塑料原料供应商
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Key plastic raw material categories for B2B procurement
The commodity thermoplastics that account for the majority of B2B plastic raw material trade are: polypropylene (PP), high-density polyethylene (HDPE), low-density polyethylene (LDPE) and linear low-density polyethylene (LLDPE), polyethylene terephthalate (PET), polyvinyl chloride (PVC), and polystyrene (PS). Each resin family has multiple grades differentiated by melt flow index (MFI), density, molecular weight distribution, and additive packages — and grade selection directly determines processing performance and end-product properties. Beyond commodity grades, specialty materials including engineering plastics (ABS, PC, nylon, acetal), biodegradable polymers (PLA, PBAT), and recycled-content resins (rPET, rHDPE, rPP) serve specific application requirements. China, the United States, South Korea, and the Middle East (SABIC, EQUATE, Borouge) are the primary resin export origins.
What to verify before placing a plastic resin order
Before confirming a plastic raw material order, request the following documentation: a Certificate of Analysis (CoA) confirming MFI, density, tensile strength, and relevant property values for the grade; the Material Safety Data Sheet (MSDS/SDS); REACH compliance declaration for EU-destined material, confirming the absence of SVHCs above 0.1% by weight; food contact Declaration of Compliance where required (EU Regulation 10/2011 or FDA 21 CFR); and origin documentation (Certificate of Origin, packing list, commercial invoice). For recycled-content resins, also request the input material declaration, contamination testing data, and Global Recycled Standard (GRS) certification if recycled content claims are required for your market. Verify the supplier's ISO 9001 certification and, for food or medical applications, additional sector-specific certifications. Payment terms for commodity resin are typically open account (for established buyers) or Letter of Credit for new supplier relationships.
Packaging formats and minimum order quantities
Thermoplastic resins are supplied in three main packaging formats: 25kg bags (paper or woven PP), big bags (jumbo bags / FIBC, typically 500–1,000kg), and bulk tanker or railcar (for very high volume, typically 20+ tonnes per delivery). For container-load imports, most suppliers require one FCL as the minimum order — a 20ft container holds approximately 20–25 metric tonnes of granules depending on bulk density. For smaller B2B orders below FCL volume, some trading companies and distributors offer LCL options at a higher unit price. For recycled grades and specialty compounds, MOQs may be lower — particularly for compounders producing to order.
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在Towobo上查找塑料原料供应商Frequently asked questions
What is melt flow index (MFI) and why does it matter for resin selection?
Melt flow index (also called melt flow rate, MFR) measures how easily a polymer flows when melted — expressed in grams per 10 minutes at a standard temperature and load. A higher MFI means lower viscosity and easier flow, which suits thin-wall injection moulding. A lower MFI means higher viscosity and greater melt strength, which suits blow moulding, pipe extrusion, and film. Specifying the wrong MFI grade for your process results in processing problems (short shots, melt fracture, poor surface finish) and inconsistent part dimensions. Always confirm MFI in the Certificate of Analysis before accepting a resin delivery.
What is the difference between virgin and recycled plastic granules?
Virgin plastic granules are manufactured from primary petrochemical feedstocks and have consistent, predictable properties with no prior processing history. Recycled plastic pellets are produced from post-consumer or post-industrial waste plastic — they may have reduced mechanical properties, colour variation, and occasional contamination depending on input quality and washing process. Recycled grades are increasingly specified for packaging and non-critical applications where recycled content requirements apply. For food-contact, medical, or high-precision applications, virgin grades are typically required.
How do I compare plastic resin suppliers from different origins?
Request CoA data from multiple suppliers for the same grade and compare MFI, density, and tensile properties against your processing specifications. Verify certifications — REACH, food contact compliance, and ISO 9001 are non-negotiable for most B2B buyers. Compare total landed cost including freight, duties, and any inspection or certification costs. For Chinese suppliers, request an SGS or Intertek pre-shipment inspection. For Middle Eastern or US suppliers, confirm available shipping schedules to your port. Towobo supplier profiles display available certifications and allow direct quote requests.
Are plastic raw material prices fixed or negotiable?
Commodity thermoplastic prices track petrochemical feedstock prices (naphtha, ethylene, propylene) and fluctuate with oil markets, regional supply-demand, and seasonal factors. Most B2B suppliers quote on a per-tonne basis and prices are negotiable, particularly for larger volumes or longer-term contracts. Spot and contract pricing are both available — contract pricing provides stability but commits volume; spot pricing suits flexible procurement but exposes the buyer to market volatility.
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