Prove the Performance Gap in the PA66 Baseline
Before screening PPA, document the exact PA66 grade, color, condition, mold, process, and measured failure. The gap may involve hot-load stiffness, creep, humidity movement, chemicals, hydrolysis, electrical performance, thermal processing, or durability.
Investigate the gap against the baseline, target, test method and acceptance limit. If geometry, fiber orientation, weld lines, cooling, moisture or process variation causes the failure, correct the design and molding issues before deciding whether to change the material system.
- Exact PA66 grade, conditioning state and current TDS revision
- Measured failure location, environment, time and temperature
- Required improvement and representative pass-or-fail method
- Design, mold and process causes already investigated
Compare Elevated-Temperature and Conditioned Performance
Partially aromatic PPA is often screened when PA66 cannot maintain mechanics or dimensions at higher temperature or humidity. Do not compare only dry tensile values at room temperature. Review stiffness, strength, creep, fatigue, thermal aging, and dimensions at the expected load, temperature, and moisture state.
HDT compares loaded heat deflection; melting point identifies the thermal transition. Use creep and heat-aging data for service duration. Compare deformation retention at equal load and time before expanding PPA trials.
Define Moisture, Chemical and Electrical Requirements Precisely
For moisture-related dimensional limits, start with catalog water absorption for EAG230 and EAG630H, then measure critical thicknesses and tolerance locations. Record conditioning, temperature and exposure time with each result.
Chemical and electrical suitability are grade- and test-specific. List every coolant, oil, fuel, salt solution, cleaning agent or other medium with concentration, temperature and exposure mode. For electrical parts, define voltage, resistance or dielectric requirement, humidity, wall thickness, flame rating, tracking or other applicable test and required approval. Do not infer compliance from the PPA family name.
Review the PPA Molding System Before Material Approval
PPA and PA66 need separate, grade-specific processing reviews. Confirm packaging, storage, drying, moisture measurement, machine capability, screw and barrel suitability, residence control, and hot-runner guidance. Also check mold temperature, runner and gate sizing, venting, cooling, ejection, startup, purging, and shutdown.
Many PPA grades process at higher temperatures. This can expose limits in heaters, controls, hot runners, seals, tooling, cooling, or changeover practice. Fiber orientation and weld lines remain important. Review mold and machine feasibility before ordering a production trial or using an existing PA66 tool.
- Drying requirements and pellet moisture confirmed for the specific grade and packaging history
- Machine, hot runner, nozzle, tooling and temperature-control capability
- Gate, venting, weld-line, orientation, surface and ejection requirements
- Purging, contamination control, residence management and safe shutdown
Representative electrical-part geometries only. Wall thickness, inserts, weld lines, drying, mold temperature, and machine capability still require grade-specific review; the images do not imply a PPA approval.
- Connector housing
- Terminal housing
- Insulation support
Use Matched GF30 Catalogue Examples Correctly
Use EAG230 (PA66 GF30) as the baseline and compare EAG630H (PPA GF30) as a candidate for elevated-temperature loads or insufficient stiffness. Both compounds contain 30% glass fiber. EAG630H has higher catalogue HDT and flexural modulus; verify hot stiffness and creep performance with the corresponding tests.
The table lists typical catalogue values with the test method for each property. HDT compares thermal deformation under a specified load; consult the corresponding grade data for continuous-use temperature, thermal aging and chemical resistance.
Taiyi Polymer PA66 / PPA GF30 Typical Data Comparison
Retest the Failed PA66 Requirements and Confirm Production Conditions
Mold traceable PA66 baseline and PPA candidate parts with stable grade-appropriate process windows. Record material moisture, lot, fill and pack outputs, part weight, mold-surface temperatures, cavity balance, cycle, surface, weld lines, dimensions and warpage. Inspect parts at defined dry and conditioned intervals using the same datums and methods.
Repeat the tests under the load, temperature, humidity, chemical or electrical conditions that previously failed. Check assembly, impact, fatigue, creep, mating surfaces, post-processing and required documents. Base release on measured improvement and manufacturing feasibility. Share the current grade and failed test items to receive a targeted PPA / PA66 candidate comparison, TDS data and molding-trial sample support.