Grade Cross-Reference · Engineering Plastics

Ultramid A3WG6 Alternatives: Chinese PA66 GF30 Grades Reviewed

Published 2026-09-02 · Data sources listed at the end of this page

Quick Answer

Several Chinese PA66 GF30 grades are workable Ultramid A3WG6 substitutes for general heat-stabilized applications — but if your part is a radiator end tank, oil-gas separator, or any long-term coolant-contact component, the substitution question is not "PA66 GF30 vs PA66 GF30." It is "hydrolysis-stabilized vs not."

Most Chinese PA66 GF30 on the market is a standard heat-stabilized compound, and a standard grade in a glycol/water coolant circuit at 100+ °C will hydrolyze and lose properties within months. Chinese producers do offer explicitly hydrolysis-resistant, end-tank-positioned grades — PRET Technyer D222-G30HR, Nanjing Julong AG6BK-S01, Kingfa PA66-G30 SR, and CGN Juner B1G6-TS — and their headline dry-state properties match A3WG6 closely. The honest gap is not in the datasheet; it is in long-term coolant-aging data and OEM approvals, where Chinese grades carry far less public evidence than BASF's HR-series. Details and verification steps below.

The Hydrolysis Gap: Why "PA66 GF30" Is Not a Specification

One clarification first, because it changes how you should read supplier offers: standard Ultramid A3WG6 is itself a heat-aging-stabilized grade, not a hydrolysis-stabilized one. BASF's current official description is "glass fibre reinforced and heat aging resistance injection moulding grade" for high-stiffness parts; the US-edition TDS lists "water containers for automotive cooling systems" among typical applications, but for sustained coolant exposure BASF's own answer is its hydrolysis-resistant family — Ultramid A3WG6 HRX ("enhanced resistance to hydrolysis and heat ageing… for applications in the automotive cooling circuit") and A3HG6 HR, which carry OEM material approvals such as Ford WSK-M4D752-A / WSS-M4D752-B1 and GM GMW16270P-PA66-GF30.

So the substitution ladder has two rungs:

Rung 1 — Heat-Stabilized Duty

Air-side engine parts, housings, fans, brackets: a standard Chinese heat-stabilized PA66 GF30 is a legitimate candidate, and dry-state properties are directly comparable (table below).

Rung 2 — Coolant-Contact Duty

Radiator end tanks, thermostat housings, oil-gas separators: only hydrolysis-stabilized grades belong on the shortlist — on the BASF side that means the HR family, and on the Chinese side it means the grades explicitly marketed as hydrolysis/coolant-resistant, not a generic "PA66+30%GF."

Why the strictness: in water/glycol at service temperature, PA66 suffers both plasticization and chemical hydrolysis of the amide bonds; non-stabilized compounds can show measurable property decay within hundreds of hours above 100 °C. This is exactly the failure mode behind "the Chinese substitute worked for six months, then the end tank cracked" stories. The mechanism is well documented in the open literature on PA66-GF aging in water/glycol for radiator end tanks.

The buying context makes this trap easy to fall into: China's PA66 industry is in deep overcapacity — roughly 1.5 million t/yr of nameplate capacity against ~0.8 million t/yr of demand, with utilization below 60% — and domestic PA66 pricing sits near an 11-year low. Adiponitrile localization (Huafeng 2019; Tianchen Qixiang's butadiene-route units ramping to 400 kt/yr by mid-2026, at a reported 20–30% cost advantage vs imports) has removed the historical raw-material excuse for Chinese PA66 quality. The result: aggressive pricing from dozens of compounders, most of whom will happily quote "A3WG6 equivalent" without mentioning hydrolysis stabilization. Ask the question explicitly; don't let the datasheet answer it by omission.

Property Comparison: Ultramid A3WG6 vs Chinese PA66 GF30 Grades

A3WG6 data from BASF's current official product page and the official 2018 TDS (dry-as-molded / conditioned where published). Nanjing Julong data from the producer's own datasheet PDFs. Data marked ⚠ comes from secondary Chinese property aggregators (soliao.net, zhaosuliao.com) — non-official data, for reference only; the producer's TDS/CoA prevails. "—" = not verified from a public source.

Property (test method)	Ultramid® A3WG6 (BASF)	Nanjing Julong AG6 (general)	Nanjing Julong AG6BK-S01 (hydrolysis-res.)	Kingfa PA66-G30 ⚠	Kingfa PA66-G30 AHBK003 ⚠	Dawn GRPA66-130 ⚠
Glass content	30%	30% (ISO 1172)	30% (ISO 1172)	30% (ash, ISO 3451)	30% (ash)	30±2%
Hydrolysis / coolant positioning	Heat-aging stabilized; HR family is BASF's coolant grade	Not stated	Stated ("hydrolytic resistance"; radiator/fan applications)	SR variant stated as hydrolysis + anti-freeze resistant	"Hydrolysis stability" stated on aggregator page	Not stated (power-tool/E&E positioning)
Density, g/cm³ (ISO 1183)	1.36	1.36	1.36	1.36	1.36	—
Tensile stress at break, MPa (ISO 527)	190 / 130 (cond.)	180	175	185	190	≥150 (GB/T 1040)
Flexural modulus, MPa (ISO 178)	8600 / 6500 (cond.)	8500	8300	8200	9000	≥6000 (GB/T 9341)
Notched impact, 23 °C	12–13 kJ/m² Charpy (ISO 179/1eA) †; 11.5 kJ/m² Izod (ISO 180/A)	12 kJ/m² Izod (ISO 180)	9 kJ/m² Izod (ISO 180)	14 kJ/m² Izod (ISO 180)	12 kJ/m² Charpy (method no. not stated)	≥12 kJ/m² unnotched (standard cited inconsistently)
HDT @ 1.8 MPa, °C (ISO 75)	250	245	245	250	250	≥245 (GB/T 1634)
Melting point, °C (ISO 11357)	260	260	260	—	—	—
MVR 275 °C / 5 kg, cm³/10min (ISO 1133)	30 (current BASF page; 40 in older TDS editions)	—	—	—	—	—

† A note on the A3WG6 Charpy value (12–13 kJ/m²): BASF's current official product page lists 12 kJ/m²; the official 2018 TDS edition lists 13 kJ/m². Both are official BASF documents — the difference reflects a datasheet revision, not an error, so we show the range.

How to read this table: on dry-state, as-molded properties, the Chinese grades sit in the same band as A3WG6 — density 1.36, tensile 175–190 MPa, flex modulus 8.2–9.0 GPa, HDT ~245–250 °C. That is expected: GF30 PA66 is a mature formulation and the dry numbers are the easy part. Two rows deserve more attention than the numbers:

The hydrolysis row is the selection criterion. Among grades with usable public data, only Nanjing Julong AG6BK-S01 carries a producer-stated hydrolysis claim and a published datasheet. Kingfa's official site describes the PA66-G30 SR family as "hydrolysis resistance… resistant to anti-freeze fluid," but the SR-specific datasheet is not public; the ⚠ numbers shown are for the base G30 and the AHBK003 variant.
Dawn GRPA66-130 is in the table as a counterexample, not a candidate. Its published data (≥150 MPa tensile, ≥6 GPa flex modulus — both "minimum" values under GB methods, with an inconsistently cited impact standard) and its power-tool/E&E positioning are what a generic Chinese "PA66 GF30" offer typically looks like. It may be a fine material; it is not an end-tank material, and nothing in its public documentation claims otherwise.

Two further grades belong on the coolant-duty shortlist on producer documentation, though neither publishes a full datasheet:

PRET Technyer D222-G30HR (Shanghai PRET, 002324) — the producer's product page states "coolant-resistant, high heat resistance" with typical applications "automotive radiator end tanks, oil-gas separators, down pipes" — the most explicit A3WG6-application match we found from a Chinese producer. PRET is a large compounder (600 kt+ capacity, plants in nine countries including the US, Thailand, and Mexico, ISO 17025 lab) and states it supplies most major NEV OEMs; note that this is a company-level claim, not a per-grade OEM approval. Property values: not published ("contact the marketing center") — request the TDS directly.
CGN Juner B1G6-TS (Wenzhou) — catalog lists it as "PA66, 30% glass fiber, heat-stabilized, hydrolysis-resistant — automotive radiator end tanks," filed under dedicated end-tank materials in its engine-periphery catalog. Property values: not published (datasheet link on the site is dead).

Imported Benchmarks and the Honest Boundary

If your drawing or spec calls A3WG6 for a coolant part, the correct comparison set on the imported side is BASF's hydrolysis family, because that is what OEM material standards actually reference:

Ultramid A3WG6 HRX — BASF's current hydrolysis + heat-aging stabilized PA66-GF30 "for applications in the automotive cooling circuit" (official product page).
Ultramid A3HG6 HR — hydrolysis-resistant PA66-GF30 documented with OEM approvals including Ford WSK-M4D752-A / WSS-M4D752-B1 and GM GMW16270P-PA66-GF30 (per Material Data Center / MatWeb listings).
VW TL 52682 — Volkswagen's material spec for PA66-GF30 coolant-circuit parts exists as a formal standard (density 1.36±0.02, melting point >255 °C, plus post-coolant-aging retention requirements). This is the kind of document a serious substitution program gets measured against.

The Honest Boundary, Stated Plainly

No Chinese producer we surveyed publishes long-term LLC (long-life coolant) immersion data — thousands of hours in water/glycol at 120–135 °C with retained tensile/impact — and none publicly lists OEM material-spec approvals (Ford WSS, GM GMW, VW TL) for these specific grades. Chinese producers may hold internal data or customer-specific approvals (PRET and Kingfa supply global OEMs at the company level), but it is not public, and "not public" is the operative fact for a buyer. This evidence gap — not headline properties, not price — is where a Chinese A3WG6 substitution lives or dies, and it is exactly what a structured validation program has to close. What China offers today is price (see FAQ) and increasingly competent compounding; what it does not yet offer is a datasheet you can defend to an OEM materials engineer without generating your own aging data.

When NOT to Substitute

Be conservative in these cases — the gaps here are about evidence and specification, not about dry-state numbers:

1. Parts under an OEM material specification.

If the drawing references Ford WSS-M4D752, GM GMW16270P, VW TL 52682, or an internal OEM equivalent, a Chinese grade without that approval is not a substitution — it is a deviation. Only proceed through the OEM's material-change process, with your own validation data.

2. Safety-relevant coolant components with long warranty exposure.

Radiator end tanks and thermostat housings on platforms with 10+ year warranty expectations: the cost asymmetry is brutal. Saving 30–40% on resin is meaningless against a field-failure recall. If you cannot fund a proper LLC aging program (thousands of hours), stay with the approved imported grade.

3. When the supplier cannot distinguish "heat-stabilized" from "hydrolysis-stabilized."

If the answer to "is this grade hydrolysis-resistant?" is "it's automotive grade" or a generic PA66 GF30 datasheet, walk away. That confusion is the single most common failure root cause in this substitution, and suppliers who don't understand the question will not control the stabilization package.

4. High-temperature structural parts sized at the datasheet limit.

A3WG6's conditioned-state values (tensile 130 MPa, flex modulus 6.5 GPa after moisture conditioning) are what real parts live with. Chinese datasheets publish dry-state typicals only — if your design margin lives in the conditioned values or in creep/fatigue data, you must generate equivalent data for the substitute.

5. Programs requiring UL yellow cards or compliance files on the specific grade.

Grade-level UL cards, RoHS/REACH declarations, and food/water-contact files exist for some Chinese grades and not others. Ask for the actual document numbers (verifiable in UL Product iQ), not verbal assurance.

Substitution Verification Workflow

A pragmatic sequence before committing to a Chinese PA66 GF30 grade — ordered so the cheapest filters run first:

1
Screen on the hydrolysis question, in writing
Ask each candidate supplier: is this grade hydrolysis-stabilized for coolant contact? What stabilization system? Any internal glycol-immersion data (even 500–1000 h)? Any OEM approvals or customer end-tank references? The quality and specificity of the answer is itself a filter — serious compounders (PRET, Julong, Kingfa, Juner) answer this fluently.
2
Request documents
Producer TDS (not an aggregator screenshot), recent lot CoA, UL yellow card number, RoHS/REACH, and any aging data. Chinese compounders issue TDS/CoA routinely; refusal or vagueness is a signal.
3
Desk-check against the table above
Density should be 1.36±0.01; melting point ~260 °C; tensile 175–195 MPa dry. Watch test methods — GB/T vs ISO vs ASTM numbers are not interchangeable, and aggregator tables mix them.
4
Baseline lab work on molded plaques
Dry and conditioned (23 °C/50% RH to equilibrium) tensile/flex/impact, plus a quick screen such as 500 h in 50/50 water-glycol at 120 °C with retained tensile — a crude but brutally effective discriminator between stabilized and non-stabilized compounds.
5
Full coolant aging for coolant parts
For end-tank duty, run water-glycol immersion at service-representative temperature (typically 120–135 °C) to at least 1000 h, benchmarked in parallel against molded specimens of the incumbent BASF grade. The Chinese grade doesn't need to match BASF's curve exactly — it needs to meet your part's retention spec.
6
Mold trial with the real part
GF30 PA66 processes similarly across suppliers, but check shrinkage (typically 0.2–0.3% flow / 0.6–0.9% transverse), weld-line strength at bosses and ribs, and burst/pressure-cycle performance on the assembled tank.
7
Dual-source
Qualify at least two producers in parallel (e.g., one large compounder + one specialist). Batch consistency varies more than datasheets suggest, and China's buyer's market gives you the leverage to demand it.

FAQ

Pricing note: all price figures on this page (FAQ Q4) are B2B platform list prices and market benchmarks, not transaction prices. Actual contract pricing depends on volume, specifications, and negotiation — request formal quotes before using any figure in a cost model.

Is Ultramid A3WG6 itself a hydrolysis-resistant grade?

Not per BASF's current documentation. A3WG6 is a heat-aging-stabilized PA66-GF30; the US TDS lists cooling-system water containers among its applications, but BASF's explicitly hydrolysis-stabilized grades are A3WG6 HRX and A3HG6 HR. If your part sees sustained hot coolant, compare Chinese candidates against the HR family's requirements, not just A3WG6's dry datasheet.

Which Chinese grade is the closest match for A3WG6 in radiator end tanks?

On documentation, four grades are explicitly positioned for it: PRET Technyer D222-G30HR (producer states coolant resistance + end-tank/oil-gas-separator applications), CGN Juner B1G6-TS (catalogued as hydrolysis-resistant end-tank material), Kingfa PA66-G30 SR (producer states hydrolysis and anti-freeze resistance), and Nanjing Julong AG6BK-S01 (hydrolysis claim plus a full published datasheet — the only one of the four with public numbers). None publishes long-term coolant-aging data or OEM spec approvals publicly, so "closest" today means "most credible documentation," not "proven equivalent."

The Chinese datasheets show the same tensile strength as A3WG6. Doesn't that settle it?

No. Dry-state, as-molded tensile is the easiest property to match in a GF30 PA66 — it mostly tracks glass content and coupling chemistry. The properties that decide end-tank life (hydrolysis resistance, creep under clamp load, conditioned-state stiffness, weld-line strength) are exactly the ones missing from public Chinese datasheets. Same headline numbers are a necessary condition for the shortlist, not a sufficient condition for qualification.

How much cheaper are the Chinese grades?

As of early September 2026: domestic PA66 resin trades around ¥18,000/t (Sunsirs benchmark, near an 11-year low amid ~60% capacity utilization), domestic PA66 GF30 compounds list at roughly ¥14,000–19,000/t on B2B platforms depending on brand and volume, and imported A3WG6 is quoted by traders at roughly ¥26,000–29,500/t. These are B2B list prices and benchmarks, not transaction prices — but a 30–45% material-cost gap is realistic. Note the trap: at that spread, some offers priced "too well" are off-spec or regrind-adjacent material; very low quotes are a red flag, not a bargain.

Can I use a standard Chinese PA66 GF30 if my part is air-side, not coolant-side?

Yes — that's the low-risk case. For air-side engine-periphery parts, housings, and fans, a heat-stabilized Chinese GF30 (e.g., Julong AG6, Kingfa's HS series) is a reasonable substitute after the standard workflow: document check, conditioned-state mechanicals, mold trial. The hydrolysis screening only becomes mandatory when the part touches water/glycol.

What about Dawn GRPA66-130?

It's a legitimately published grade, but positioned for power tools and E&E, with minimum-value (not typical) properties under GB methods and no hydrolysis claim. Treat it as an example of why grade selection matters more than resin-family matching: "PA66 GF30" describes thousands of compounds; only a handful are end-tank materials.

Data Sources

Accessed 2026-09-02.

Ultramid® A3WG6 current official product page — BASF: my.basf.com/en-US/pdp/30045125
Ultramid® A3WG6 official TDS PDF (BASF SE, 04/2018; hosted by authorized distributor Picoplast): picoplast.nl (TDS PDF)
Ultramid® A3WG6 US-edition official TDS PDF (BASF Corporation, Aug 2017; third-party host; lists "water containers for automotive cooling systems" as typical application)
Ultramid® A3WG6 HRX official product page (hydrolysis-resistant variant) — BASF: my.basf.com/en-US/pdp/30364846
Ultramid A3HG6 HR with Ford/GM OEM approvals — Material Data Center / MatWeb listings (secondary compilations of BASF data): materialdatacenter.com and matweb.com
Nanjing Julong AG6 and AG6BK-S01 official datasheet PDFs — producer's product page: njjulong.cn
Kingfa automotive PA66-G30 SR hydrolysis/anti-freeze description (official): kingfa.com
Kingfa PA66-G30 and PA66-G30 AHBK003 property data (secondary aggregator — non-official data, for reference only; producer TDS/CoA prevails): soliao.net
PRET Technyer D222-G30HR product page (coolant resistance, end-tank applications; no property values published): pret.com.cn
CGN Juner B1G6-TS catalog entries (hydrolysis-resistant end-tank material; no property values published): cgnjuner.com
Dawn GRPA66-130 property table (secondary aggregator — non-official data, for reference only; producer TDS/CoA prevails): zhaosuliao.com
China PA66 overcapacity (~1.5 Mt/yr capacity vs ~0.8 Mt/yr demand, <60% utilization): Sina Finance via Eastmoney Caifuhao (2026-03-07); NCMC industry commentary (2026-06-22); China Chemical investor Q&A via 10jqka (2026-04-07); Sina Finance on Shenma (2026-07-17)
PA66 resin benchmark price — Sunsirs (100ppi.com) PA66 channel: pa66.100ppi.com
GF30 compound and imported A3WG6 trader quotes — Baidu Aigoucai / 1688 B2B listings (indicative list prices, not transaction prices; retrieved 2026-09-02)
Adiponitrile localization (Huafeng 2019; Tianchen Qixiang 2022–2026 ramp, 20–30% cost advantage): The Paper (2022-08-19); Sina Finance (2026-07-17)
PA66-GF aging in water/glycol for radiator end tanks (mechanism): "Aging in water/glycol medium of PA66 reinforced in short glass fibers for water end tank of radiator application" (open literature)
VW TL 52682 (PA66-GF30 coolant-parts material spec): archived copy on Scribd

Need This Substitution Validated?

We run the verification workflow above with Chinese producers on your behalf — hydrolysis screening in writing, TDS/CoA collection, coolant-aging coordination, and mold-trial support — so a cheaper grade never becomes a field failure.

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