Problem & Solution

Practical answers to common plastic material challenges

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Q

PPO Stress Cracking and Environmental Media

A

For PPO stress cracking look at the media list; annealing plus alloying is the way out; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problem...

Production & Quality stress crackingESCmediaannealing

Q

PPO Automotive Underhood Parts

A

PPO alloy for underhood applications, GTX for oil resistance and PPX for stable dimensions; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar pro...

Production & Quality underhoodoil resistancehigh temperaturealloy

Q

PPO Foaming Grade Processing

A

PPO foaming material has a narrow temperature window; verify both density and flame retardancy indicators; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for s...

Production & Quality foaming gradecelldensityflame retardant

Q

PPO Extruded Product Post-Treatment

A

PPO extruded large part post-treatment is baking for 24 hours at use temperature minus 10℃; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent simil...

Production & Quality post-treatmentinternal stressextruded productannealing

Q

High internal stress and easy cracking of PPO

A

The high internal stress of PPO is the inherent result of rigid molecular chains; annealing post-treatment is industry practice; stress cracking verification must simulate the actual media environment.; after confirming effectiveness, solidify the parameters and practices into the work instructio...

Production & Quality PPO; internal stress; cracking; annealing; mold temperature; solvent

Q

Wrong use of PP homopolymer/copolymer grades

A

For PP material selection, first distinguish 'homopolymer or copolymer': choose homopolymer for rigidity, copolymer for impact resistance and low temperature resistance; many 'quality problems' are actually material selection errors, which cannot be compensated no matter how good the process is.

Production & Quality PP; homopolymer; copolymer; material selection; grade

Q

Environmental stress cracking (ESCR) of PP products

A

Before PP contains chemicals, ESCR verification must be done first: problems occur only when the material grade, internal stress, and medium are superimposed; don't blame only the material for cracked parts—internal stress management and structural fillets are equally important.

Production & Quality PP; ESCR; stress cracking; medium; grade; internal stress

Q

PP Part Stress Crack Resistance

A

Verify ESCR before holding chemicals.

Production & Quality PP;ESCR;stress cracking;media;grade

Q

POM Regrind Usage Ratio

A

POM regrind has a clear ratio discipline; the 20-30% upper limit plus use-based grading balances cost and quality; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Production & Quality POM;regrind;20-30%;heat history;ratio

Q

POM snap-fit fatigue application

A

POM's fatigue performance is the capital for its dominance in moving parts; design verification must include the stress concentration factor in the fatigue account; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Production & Quality POM；snap-fit；fatigue；35MPa；door lock

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