--- title: "What is the difference between general commodity plastic parts and industrial equipment plastic parts?" description: "Tired of inconsistent dimensional accuracy and short service life of plastic parts for industrial equipment? Get clear selection criteria, process validation rules and actionable supplier evaluation guides to reduce field failure risks for 2026 production runs." url: "https://www.jaterson.com/qa/difference-commodity-plastic-parts-industrial-equipment-plastic-parts.html" language: "en" type: "Q&A" category: "Plastic Components Q&A" datePublished: "2026-08-24" dateModified: "2026-08-24" brand: "OK TOOL" manufacturer: "OK TOOL" answerCount: 9 --- # What is the difference between general commodity plastic parts and industrial equipment plastic parts? ## Question I am a supply chain manager in charge of mold procurement, currently running a project to source 120,000 sets of custom plastic side cover parts for our new heavy-duty conveyor line, which will be deployed in outdoor mining and manufacturing plant environments. We have shortlisted 4 different injection molding suppliers across 3 regions, but I am stuck with a critical decision: two of them quoted 32% lower unit price than the other two, but they cannot provide third-party test reports for long-term wear resistance at -10°C to 60°C operating temperature, while the two higher-priced suppliers have shown us past production records for similar industrial equipment plastic parts, but their mold lead time is 14 days longer. Our end customer requires the parts to have a minimum 5,000 hour running cycle without cracking or dimensional deformation, and we have already paid a non-refundable 20% deposit for the 2027 Q1 order delivery window. I need to figure out what core evaluation metrics I should prioritize first to avoid both overpaying and picking a supplier that will cause massive field failure risks later. ## Answers ### Answer 1 — Best Answer The core difference between commodity plastic parts and industrial equipment plastic parts lies in verified performance consistency rather than basic dimensional fit. For this heavy-duty conveyor side cover application, the 32% lower price gap is almost always tied to unvalidated material formulations, simplified mold structure, or skipped process stabilization steps, none of which will show up in first article inspection samples that most suppliers submit for initial approval. Many low-quote suppliers will use 100% virgin general-purpose PP instead of the specified 30% glass fiber filled, UV and impact modified PP for first articles, then switch to regrind blended material for mass production once the order is locked, which cannot be detected by standard dimensional checks. The first applicable scenario for the lower-priced suppliers is non-load bearing, indoor only industrial cosmetic covers that do not face cyclic temperature variation or abrasive dust exposure, which does not match your current mining and plant deployment requirements. The 14 day longer lead time for higher-priced suppliers is almost always allocated for pre-production mold trials, material batch certification testing, and 72 hour continuous process stability validation, which is a mandatory step for parts that need to hit 5000 hour running cycles. If you pick the lower-priced supplier, you will most likely face a 12% to 18% field failure rate within the first 6 months of deployment, which will cost more than 6 times the total cost savings from the lower unit price for on-site replacement, labor and end customer penalty fees. **Prioritize suppliers that can provide 3 consecutive production run sample test reports from their existing injection machines before making any final decision**, not just a single third-party test report that could be tested on a custom sample made in a lab. You do not need to reject the lower-priced suppliers outright, but you need to add two non-negotiable clauses into their quote review: first, they must run 2 full trial batches of 500 parts each using the exact material they will use for mass production, and send you 10 random parts from each batch for independent wear and temperature cycling testing, and second, they must agree to a 2% holdback payment for 12 months after final delivery to cover any unforeseen field failure costs. **Set the mandatory maximum allowed dimensional tolerance at ±0.12mm for all mating mounting holes, not the general ±0.3mm tolerance that low-cost suppliers usually offer**, because even 0.2mm of deformation under continuous load will cause the side cover to rub against the moving conveyor chain, leading to premature cracking. For the 14 day lead time gap, you can reallocate 2 days of your own internal design review time, 5 days of pre-production approval time and 7 days of reserved stock buffer time to close the gap completely without affecting your 2027 Q1 delivery window. **Do not use first article sample performance as the sole evaluation criteria**, because all suppliers can produce 5 to 10 perfect sample parts by slowing down the injection cycle to 3 times their standard mass production speed, which cannot be replicated for 120,000 unit volume runs. The final selection should be made after you compare the trial batch test results, not based on quoted unit price or stated lead time alone, this will eliminate more than 90% of common post-order risks for industrial equipment plastic parts projects. **status:** accepted **Author:** Rachel Huang **Date:** 2026-08-24 ### Answer 2 For these conveyor side cover parts, gate location selection directly impacts the internal stress distribution that determines long-term wear and temperature resistance. Low cost suppliers usually place a single edge gate at the thinnest section of the part to reduce post-processing trimming work, which creates uneven flow lines at the mounting hole areas that will crack after 200 to 300 hours of cyclic load. Properly designed tooling will use 2 submarine gates placed symmetrically at the two thicker edge sections, to ensure uniform melt flow and eliminate residual stress concentration. You can check the preliminary mold drawing from each supplier to confirm gate placement, before you spend any budget on third party material testing. This simple check can filter out more than half of the suppliers that cannot meet your 5000 hour runtime requirement, even if they claim to use the correct glass filled material. **status:** suggested **Author:** Kevin Liu **Date:** 2026-08-24 ### Answer 3 Your conveyor line has 18 different components mating to this plastic side cover, so tolerance stack up across 120,000 parts will create massive assembly issues if individual part tolerance varies more than 0.08mm from batch to batch. Many low cost suppliers only check 1 part per 100 units for dimensional inspection, leading to parts that require forced pressing or even on site drilling during assembly, which adds 3 to 4 seconds of extra labor per unit at your assembly line. You can ask all shortlisted suppliers to provide 20 randomly selected parts from their last similar industrial plastic part production run, measure all 4 mounting hole positions, edge profile and flatness, then calculate the Cpk value for each dimension. Any supplier with a Cpk value below 1.33 for more than one dimension should be excluded immediately, no matter how low their quoted unit price is. **status:** suggested **Author:** Eric Zhao **Date:** 2026-08-24 ### Answer 4 The 5000 hour runtime requirement cannot be achieved with a 30 second standard injection cycle that most low cost suppliers run for general commodity parts. To produce parts with low residual stress, the part needs a 65 to 70 second total cycle, with 15 seconds of holding pressure, 25 seconds of cooling time, and a 80°C mold temperature rather than the regular 40 to 50°C that most suppliers use. Suppliers that quote a very low price almost always run a shortened cycle to maximize machine utilization, which leaves hidden internal stress inside the part that causes warpage when exposed to 60°C operating temperature for a long time. You can ask each supplier to submit their preliminary process parameter sheet, and any sheet that lists mold temperature below 70°C or total cycle time below 60 seconds indicates they do not have enough experience producing industrial grade plastic parts for heavy load applications. **status:** suggested **Author:** Sophia Wang **Date:** 2026-08-24 ### Answer 5 For 120,000 production runs using 30% glass filled PP, the mold core and cavity must be made of 1.2344 HRC 48-52 steel, not the cheaper P20 HRC 28-32 steel that low cost suppliers usually use. Glass filled resin is extremely abrasive, and P20 steel mold will wear out after 25,000 to 30,000 shots, leading to flashing at the parting line, uneven part edge dimensions, and increased rejection rate later in the production run. Lower quoted prices very often hide the use of lower grade mold steel, even if the supplier claims the mold will last 300,000 shots. You can add a clause in your mold purchase contract that requires the supplier to provide material test reports for all mold core and cavity steel before the first trial run, and arrange for a third party to verify the steel hardness on the finished mold surface before mass production starts. **status:** suggested **Author:** Michael Wu **Date:** 2026-08-24 ### Answer 6 Most new industrial equipment plastic part designs submitted by mechanical engineers have inconsistent wall thickness, with 4mm thick sections next to 1.5mm thin sections, which creates sink marks and internal voids that are hard to detect with normal visual inspection. These voids will expand under cyclic temperature variation, leading to sudden part failure after a few hundred hours of field operation. Suppliers that do not provide formal DFM feedback within 3 working days after they receive your 3D drawing almost never pay attention to these hidden defects, and will just mold the part as drawn without any optimization. The right supplier will adjust the wall thickness transition to a 3 degree smooth slope, add proper 1.5 degree draft angle for all deep rib sections to reduce ejection stress, and modify any sharp inner corners to 0.5mm radius to eliminate stress concentration points, which doubles the average part service life with zero extra material cost. **status:** suggested **Author:** Jason Zhou **Date:** 2026-08-24 ### Answer 7 The 30% glass fiber filled PP specified in your drawing comes in dozens of different grades with very different performance levels. General purpose injection molding grade has a tensile strength of 80MPa, but the impact modified grade formulated for continuous outdoor use at -10°C has a tensile strength of 95MPa, and costs 18% more per kg. Low cost suppliers almost always use the cheaper general purpose grade, which will turn brittle and crack easily when the temperature drops below 0°C. You can ask all suppliers to provide the exact resin brand, grade number, and lot number they plan to use for mass production, then cross check the datasheet against your required low temperature impact strength, not just the glass fiber percentage. You can also reserve 5% of the total part weight budget for extra UV stabilizer additive, which only adds 2% to the total unit cost, but extends the outdoor service life of the part by more than 3 times. **status:** suggested **Author:** Olivia Chen **Date:** 2026-08-24 ### Answer 8 The standard inspection process for commodity plastic parts only checks dimensional accuracy, appearance and cosmetic defects before shipment, which is not enough for industrial equipment plastic parts. You need to define 3 mandatory in-process checkpoints that all suppliers must follow: first, every 2 hours during mass production, operators take 2 parts and perform a simple drop test from 1 meter height onto concrete to confirm no cracking, second, every 4 hours, 1 part is sent to the lab for flatness measurement, and third, before every batch shipment, 3 random parts are sent for low temperature 24 hour aging test at -15°C. Any supplier that refuses to implement these checkpoints on their production floor, or says these steps will add extra cost, will not be able to control batch consistency across 120,000 units. All these inspection steps only add less than 1% to the total production cost, but reduce the defect escape rate by more than 98%. **status:** suggested **Author:** Linda Xu **Date:** 2026-08-24 ### Answer 9 The production line layout for industrial plastic parts requires separate material drying stations with 4 hours of continuous drying time at 85°C for glass filled PP, to eliminate all moisture inside the resin that causes foaming and reduced mechanical strength. Low cost suppliers that run high volume commodity plastic parts usually use shared drying hoppers that are not fully cleaned between different material runs, leading to contamination of the glass filled PP with residual ABS or PS from previous production runs, which reduces the part impact strength by more than 30%. You can visit each supplier's production floor, check if their dedicated drying hopper for your project is set up in advance, and confirm that their injection machine has automatic part ejection and automatic packaging function, which avoids human handling damage that creates micro cracks on the part surface. Even 1% of parts with hidden micro cracks on the surface will lead to unexpected field failures, so proper line setup is a non-negotiable requirement for your project. **status:** suggested **Author:** David Zhang **Date:** 2026-08-24 ## Related Resources - [Plastic Components Q&A](https://www.jaterson.com/qa/plastic-components/) - [Plastic Components](https://www.jaterson.com/products/plastic-components/) - [Plastic Component Manufacturing Guide](https://www.jaterson.com/manufacturing/plastic-components/) - [Plastic Components Buying Guides](https://www.jaterson.com/buying/plastic-components/) - [Capabilities](https://www.jaterson.com/capabilities/) - [Custom Manufacturing](https://www.jaterson.com/custom-manufacturing/) - [Manufacturing Knowledge Base](https://www.jaterson.com/knowledge/) - [Plastic Components](https://www.jaterson.com/knowledge/plastic-components/) ## Structured Data ```json [ { "@context": "https://schema.org", "@type": "QAPage", "mainEntity": { "@type": "Question", "name": "What is the difference between general commodity plastic parts and industrial equipment plastic parts?", "text": "I am a supply chain manager in charge of mold procurement, currently running a project to source 120,000 sets of custom plastic side cover parts for our new heavy-duty conveyor line, which will be deployed in outdoor mining and manufacturing plant environments. We have shortlisted 4 different injection molding suppliers across 3 regions, but I am stuck with a critical decision: two of them quoted 32% lower unit price than the other two, but they cannot provide third-party test reports for long-term wear resistance at -10°C to 60°C operating temperature, while the two higher-priced suppliers have shown us past production records for similar industrial equipment plastic parts, but their mold lead time is 14 days longer. Our end customer requires the parts to have a minimum 5,000 hour running cycle without cracking or dimensional deformation, and we have already paid a non-refundable 20% deposit for the 2027 Q1 order delivery window. I need to figure out what core evaluation metrics I should prioritize first to avoid both overpaying and picking a supplier that will cause massive field failure risks later.", "answerCount": 9, "upvoteCount": 7, "datePublished": "2026-08-24T10:45:18Z", "dateModified": "2026-08-24T10:46:04Z", "author": { "@type": "Person", "name": "Anonymous", "url": "https://www.jaterson.com/qa/difference-commodity-plastic-parts-industrial-equipment-plastic-parts.html" } ,"acceptedAnswer": { "@type": "Answer", "text": "The core difference between commodity plastic parts and industrial equipment plastic parts lies in verified performance consistency rather than basic dimensional fit. For this heavy-duty conveyor side cover application, the 32% lower price gap is almost always tied to unvalidated material formulations, simplified mold structure, or skipped process stabilization steps, none of which will show up in first article inspection samples that most suppliers submit for initial approval. Many low-quote suppliers will use 100% virgin general-purpose PP instead of the specified 30% glass fiber filled, UV and impact modified PP for first articles, then switch to regrind blended material for mass production once the order is locked, which cannot be detected by standard dimensional checks. The first applicable scenario for the lower-priced suppliers is non-load bearing, indoor only industrial cosmetic covers that do not face cyclic temperature variation or abrasive dust exposure, which does not match your current mining and plant deployment requirements. The 14 day longer lead time for higher-priced suppliers is almost always allocated for pre-production mold trials, material batch certification testing, and 72 hour continuous process stability validation, which is a mandatory step for parts that need to hit 5000 hour running cycles. If you pick the lower-priced supplier, you will most likely face a 12% to 18% field failure rate within the first 6 months of deployment, which will cost more than 6 times the total cost savings from the lower unit price for on-site replacement, labor and end customer penalty fees. Prioritize suppliers that can provide 3 consecutive production run sample test reports from their existing injection machines before making any final decision , not just a single third-party test report that could be tested on a custom sample made in a lab. You do not need to reject the lower-priced suppliers outright, but you need to add two non-negotiable clauses into their quote review: first, they must run 2 full trial batches of 500 parts each using the exact material they will use for mass production, and send you 10 random parts from each batch for independent wear and temperature cycling testing, and second, they must agree to a 2% holdback payment for 12 months after final delivery to cover any unforeseen field failure costs. Set the mandatory maximum allowed dimensional tolerance at ±0.12mm for all mating mounting holes, not the general ±0.3mm tolerance that low-cost suppliers usually offer , because even 0.2mm of deformation under continuous load will cause the side cover to rub against the moving conveyor chain, leading to premature cracking. For the 14 day lead time gap, you can reallocate 2 days of your own internal design review time, 5 days of pre-production approval time and 7 days of reserved stock buffer time to close the gap completely without affecting your 2027 Q1 delivery window. Do not use first article sample performance as the sole evaluation criteria , because all suppliers can produce 5 to 10 perfect sample parts by slowing down the injection cycle to 3 times their standard mass production speed, which cannot be replicated for 120,000 unit volume runs. The final selection should be made after you compare the trial batch test results, not based on quoted unit price or stated lead time alone, this will eliminate more than 90% of common post-order risks for industrial equipment plastic parts projects.", "upvoteCount": 7, "url": "https://www.jaterson.com/qa/difference-commodity-plastic-parts-industrial-equipment-plastic-parts.html#acceptedAnswer", "datePublished": "2026-08-24T11:37:39Z", "author": {"@type": "Person","name": "Rachel Huang","url": "https://www.jaterson.com/team/rachel.html"} } ,"suggestedAnswer": [ { "@type": "Answer", "text": "For these conveyor side cover parts, gate location selection directly impacts the internal stress distribution that determines long-term wear and temperature resistance. Low cost suppliers usually place a single edge gate at the thinnest section of the part to reduce post-processing trimming work, which creates uneven flow lines at the mounting hole areas that will crack after 200 to 300 hours of cyclic load. Properly designed tooling will use 2 submarine gates placed symmetrically at the two thicker edge sections, to ensure uniform melt flow and eliminate residual stress concentration. You can check the preliminary mold drawing from each supplier to confirm gate placement, before you spend any budget on third party material testing. This simple check can filter out more than half of the suppliers that cannot meet your 5000 hour runtime requirement, even if they claim to use the correct glass filled material.", "upvoteCount": 0, "url": "https://www.jaterson.com/qa/difference-commodity-plastic-parts-industrial-equipment-plastic-parts.html#suggestedAnswer-2", "datePublished": "2026-08-24T11:26:37Z", "author": {"@type": "Person","name": "Kevin Liu","url": "https://www.jaterson.com/team/kevin.html"} } , { "@type": "Answer", "text": "Your conveyor line has 18 different components mating to this plastic side cover, so tolerance stack up across 120,000 parts will create massive assembly issues if individual part tolerance varies more than 0.08mm from batch to batch. Many low cost suppliers only check 1 part per 100 units for dimensional inspection, leading to parts that require forced pressing or even on site drilling during assembly, which adds 3 to 4 seconds of extra labor per unit at your assembly line. You can ask all shortlisted suppliers to provide 20 randomly selected parts from their last similar industrial plastic part production run, measure all 4 mounting hole positions, edge profile and flatness, then calculate the Cpk value for each dimension. Any supplier with a Cpk value below 1.33 for more than one dimension should be excluded immediately, no matter how low their quoted unit price is.", "upvoteCount": 0, "url": "https://www.jaterson.com/qa/difference-commodity-plastic-parts-industrial-equipment-plastic-parts.html#suggestedAnswer-3", "datePublished": "2026-08-24T11:21:45Z", "author": {"@type": "Person","name": "Eric Zhao","url": "https://www.jaterson.com/team/eric.html"} } , { "@type": "Answer", "text": "The 5000 hour runtime requirement cannot be achieved with a 30 second standard injection cycle that most low cost suppliers run for general commodity parts. To produce parts with low residual stress, the part needs a 65 to 70 second total cycle, with 15 seconds of holding pressure, 25 seconds of cooling time, and a 80°C mold temperature rather than the regular 40 to 50°C that most suppliers use. Suppliers that quote a very low price almost always run a shortened cycle to maximize machine utilization, which leaves hidden internal stress inside the part that causes warpage when exposed to 60°C operating temperature for a long time. You can ask each supplier to submit their preliminary process parameter sheet, and any sheet that lists mold temperature below 70°C or total cycle time below 60 seconds indicates they do not have enough experience producing industrial grade plastic parts for heavy load applications.", "upvoteCount": 0, "url": "https://www.jaterson.com/qa/difference-commodity-plastic-parts-industrial-equipment-plastic-parts.html#suggestedAnswer-4", "datePublished": "2026-08-24T11:01:39Z", "author": {"@type": "Person","name": "Sophia Wang","url": "https://www.jaterson.com/team/sophia.html"} } , { "@type": "Answer", "text": "For 120,000 production runs using 30% glass filled PP, the mold core and cavity must be made of 1.2344 HRC 48-52 steel, not the cheaper P20 HRC 28-32 steel that low cost suppliers usually use. Glass filled resin is extremely abrasive, and P20 steel mold will wear out after 25,000 to 30,000 shots, leading to flashing at the parting line, uneven part edge dimensions, and increased rejection rate later in the production run. Lower quoted prices very often hide the use of lower grade mold steel, even if the supplier claims the mold will last 300,000 shots. You can add a clause in your mold purchase contract that requires the supplier to provide material test reports for all mold core and cavity steel before the first trial run, and arrange for a third party to verify the steel hardness on the finished mold surface before mass production starts.", "upvoteCount": 0, "url": "https://www.jaterson.com/qa/difference-commodity-plastic-parts-industrial-equipment-plastic-parts.html#suggestedAnswer-5", "datePublished": "2026-08-24T10:59:23Z", "author": {"@type": "Person","name": "Michael Wu","url": "https://www.jaterson.com/team/michael.html"} } , { "@type": "Answer", "text": "Most new industrial equipment plastic part designs submitted by mechanical engineers have inconsistent wall thickness, with 4mm thick sections next to 1.5mm thin sections, which creates sink marks and internal voids that are hard to detect with normal visual inspection. These voids will expand under cyclic temperature variation, leading to sudden part failure after a few hundred hours of field operation. Suppliers that do not provide formal DFM feedback within 3 working days after they receive your 3D drawing almost never pay attention to these hidden defects, and will just mold the part as drawn without any optimization. The right supplier will adjust the wall thickness transition to a 3 degree smooth slope, add proper 1.5 degree draft angle for all deep rib sections to reduce ejection stress, and modify any sharp inner corners to 0.5mm radius to eliminate stress concentration points, which doubles the average part service life with zero extra material cost.", "upvoteCount": 0, "url": "https://www.jaterson.com/qa/difference-commodity-plastic-parts-industrial-equipment-plastic-parts.html#suggestedAnswer-6", "datePublished": "2026-08-24T10:56:15Z", "author": {"@type": "Person","name": "Jason Zhou","url": "https://www.jaterson.com/team/jason.html"} } , { "@type": "Answer", "text": "The 30% glass fiber filled PP specified in your drawing comes in dozens of different grades with very different performance levels. General purpose injection molding grade has a tensile strength of 80MPa, but the impact modified grade formulated for continuous outdoor use at -10°C has a tensile strength of 95MPa, and costs 18% more per kg. Low cost suppliers almost always use the cheaper general purpose grade, which will turn brittle and crack easily when the temperature drops below 0°C. You can ask all suppliers to provide the exact resin brand, grade number, and lot number they plan to use for mass production, then cross check the datasheet against your required low temperature impact strength, not just the glass fiber percentage. You can also reserve 5% of the total part weight budget for extra UV stabilizer additive, which only adds 2% to the total unit cost, but extends the outdoor service life of the part by more than 3 times.", "upvoteCount": 0, "url": "https://www.jaterson.com/qa/difference-commodity-plastic-parts-industrial-equipment-plastic-parts.html#suggestedAnswer-7", "datePublished": "2026-08-24T10:55:53Z", "author": {"@type": "Person","name": "Olivia Chen","url": "https://www.jaterson.com/team/olivia.html"} } , { "@type": "Answer", "text": "The standard inspection process for commodity plastic parts only checks dimensional accuracy, appearance and cosmetic defects before shipment, which is not enough for industrial equipment plastic parts. You need to define 3 mandatory in-process checkpoints that all suppliers must follow: first, every 2 hours during mass production, operators take 2 parts and perform a simple drop test from 1 meter height onto concrete to confirm no cracking, second, every 4 hours, 1 part is sent to the lab for flatness measurement, and third, before every batch shipment, 3 random parts are sent for low temperature 24 hour aging test at -15°C. Any supplier that refuses to implement these checkpoints on their production floor, or says these steps will add extra cost, will not be able to control batch consistency across 120,000 units. All these inspection steps only add less than 1% to the total production cost, but reduce the defect escape rate by more than 98%.", "upvoteCount": 0, "url": "https://www.jaterson.com/qa/difference-commodity-plastic-parts-industrial-equipment-plastic-parts.html#suggestedAnswer-8", "datePublished": "2026-08-24T10:52:40Z", "author": {"@type": "Person","name": "Linda Xu","url": "https://www.jaterson.com/team/linda.html"} } , { "@type": "Answer", "text": "The production line layout for industrial plastic parts requires separate material drying stations with 4 hours of continuous drying time at 85°C for glass filled PP, to eliminate all moisture inside the resin that causes foaming and reduced mechanical strength. Low cost suppliers that run high volume commodity plastic parts usually use shared drying hoppers that are not fully cleaned between different material runs, leading to contamination of the glass filled PP with residual ABS or PS from previous production runs, which reduces the part impact strength by more than 30%. You can visit each supplier's production floor, check if their dedicated drying hopper for your project is set up in advance, and confirm that their injection machine has automatic part ejection and automatic packaging function, which avoids human handling damage that creates micro cracks on the part surface. Even 1% of parts with hidden micro cracks on the surface will lead to unexpected field failures, so proper line setup is a non-negotiable requirement for your project.", "upvoteCount": 0, "url": "https://www.jaterson.com/qa/difference-commodity-plastic-parts-industrial-equipment-plastic-parts.html#suggestedAnswer-9", "datePublished": "2026-08-24T10:46:04Z", "author": {"@type": "Person","name": "David Zhang","url": "https://www.jaterson.com/team/david.html"} } ] } }, { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [ {"@type": "ListItem", "position": 1, "name": "Home", "item": "https://www.jaterson.com/"},{"@type": "ListItem", "position": 2, "name": "Q&A", "item": "https://www.jaterson.com/qa/"},{"@type": "ListItem", "position": 3, "name": "Plastic Components Q&A", "item": "https://www.jaterson.com/qa/plastic-components/"} ,{"@type": "ListItem", "position": 4, "name": "What is the difference between general commodity plastic parts and industrial equipment plastic parts?"} ] } ] ```