CAS 9003-07-0 identifies polypropylene, commonly abbreviated as PP. Polypropylene is a thermoplastic polymer made from propylene and is widely processed by injection molding, extrusion, blow molding, and fiber production. In practical terms, it combines low density, chemical resistance, moisture resistance, and useful mechanical strength, making it suitable for packaging, laboratory products, automotive components, medical items, fibers, and industrial equipment.
At Xinshangrui, we help B2B buyers evaluate polypropylene according to application, processing method, required grade, and sourcing conditions. The correct selection depends not only on the chemical name, but also on molecular structure, melt flow rate, impact requirements, additives, color, and compliance needs.
CAS 9003-07-0 is the Chemical Abstracts Service Registry Number assigned to polypropylene. Its polymer backbone is formed from repeating propylene-derived units, and its commonly represented repeat-unit formula is (C3H6)n. Because polypropylene is a high-molecular-weight polymer rather than a single small molecule, its commercial properties vary with molecular weight, chain structure, catalyst system, additives, and processing history.
Polypropylene is normally supplied as pellets or granules for conversion into finished products. It is a semi-crystalline thermoplastic, so it can be softened by heat and shaped through industrial processing, then solidified during cooling. Its relatively low density is typically around 0.90–0.91 g/cm3, although the exact value changes with grade, fillers, and formulation.
Polypropylene offers a useful balance between weight, stiffness, chemical resistance, and processability. It generally resists water, dilute acids, dilute bases, and many common chemicals, but performance depends on concentration, temperature, exposure time, and the specific chemical environment. Polypropylene also has low moisture absorption compared with many engineering plastics, which supports dimensional stability in humid operating conditions.
Most unfilled polypropylene grades melt within approximately 160–170°C, while the recommended processing window depends on grade, equipment, and product design. PP can retain useful stiffness at moderate temperatures, but its impact resistance may decrease in cold environments, especially for some homopolymer grades. Long-term use near the upper temperature limit should be evaluated through application-specific testing rather than assumed from the melting point alone.
Polypropylene is naturally non-polar and has relatively low surface energy. This can make printing, painting, bonding, and other surface treatments more difficult than with some polar plastics. Corona treatment, flame treatment, plasma treatment, primers, or specially formulated additives may be required when strong adhesion or durable decoration is important.
Polypropylene homopolymer contains primarily propylene-based polymer chains and is commonly selected when higher stiffness, hardness, and strength are important. It is used in rigid packaging, household products, appliance parts, caps, sheets, and molded industrial components. Its impact performance can be more limited at low temperatures than that of many copolymer grades.
Random copolymer PP incorporates a small amount of another comonomer, commonly ethylene, into the polymer chain. This structure can improve clarity, flexibility, and low-temperature impact performance compared with a standard homopolymer, although the exact balance depends on the grade. It is often considered for transparent packaging, food containers, medical packaging, and products where a softer appearance or improved toughness is desirable.
Impact copolymer PP contains a dispersed rubber phase or related copolymer structure that improves impact resistance. It is frequently used for automotive parts, crates, storage containers, appliance components, and industrial housings that may experience shocks or drops. Buyers should confirm whether the grade prioritizes impact strength, stiffness, flow, appearance, or a specific temperature range.
Polypropylene can be modified with mineral fillers, glass fiber, pigments, flame-retardant systems, nucleating agents, antistatic additives, UV stabilizers, or other compounds. Filled and reinforced grades can improve stiffness, dimensional stability, or heat performance, but they may also increase density, affect flow, and change surface appearance. For outdoor or demanding applications, the additive package and environmental exposure should be reviewed together.
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Packaging is one of the largest application areas for polypropylene. PP is used in films, woven sacks, bottles, caps, closures, tubs, food containers, and protective packaging because it combines low weight, moisture resistance, and scalable processing. The required grade depends on whether the product is injection molded, thermoformed, blown, or converted into film.
In the automotive industry, polypropylene is used for interior trim, battery cases, bumpers, air ducts, housings, and other molded components. Impact-modified or filled grades may be selected when a part requires greater toughness, stiffness, or dimensional control. Automotive applications normally require detailed specifications for mechanical properties, appearance, odor, temperature exposure, and process consistency.
Polypropylene is also common in medical and laboratory products, including trays, containers, sample vessels, syringes, and selected disposable components. The appropriate grade must be evaluated for the intended contact environment, sterilization method, extractables requirements, and applicable regulatory framework. We recommend treating compliance and validation as part of material selection rather than as an afterthought.
Other industrial uses include pipes, tanks, pump components, filter housings, sheets, fibers, ropes, nonwoven fabrics, and chemical-resistant linings. PP fibers and nonwovens are used in hygiene products, geotextiles, filtration, furniture materials, and industrial fabrics. The correct formulation depends on strength, flexibility, UV exposure, chemical contact, surface finish, and processing method.
Start by identifying the manufacturing process. Injection molding generally requires a melt flow rate suitable for the part geometry and cycle conditions, while film, fiber, sheet, and extrusion grades may require different flow and molecular-weight characteristics. A grade that performs well in one process may not provide the desired balance of flow, strength, or appearance in another.
Important purchasing specifications may include melt flow rate, density, tensile strength, flexural modulus, impact strength, shrinkage, color, ash or filler content, and thermal properties. Melt flow rate is often reported in g/10 min, but its test load and temperature must also be checked because results are not comparable when test conditions differ. For a meaningful quotation, we ask buyers to provide the target process, product dimensions, operating environment, and required documentation.
| Selection Factor | Why It Matters |
|---|---|
| Polymer type | Determines the starting balance of stiffness, toughness, clarity, and flexibility. |
| Melt flow rate | Influences filling, extrusion behavior, cycle time, and part performance. |
| Additives or fillers | Can change UV resistance, stiffness, color, conductivity, flame behavior, or density. |
| End-use environment | Defines exposure to heat, chemicals, impact, moisture, sunlight, or repeated flexing. |
| Documentation | Supports internal approval, quality control, traceability, and customer requirements. |
At Xinshangrui, we support B2B buyers by clarifying the required polypropylene type before discussing supply. We can review the intended application, processing method, target specifications, packaging preference, order quantity, and destination-market documentation. This approach helps reduce the risk of selecting a material that is technically suitable in general but unsuitable for a particular production process.
For an efficient inquiry, please provide the application, processing equipment, preferred PP type, required melt flow range if available, color or additive requirements, estimated quantity, and destination country. We can then help organize the relevant product information and discuss practical supply options as a chemical reagents and polymer supplier.
CAS 9003-07-0 is polypropylene, a versatile thermoplastic used across packaging, automotive, laboratory, medical, textile, construction, and chemical-handling industries. Its performance varies substantially between homopolymer, random copolymer, impact copolymer, and modified grades, so the CAS number alone is not sufficient for final purchasing approval. The next step is to match the polymer structure and specification with the manufacturing process and service environment.
Contact Xinshangrui with your application and purchasing requirements for a focused polypropylene evaluation. We can help you compare grade options, confirm technical information, and plan the next stage of your B2B sourcing process.
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