Sourcing Chinese HDPE for Blow Molding — And Why 5000S Is the Wrong Grade to Ask For

Summary: "HDPE 5000S" is a raffia / monofilament grade (indicative MFI ~0.8 g/10min, density ~0.953 g/cm³) used for woven sacks, FIBC, rope, and nets — not a blow molding grade. Yet "5000S for blow molding" is one of the most common Chinese-HDPE sourcing requests, and it is the wrong grade to ask for. If you need to blow-mold jerry cans, bottles, or drums, specify a dedicated blow molding grade — in Chinese supply, HDPE 5502 (Sinopec) is the mainstream reference, indicative MFI ~0.25-0.35, density ~0.954-0.955. All specifications here are indicative; confirm MFI, density, and ESCR against the producer's COA/TDS for your lot. Order by application and verified spec, never by the bare code.

A buyer needs HDPE for 20-liter jerry cans. A trader, or a half-remembered spec sheet, points them at "HDPE 5000S" — a code they have seen quoted, cheaply, from several Chinese producers. They request it for blow molding. The quote comes back; the resin lands; the line struggles. The parison sags, wall thickness wanders, and the parts that do form crack at the handle months later in the field.

The root error is not on the processing line. It is upstream, in the grade code itself. HDPE 5000S is not a blow molding grade. It is a raffia / monofilament grade — engineered to be drawn into flat tape and filament, not to hold a stable parison. The two applications pull resin design in different directions, and a grade tuned for one is a poor substitute for the other.

This guide does two things. First, it states plainly what 5000S actually is, so the misconception stops compounding from one trader quote to the next. Second, it points blow-molding buyers to the grades they should genuinely specify — what to ask for, what to verify, and how to keep a trader's loose grade label from putting the wrong resin in your hopper.

Chinese HDPE grade naming is less systematized than PP, and "5000S" is not strictly standardized across producers. Its dominant meaning in trade is a raffia / monofilament grade: a low-melt-flow HDPE whose value lies in draw-down strength, not parison control.

Indicative specification window (confirm against the producer's COA/TDS for your lot — these figures are indicative, not from a single producer's published datasheet):

Why the confusion is so common: 5000S is a high-volume, widely-quoted commodity grade, the "5000" family numbering looks adjacent to blow grades, and a buyer who knows the application better than the resin will accept a cheap, available code at face value. The fix is mechanical — order by application and verified spec, not by the bare number — and it starts with knowing that 5000S belongs in a woven sack, not a jerry can.

For mainstream Chinese HDPE blow molding, the common reference grade is HDPE 5502, produced by Sinopec (including at its Maoming complex in Guangdong). It is a single low-melt-flow blow molding grade — there is no "AA/LW/GA" sub-family to choose between; specify 5502 and verify the datasheet.

Indicative specification window for HDPE 5502 (indicative — confirm against the producer's COA/TDS for your lot):

A blow molding grade is designed for the opposite end of the processing problem from raffia. Raffia resin is drawn and oriented; blow molding resin must hold a hanging parison without sagging and weld cleanly at the pinch-off. That is why melt strength and the high-load behavior of the resin (often read through HLMI, the high-load melt index) matter more here than the simple MFI number — and why a raffia grade, even at a similar headline density, is the wrong tool.

On "7260": if you have seen a "7260" referenced alongside these grades, the genuine grade by that number is LyondellBasell Hostalen GC 7260 — an injection molding grade (indicative MFI ~8 g/10min, density ~0.960), not a Chinese blow or film grade. Do not specify "7260" expecting Chinese blow molding material; it points somewhere else entirely.

For standard industrial blow molding — lubricant and motor-oil bottles, water containers, basic detergent bottles, general-purpose jerry cans — a verified Chinese blow molding grade is a cost-competitive alternative to many Saudi, Korean, and Western reference grades. The headline properties (density, melt flow) are broadly comparable, and the savings on commodity volume are real.

The honest caveat is at the demanding end. For ESCR-critical applications — long-shelf-life agrochemicals, aggressive solvents, large-volume drums, and IBC inner liners — the relevant Western and Middle Eastern benchmarks are bimodal grades such as Borouge BB1530 and Q-Chem TR-571 (Lotrene). Bimodal resin distributes molecular weight to maximize stress-crack resistance, and a standard monomodal Chinese (or any monomodal) grade may fall short. Chinese bimodal blow grades exist, but export availability and published documentation are harder to confirm — so for these applications, ask your supplier for the specific bimodal grade designation and its ESCR data rather than accepting a generic grade label.

The practical line: match the grade to what the container holds and how long it sits. Most blow molding demand is standard, where Chinese 5502-class material competes well; the bimodal premium is worth paying only where ESCR is structurally critical.

1-5L bottles (motor oil, household chemicals): A standard Chinese blow molding grade (5502-class) covers this. ESCR is rarely the binding constraint at this size. Verify MFI against your line's calibration window.

5-25L jerry cans (lubricants, industrial chemicals): A standard blow molding grade works for most contents. For aggressive contents (concentrated detergents, solvents, surfactants), specify an ESCR minimum (F50 per ASTM D1693) on the PO, and step up to a higher-ESCR or bimodal grade if the datasheet falls short.

IBC inner liners (1,000L, food-grade IBCs): A bimodal grade is preferred for stress-crack resistance. Export-grade Chinese options with published documentation are limited here; source through a channel that can confirm the specific grade and ESCR data rather than accepting "5000S" or a generic blow label.

200L industrial drums: A bimodal grade is typically required for the multi-year service life. Borouge BB1530 and Q-Chem TR-571 remain the established benchmarks. Chinese alternatives exist but export availability and ESCR documentation should be confirmed before committing.

Cosmetics / personal-care bottles: A standard blow molding grade generally meets specs. Verify color stability if recycled-content blends are involved (post-consumer blends may show yellowing).

A trader will often quote a bare grade code without naming the producer, plant, or feedstock pathway — and without confirming the grade is actually a blow molding grade. Because "5000S" does not denote blow molding material at all, specify the requirement, not the code:

1. Application, stated explicitly — "blow molding, 20L jerry can" — so you do not receive a raffia or different-process grade under a similar number.
2. The blow molding grade by name and producer — e.g., "Sinopec HDPE 5502," not "5000S" and not bare "Sinopec."
3. Target MFI with tolerance — for a low-melt-flow blow grade, e.g., "MFI ~0.25-0.35 g/10min (190°C/2.16kg)," verified against the producer's TDS.
4. HLMI / high-load behavior where available — often the more practical processability indicator for blow molding than MFI alone.
5. Density — e.g., "~0.954-0.955 g/cm³."
6. ESCR minimum (if your application demands it) — "F50 ≥ [your minimum] per ASTM D1693, Condition B."
7. Food-contact certification (if required) — "FDA 21 CFR 177.1520 and GB 4806 compliance for the specific grade and plant."
8. COA before shipment — compared field-by-field against your line's calibration window.

For ESCR-critical work, also ask whether the quoted blow molding grade is monomodal or bimodal. Standard grades are monomodal; bimodal variants carry higher ESCR and a price premium.

Is HDPE 5000S a blow molding grade?

No. HDPE 5000S is a raffia / monofilament grade — a low-melt-flow HDPE (indicative MFI ~0.8 g/10min, density ~0.953 g/cm³) drawn into tapes and filaments for woven sacks, FIBC, rope, nets, and tarpaulin. Requesting "5000S for blow molding" is one of the most common Chinese-HDPE sourcing mistakes. For blow-molded jerry cans, bottles, or drums you need a dedicated blow molding grade such as HDPE 5502, not 5000S.

What is HDPE 5000S used for?

HDPE 5000S is primarily a raffia / monofilament grade. Its low melt flow gives the draw-down tensile strength needed for flat tape and monofilament, which is why it is used for woven sacks, FIBC (bulk bags), rope, fishing and agricultural nets, and tarpaulin. It is not formulated for the parison stability that blow molding requires. Order by application, and verify MFI and density on the producer's TDS and COA per lot.

What is the MFI and density of HDPE 5000S?

Indicatively, HDPE 5000S has a melt flow index of approximately 0.8 g/10min (190°C/2.16kg) and a density of approximately 0.953 g/cm³, consistent with a raffia / monofilament grade. Treat these as indicative — exact values vary by producer and lot, and they are not drawn from a single producer's published datasheet. Request the producer's specific TDS and a current COA before committing volume.

Which Chinese HDPE grade should I use for blow molding instead of 5000S?

For mainstream Chinese HDPE blow molding, the common grade is HDPE 5502 (produced by Sinopec, including at Maoming) — a low-melt-flow blow grade with indicative MFI roughly 0.25-0.35 g/10min (190°C/2.16kg) and density roughly 0.954-0.955 g/cm³. Specify the application explicitly ("blow molding, 20L jerry can"), state a target MFI with tolerance, and confirm MFI, density, and ESCR against the producer's TDS and COA. For the most demanding stress-crack applications, a bimodal grade may be required.

How do I source the right grade if a trader quotes me "5000S" for a container?

Order by application and verified specification, not by the bare code. Chinese HDPE grade codes are not strictly standardized across producers, and "5000S" denotes a raffia grade, not blow molding material. State the application (e.g., blow molding jerry can), a target MFI with tolerance, the density, and any ESCR minimum, and require a COA before shipment so you can check each lot against your spec. If a trader insists "5000S" is fine for your bottles, treat that as a flag to verify the actual datasheet.

What is ESCR and why does it matter for blow-molded containers?

ESCR (Environmental Stress Crack Resistance, ASTM D1693) measures how well a polymer resists cracking under combined stress and chemical exposure. For jerry cans and bottles holding aggressive contents — concentrated detergents, agrochemicals, solvents, motor oil — low ESCR causes cracking at stress points (handle, base, weld line) over months of storage, long after the part leaves the line. ESCR varies by grade, producer, and lot, so specify a minimum F50 on the PO and require ESCR data on the COA. The most demanding drum and IBC-liner applications may need a bimodal grade rather than a standard monomodal one.

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Related Reading

• HDPE 5000S vs. 5502 vs. 7260: Grade Selection Guide
• Chinese PP T30S: Sinopec, PetroChina, CTO for Woven Sack
• China Polymer Producers Guide
• CTO/PDH vs. Naphtha: Why Chinese Polymers Cost Less

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This analysis covers Chinese HDPE grade selection for blow molding as of Q2 2026. Producer grades, pricing positions, and specifications can change, and the figures above are indicative rather than datasheet-exact. For current pricing on a specific blow molding grade, tell us what you need — polymer type, application, volume, and destination — and our sourcing team will respond with matched producers and current FOB pricing.

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