate. Cooling time is relatively short, so cycle times stay low. PP’s shrinkage rate is moderate, so mold design must account for this. Haichen HCK series machines provide precise temperature control for consistent PP processing. We supply professional household plastic water basin injection molding machine

PC for Premium Transparent Plastic Basin

• PC material properties

• Benefits for premium basins

• Processing requirements

PC material properties

Polycarbonate (PC) is an amorphous thermoplastic with exceptional impact strength. Its transparency allows for clear, glass-like basins. PC also offers high heat resistance and excellent dimensional stability. The material can withstand temperatures up to 135°C without significant deformation.

Benefits for premium basins

PC basins have outstanding impact strength even at low temperatures. The high transparency gives a premium appearance that appeals to high-end markets. PC also maintains its shape under varying temperatures and loads. This makes PC suitable for basins that need both strength and aesthetics.

Processing requirements

During production process, PC requires a melt temperature of 260-300°C. The injection pressure ranges from 80-150 MPa, higher than PP. Proper drying of the resin is essential to prevent hydrolysis. PC also requires higher mold temperatures, typically 80-120°C, compared to PP. Cooling time is similar to PP but requires careful control to prevent stress marks.

 

HDPE for Heavy-Duty Outdoor plastic Basin

• HDPE material properties

• Benefits for outdoor basins

• Processing considerations

HDPE material properties

High-density polyethylene (HDPE) is a general-purpose high-density polyethylene with good rigidity and high melt flow. Its density ranges from 0.94 to 0.96 g/cm³. HDPE offers excellent chemical resistance and durability. The material is specifically developed for injection molding applications like basins and pails.

Benefits for outdoor basins

HDPE provides excellent weather resistance and UV resistance. This makes it suitable for garden basins and outdoor wash stands. The material resists corrosion from chemicals and moisture. HDPE basins last longer under rough use and outdoor conditions.

Processing considerations

HDPE requires a melt temperature of 230-260°C. The material has good processability with a low tendency to warpage. HDPE’s higher shrinkage requires careful mold design. Cooling time is longer than PP, but the final product is more durable. A 300-500 ton machine is typical for standard HDPE basin molds.

Recycled Materials for Plastic Basins

• Types of recycled resins

• Equipment adjustments needed

• Quality considerations

Types of recycled resins

Post-industrial scrap is cleaner and more consistent. Post-consumer recycled material costs less but may contain contaminants. Common sources include packaging waste and industrial offcuts. In practice, most manufacturers in Shandong and Yiwu choose recycled PP because of lower costs.

Equipment adjustments needed

Recycled materials often contain fillers or impurities. A bi-metallic screw and barrel resist wear from these contaminants. Melt filtration systems help remove particles before injection. For basins using recycled material, manufacturers often recommend cold runner systems rather than hot runners. Cold runners are less likely to get blocked by impurities in the recycled material.

Quality considerations

Recycled resins have lower melt flow consistency. This can affect fill time and part strength. Mixing recycled material with virgin resin improves stability. A ratio of 30% recycled to 70% virgin often works well for basins. Manufacturers requiring high quality stability prefer virgin materials for processing.

Why Material Selection Matters for Plastic Basin Production

• Material decides basin strength

• Material decides production speed

• Material affects total cost

Material decides plastic basin strength

Different plastics give different strength levels. PP provides good impact resistance for standard basins. PC offers higher strength and impact resistance for premium basins. The wrong material can make basins crack under normal use. So matching material to the basin’s intended use is very important for product quality.

Material decides production speed

Each material needs specific temperature and pressure settings. PP melts fast and cools quickly, so cycle times stay short at 15-20 seconds. PC requires higher injection pressure and careful temperature control, so cycle times may be longer. HDPE needs longer cooling time, so production per hour is slower. Recycled materials can have uneven flow, and this may cause longer injection times.

Material affects total cost

Virgin PP and PC cost more per kilogram. Recycled PP costs 20-40% less, with a typical price of 5-6000 yuan per ton compared to 8000+ yuan for virgin material. But recycled material may cause more machine wear. This leads to higher maintenance costs over time. The proper plastic basin injection molding materials are the import part of Plastic Basin Production Line price. The best choice balances raw material price, production efficiency, and machine life. 

How Haichen Machinery Optimizes Material Processing

• Custom screw designs for each material

• Real production examples

• Technical support for material selection

Haichen has over ten years of experience in plastic basin injection molding. Our plastic wash basin making machines match specific material requirements. Our technical team helps customers know from how to make the plasic basin for their application.

Custom screw designs for each material

PP needs a general-purpose screw with standard compression ratio. PC requires a special screw with higher torque capacity to handle the higher injection pressure. HDPE needs a barrier screw with deeper flights for better melting. Recycled materials work best with a bi-metallic screw that resists abrasion.

Real production examples

A basin manufacturer uses Haichen HCK 280 with PP material. Each basin measures 340x130x270mm. Cycle time is 15 seconds per part. Production is about 5,000 basins per 20-hour day.

Another customer produces transparent PC basins on Haichen HCK 310. The same size PC basin needs 18-second cycle time due to different cooling characteristics.

A third customer uses recycled PP on Haichen HCK 250. Each basin weighs 500g. Cycle time is 16 seconds.

We will help you to know How to Choose the Right Injection Molding Machine for Large Plastic Basins?

Technical support for material selection

Haichen offers free material consulting. We analyze your product requirements and recommend the best resin. Our team also suggests machine settings for each material type. For customers using recycled materials, we recommend appropriate filtration systems and runner designs to prevent nozzle blockage.

PP, PC, HDPE, and recycled resins are the main materials for plastic basin injection molding. PP works for standard household basins with 15-20 second cycles. PC suits premium basins requiring high transparency and impact strength. HDPE works well for outdoor basins with better weather resistance. Recycled materials lower production costs by 20-40%. Each material needs specific machine settings and screw designs.

Haichen Machinery provides customized solutions for all material types. With over ten years of experience, we help customers achieve efficient basin production.

We will instruct you plastic basin clamping unit troubleshooting guide and supply relative service.

Contact us for help selecting the right machine for your plastic basin  material.