PA6 GF30 and PA66 GF30 both reach 30% glass fibre; the Jinsu B7G6 and A2G30 sheets report 150 and 160 MPa tensile, but the methods differ, so neither number ranks the part.
The two datasheets use different test methods, so the tensile figures are not a ranking
Jinsu's B7G6 sheet reports 150 MPa at ASTM D638, 50 mm/min. The A2G30 sheet reports 160 MPa at ISO 527, 5 mm/min. A ten-times difference in test speed on a glass-filled polyamide changes the measured strength, and neither sheet states whether the specimen was dry or conditioned. The 10 MPa gap therefore cannot be read as A2G30 being stronger.
Both materials are polyamides reinforced with approximately 30% glass fibre by weight. The name states the fibre level, not the heat stabiliser, impact modifier, fibre length or colour, which all vary between commercial grades.
Density differs by 0.17 g/cm³, which changes part weight and piece cost
The B7G6 sheet reports 1.19 g/cm³ (ASTM D792) and the A2G30 sheet 1.36 g/cm³ (ISO 1183). On the same moulded volume, that is roughly 14% more material mass for the PA66 grade. When a part is quoted by weight, compare the delivered price per kilogram of finished part rather than the resin price per tonne.
Impact is reported on two different methods and cannot be converted
B7G6 reports 15 kJ/m² on ASTM D256 Izod; A2G30 reports 11 kJ/m² on ISO 179 Charpy. Notched and unnotched, Izod and Charpy, and different specimen cross-sections produce numbers that do not scale into each other. Request both grades on the same method before shortlisting.
Heat deflection differs by 30°C on paper, but the loads differ too
B7G6 reports 210°C at ASTM D648, 1.8 MPa. A2G30 reports 240°C at ISO 75, 1.82 MPa, unannealed specimen. The load values are close, the standards and specimen treatment are not. HDT is a short-term deflection measurement and is not a continuous service temperature: matched-method data from the same supplier show grades with 210°C and 250°C HDT both rated 135°C for the IEC 60216 temperature index at 50% tensile-strength loss after 20,000 hours.
Water absorption moves both dimensions and stiffness, and neither sheet quantifies it
Glass fibre limits some movement, but the polyamide matrix still absorbs water, and the effect is directional: a flow-aligned rib behaves differently from a feature across the flow. Neither the B7G6 nor the A2G30 sheet supplies an equilibrium moisture value or a paired dry/conditioned modulus, so a part qualified dry may miss its deflection limit after conditioning. Published same-supplier reference pairs for PA6 GF30 and PA66 GF30 list equilibrium uptake of 1.9–2.3% and 1.5–1.9% at 23°C/50% RH, with tensile modulus falling from 9.5 to 6.2 GPa and 10.0 to 7.2 GPa dry to conditioned. Those are other manufacturers' grades and illustrate the mechanism only; they are not B7G6 or A2G30 values.
Side-by-side: Jinsu grades against typical market alternatives
The table below sets the two Jinsu sheets against what is commonly offered for the same application, as ranges. Verify every figure against the supplier's current TDS before approval.
| Item | Jinsu B7G6 (PA6 GF30) | Jinsu A2G30 (PA66 GF30) | Typical market alternative |
|---|---|---|---|
| Glass fibre content | 30 ± 2%, ISO 3451 | Stated 30% GF, not measured on the sheet | Stated GF30, content rarely measured by the supplier |
| Density | 1.19 g/cm³, ASTM D792 | 1.36 g/cm³, ISO 1183 | 1.12–1.20 (PA6) and 1.35–1.40 (PA66) g/cm³ |
| Tensile strength | 150 MPa, ASTM D638, 50 mm/min | 160 MPa, ISO 527, 5 mm/min | 120–180 MPa, method usually not matched between grades |
| Notched impact | 15 kJ/m², ASTM D256 Izod | 11 kJ/m², ISO 179 Charpy | 8–18 kJ/m², Izod and Charpy mixed in catalogue data |
| HDT | 210°C, ASTM D648, 1.8 MPa | 240°C, ISO 75, 1.82 MPa | 195–250°C, load and anneal state often unstated |
| Mould shrinkage | 0.4–0.6%, ISO 294 | 0.4–0.9%, ISO 2577 | 0.3–1.0%, test box size rarely given |
| Drying before moulding | 100–120°C, 4–5 h | 100–120°C, 4–6 h | 80–120°C, 2–6 h, dryer type not specified |
| Mould temperature | 79–90°C | 80–100°C | 70–110°C |
| Dry/conditioned table supplied | No (request) | No (request) | Usually no |
| Creep or fatigue data supplied | On request | On request | Rarely |
The mould decides local strength as much as the resin does
Short fibres align during filling, so gate position, wall transitions and ribs set local stiffness, shrinkage and warpage. A weld line that falls across a loaded boss or snap can be far weaker than a standard tensile bar, and neither datasheet carries weld-line data. Both sheets give drying ranges of 100–120°C (4–5 hours for B7G6, 4–6 hours for A2G30); the melt and nozzle settings are grade-specific and should be recorded separately from the mould temperature during the trial.
A qualification sequence that produces a defensible choice
Record the service envelope first: peak and normal temperature, dry and wet exposure, load and duration, vibration, chemicals and required life. Then request matched-method dry and conditioned data plus creep and aging curves for the exact grades, mould both candidates in the production tool, and test parts as moulded and conditioned. Compare total part cost — resin, drying energy, cycle time, scrap, tooling change and inspection — rather than price per tonne. If neither grade holds dimensions and strength across the envelope, change the formulation or polymer family instead of forcing a PA6-versus-PA66 decision.
Frequently asked questions
Is PA66 GF30 always stronger than PA6 GF30 for structural parts?
No. The Jinsu sheets report 150 and 160 MPa on ASTM D638 at 50 mm/min and ISO 527 at 5 mm/min — different methods. Compare matched-condition data on your actual geometry.
Does 30% glass fibre stop nylon from absorbing water?
No. The polyamide matrix still absorbs water, and neither the B7G6 nor the A2G30 sheet quantifies equilibrium uptake. Measure the moulded part after conditioning.
Can I use a 240°C HDT as a continuous working temperature?
No. HDT is a short-term deflection under a defined load. Use the grade's long-term heat-aging, creep and retained-strength data for sustained loads.
Can I switch from PA6 GF30 to PA66 GF30 without changing the mould?
Do not assume so. Shrinkage ranges 0.4–0.6% and 0.4–0.9% come from different test methods, so check fill, weld-line position, flatness and fits in a production trial.
Compliance note: the values above are typical figures from Jinsu material sheets and public standards, for selection guidance only and not acceptance criteria. Flame, heat and mechanical performance depend on grade, wall thickness, moisture state and process conditions and must be verified before mass production. Grade names and standards mentioned belong to their respective owners. Contact Jinsu for the current TDS and test reports.
Sources: PA6 GF30 B3EG6 · PA66 GF30 A3EG6 · BASF's material-modeling guidance · Envalior's weld-line guidance.
Further reading and contact: why nylon dimensions change after water absorption · general PA6 vs PA66 buying guide · Jinsu's technical team.