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Polypropylene (PP) granules and powders are versatile thermoplastic materials known for their excellent combination of strength, chemical resistance, thermal stability, and ease of processing. At Alfa Chemistry, we offer a full range of PP materials, from millimeter-sized granules to ultra-fine powders down to 500 nm, catering to research, small-scale production, and specialty applications like microspheres, 3D printing, and material modification.
Our products are designed for small-batch flexibility, suitable for laboratories, pilot-scale work, and innovative manufacturing, with options for virgin and recycled grades, various particle size distributions, and custom processing to meet your specific needs.
PP is a thermoplastic polymer formed by the addition polymerization of propylene monomers, with a molecular formula of C3H6. Known for its low density (approximately 0.91 g/cm3), it is the lightest of all general-purpose thermoplastics. It combines the following characteristics:
Crystallinity
Partially crystalline with a high degree of crystallinity, intermediate between LDPE and HDPE.
Chemical Stability
Resistant to acids, alkalis, most solvents, and saline solutions.
Processability
Suitable for injection molding, extrusion, blow molding, thermoforming, and powder-based forming.
Balanced Physical Properties
Good strength, toughness, wear resistance, and electrical insulation.
Cost-effectiveness
A balance of material economy and sustainable options (recycled PP) is emphasized.
Production routes can involve Ziegler-Natta or metal coordination catalysis systems, and chain structures can range from isotactic to random and syndiotactic. Different microstructures significantly influence crystallinity, stiffness-toughness balance, and processing window.
Compared to polyethylene (PE)
PP surpasses PE in hardness, heat resistance, and mechanical strength, while also maintaining good chemical stability.
Compared to polyamide (PA)
PP offers better chemical resistance and lower moisture absorption but slightly lower abrasion resistance and strength.
Similarities to PE
Both are lightweight and highly corrosion-resistant, but PP offers significantly better heat resistance.
| Product Type | Catalog | Product | Price |
| Granules | PL-PP-A037 | PP Granule (3 mm granule size) | Inquiry |
| PL-PP-A038 | PP Granule (4 mm granule size) | Inquiry | |
| Powders | PL-PP-A039 | PP Powder (20 mesh) | Inquiry |
| PL-PP-A040 | PP Powder (30 mesh) | Inquiry | |
| PL-PP-A041 | PP Powder (100 mesh) | Inquiry | |
| PL-PP-A042 | PP Powder (300 mesh) | Inquiry | |
| PL-PP-A043 | PP Powder (1000 mesh) | Inquiry | |
| PL-PP-A044 | PP Powder (2000 mesh) | Inquiry | |
| PL-PP-A045 | PP Powder (500 nm) | Inquiry |
*Note: The conversion between "mesh size" and particle size varies by standard. The above are nominal mesh specifications. If you require actual particle size distribution (PSD) or flowability/bulk density parameters, please request test data when inquiring.
Available Packaging: Small-scale packages starting from 10g, 50g, 100g, up to 1kg — ideal for laboratory research and product development.
Explore our broader PP portfolio to match your unique processing and performance requirements!
Ready to start your project? Contact us for samples, technical consultation, and custom solutions.
Online Inquiry
High strength, excellent chemical resistance, heat stability and easy processing, suitable for a wide range of processes such as injection molding, extrusion, blow molding, and additive manufacturing.
Granules (approx. 3-5 mm) and powders (20-2000 mesh, up to 500 nm) are available in a wide range of sizes, covering different scenarios from molding to surface coating/filling.
Low MOQ, fast response, mixed orders, project-based supply and volume release.
Material selection and basic process advice for formulation development, microsphere/powder handling, 3D printing and modification applications.
R&D and Formulation Prototyping
3D Printing/Additive Manufacturing
Microsphere/Particle Preparation
Functional Composites
End-use Component Prototyping
Toughening/nucleating/flame-retardant masterbatch matrices, pilot extrusion and injection molding validation.
Exploration of powder bed processes such as SLS/material jetting/thermal condensation, and research on modified filament raw materials for FDM.
Matrix materials using routes such as spheroidization/emulsification-solvent evaporation/spray drying.
Composites with inorganic fillers (such as talc and SiO2), fibers, or flame-retardant/antibacterial/thermal conductive additives.
Rapid validation of packaging sheets, films, automotive/appliance small parts, electronic housings, and building materials.
Injection Molding/Extrusion/Blow Molding
Granular grades are recommended. If improved filler dispersion or surface finish is required, 100–300 mesh powders can be added as a blending or coating substrate.
Powder Bed Additive Manufacturing
The 300–2000 mesh range is preferred, focusing on powder sphericity, particle size distribution, and surface energy/hygroscopicity. Custom surface treatments can be used to improve spreading and densification if necessary.
Microsphere Preparation/Coating
1000–2000 mesh and 500 nm grades are more conducive to forming uniform films or submicron structures. Solvent/non-solvent or emulsion systems can be used.
Modification and Compounding
Compatibility studies with nucleating agents, toughening agents, flame retardants, and other systems are recommended. If interfacial compatibility is a concern, compatibilization strategies such as maleic anhydride grafting can be explored (customization available upon request).
Drying and Storage
PP has low hygroscopicity but a large specific surface area. It is recommended to store it in a dry and inert environment and avoid prolonged exposure to high humidity and static electricity. After opening, try to use it up or seal it as soon as possible.
Alfa Chemistry offers flexible and professional custom polypropylene granules and powders, producing everything from millimeter-sized granules to nano-sized powders on demand.
Our technical team will arrange testing and provide detailed reports based on project requirements to ensure our customers receive the PP material solution that best suits their process and performance requirements.
A university polymer engineering lab ordered 2 kg of PP granules (3 mm) for evaluating the mechanical properties of PP composites with natural fiber reinforcement. The granules were processed via small-scale injection molding, and the students compared tensile strength before and after adding different coupling agents.
Customer Feedback:
"The granules had consistent melt flow behavior, which helped us isolate the effect of fiber content in our composite study. The small-batch availability saved us from overstocking materials."
A start-up specializing in functional prototyping purchased PP powder (300 mesh) for SLS (Selective Laser Sintering) experiments aimed at creating lightweight automotive interior components. The powder exhibited good flowability and produced parts with minimal warpage after printing.
Customer Feedback:
"The powder’s uniform particle size distribution improved our powder spreading consistency, and the parts showed excellent dimensional stability. Delivery was quick, and the small quantity was perfect for our prototype testing stage."
A research institute developing microsphere-based antimicrobial coatings requested custom PP powder (~500 nm) to act as the base polymer in a solvent evaporation process. Alfa Chemistry supplied the powder with a controlled PSD and pre-dried packaging to prevent agglomeration.
Customer Feedback:
"The custom particle size was exactly as specified, and the powder dispersed easily in our solvent system. The technical team’s advice on storage helped us maintain material stability throughout the project."
A packaging R&D group ordered recycled PP granules (4 mm) for developing eco-friendly rigid containers. The goal was to evaluate performance trade-offs between virgin and recycled grades under identical molding conditions.
Customer Feedback:
"The recycled PP had stable processing characteristics and acceptable mechanical performance for non-critical packaging applications. The flexibility to purchase just a few kilograms allowed us to run a complete trial without waste."
* You can reach out to us for additional product information or technical support.
I only need a small amount of powder for my experiment. Is this supported?
Yes. We offer flexible supply from gram-scale to small batches for smaller customers, and we can split and package as needed.
What are the key specifications for SLS powder?
In addition to particle size distribution, powder morphology, flowability, thermal behavior, and hygroscopicity are more critical. We can provide basic characterization and discuss customized treatments to improve powder spreading stability and densification.
What is the correspondence between mesh size and micrometers?
Different standards vary. Mesh size is only a reference for sieve specifications.
Can you provide polypropylene in both granule and powder forms for the same project?
Yes. We can supply both PP granules and powders in one order, enabling you to run multiple processing trials using materials with consistent base properties but different particle sizes.
How fine can your PP powders be?
Our range extends from coarse powders (20 mesh) to ultra-fine grades down to approximately 500 nm. PSD can be tailored on request to meet specific process or performance needs.
Alfa Chemistry is a global leader in the field of plastics. Working with us, you will enjoy outstanding quality products and services at competitive prices.
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