Blog Details

Essential Tips for Buying Recycled LDPE Granules or Flakes

As environmental concerns and sustainability efforts grow, the demand for recycled materials in manufacturing processes has increased.

Products such as gypsum composites and wood composite boards are starting to use recycled plastic pellets or shredded low-density polyethylene (LDPE) as raw materials.

However, before purchasing recycled LDPE, it is important for manufacturers to understand several key aspects to ensure the quality so that the raw material you buy meets your needs.

1. Source and Quality of Recycled LDPE

Material Source

Recycled LDPE granules and flakes come from various sources, including post-consumer waste (e.g., discarded gallon water cap) and post-industrial waste.

Understanding the source of the recycled LDPE can provide insights into its quality and potential contaminants.

For example, LDPE waste collected from streets and refuse dumps. This waste requires intensive cleaning to remove dirt which can reduce the quality of recycled LDPE.

Quality Assessment

Quality can vary significantly between different batches of recycled LDPE. It is crucial to check for the presence of contaminants and ensure that the material has been adequately cleaned and processed.

High-quality recycled LDPE should have minimal impurities and consistent granule or flake size.

Utilizing standardized testing methods, such as sieve analysis, can help determine the particle size distribution and ensure uniformity.

Langgeng Jaya Group provides high-quality rLDPE granules to meet your needs. Click here to get the best price rLDPE granules from Langgeng Jaya.

2. Compatibility with Other Materials

Interfacial Bonding

The compatibility between recycled LDPE and other materials, such as wood particles in composite boards, is crucial for achieving good interfacial bonding.

Poor bonding can result in weaker mechanical properties. Studies using scanning electron microscopy (SEM) have shown that effective compounding and processing parameters can enhance bonding between LDPE and other materials.

Ensure that the recycled LDPE you purchase is compatible with your intended matrix material.

3. Environmental and Health Considerations

Water Absorption and Hygroscopicity

Understanding the water absorption and hygroscopic properties of recycled LDPE is important. Especially if your product has the potential to be exposed to moisture.

Research has shown that increasing the LDPE content in composites can significantly reduce the water absorption and adsorption capacity, making the material more resistant to moisture.

Volatile Organic Compounds (VOCs)

One of the advantages of using recycled LDPE over traditional resins, such as urea-formaldehyde, is the reduction in VOC emissions.

Formaldehyde, commonly used in industrial processes, can cause health issues and contribute to poor indoor air quality.

Recycled LDPE can provide a safer alternative, but it's essential to verify that the recycled material does not introduce other harmful substances.

4. Processing Parameters

Temperature, Pressure, and Time

The processing parameters used during the manufacturing of composite materials with recycled LDPE can significantly impact the final product's properties.

Optimal temperature, pressure, and time settings are necessary to achieve the desired mechanical strength and uniformity.

For example, composite boards produced at 140°C with specific wood/LDPE ratios demonstrated superior properties in studies.

Ensure that you have access to the appropriate equipment and process control to achieve the best results.


Before purchasing recycled LDPE flakes or granules, it is important that you consider the source and quality of the material, evaluate its mechanical and physical properties, ensure compatibility with other materials, and understand the environmental and health implications.

Likewise, finding a trusted manufacturer like Langgeng Jaya Group is very important. Click here for more information about high quality recycled rLDPE plastic granules

By thoroughly investigating these factors, you can make an informed decision and successfully integrate recycled LDPE into your manufacturing process.

Chat on WhatsApp