A 28mm PET preform is a specification-driven packaging input. The neck finish, material grade, food-contact evidence, cap fit, and order terms decide whether it works on a blow-molding line.

A 28mm PET preform is not a finished bottle. It is an injection-molded PET intermediate that is later reheated and blown into a bottle. The 28mm dimension usually refers to the neck finish family, but that single number does not define the full purchase. Buyers comparing 28mm PET preforms still need to confirm the exact neck specification, preform weight, color, cap compatibility, food-contact reports, MOQ, lead time, and application limits.

That is why the 28mm PET preform question is a constraint question rather than a simple product-choice question. In the supplied product scope, 28mm is one of the listed neck sizes, alongside 20 mm, 24 mm, 30 mm, and 32 mm. Neck dimensions can also be specified as custom dimensions in millimeters. The procurement task is therefore to turn a nominal 28mm requirement into a matched preform-and-cap specification with documented compliance.

Why 28mm PET preform is a constraint-driven purchase

The first constraint is dimensional, but not in the way many buyers expect. A 28mm neck size tells the supplier which neck family the buyer is targeting. It does not confirm that a given cap will seal, that the preform weight is suitable for the bottle design, or that the preform will run at the target blow-molding speed. The supplied guidance is explicit on this point: neck finish should be tolerance-controlled with dimension spot checks and cap fitment tests, and preforms and caps should be bought as a matched set.

The second constraint is material and food-contact compliance. GuangDong Idea Plastic Packaging specifies food-grade PET as the material for its PET preform range. The product properties listed in the supplied specification are high transparency, high strength, and easy blow-moldability. Those are useful starting points, but they do not replace the compliance file. For a 28mm PET bottle preform used in drinking water, juice, edible oil, condiment, or daily chemical packaging, the buyer should verify that the food-contact test report covers the actual model and the intended market.

The third constraint is commercial. MOQ, lead time, color, customization, and inspection terms can change the effective supply plan. The supplied capability data lists a MOQ of 10,000 pieces, a monthly capacity of 500,000 pcs/month, and a lead time of 15 days for 10,001–200,000 pcs; above 200,000 pcs, delivery time is negotiable. Those figures are useful for screening, but they should be confirmed against the specific 28mm specification and order quantity.

The 28mm specification: what is actually defined

The supplied product scope for the PET preform range lists neck sizes of 20 mm, 24 mm, 28 mm, 30 mm, and 32 mm. A 28 mm neck size is included in the product scope, and custom neck dimensions in millimeters are possible. The same range is described as a food-grade PET preform intended for bottle packaging scenarios.

The product type listing includes water bottle preform, oil preform, cosmetic preform, and wide mouth preform. That matters because a 28mm PET preform may be discussed in water and beverage contexts, while the same supplier range also covers oil and other packaging applications. The buyer should not assume that every model in the range shares the same neck specification. The model and the neck finish should be confirmed in the quotation.

Food-contact compliance: reports, standards, and model coverage

For a 28mm PET preform used in food-contact packaging, compliance is not a generic claim. It is a document trail. The supplied documentation identifies two food-contact plastic test reports for the PET Preform product, with the Water Bottle Preform-401 model linked to both reports.

The first report is numbered 180327075a 001. It is a food-contact plastic test report under Regulation (EC) No 1935/2004 and Commission Regulation (EU) No 10/2011. It was issued by TÜV Rheinland/CCIC (Ningbo) Co., Ltd. on 2025-04-23. The listed scope includes sensorial assessment, overall migration, specific migration of 18 metals, primary aromatic amines, colourfastness, terephthalic/isophthalic acid, ethylene glycol, and antimony. The report applies to the Global market and to the PET Preform product.

The second report is numbered TZA25001027. It is a food-contact plastic test report issued by Taizhou Customs Comprehensive Technology Service Center on 2025-06-25. The applicable standard is GB 4806.7-2023, with references to GB 31604.8-2021, GB 31604.2-2016, GB 31604.9-2016, GB 31604.7-2023, and GB 31604.41-2016. The listed scope includes sensory assessment, overall migration, KMnO₄ consumption, heavy metals (Pb), decolorization, and antimony (Sb). This report also applies to the Global market and to the PET Preform product.

The practical lesson is that a buyer should match the report to the exact model, market, and application. A report that covers Water Bottle Preform-401 is relevant evidence for that model. It does not automatically cover every 28mm PET preform variant, every color, or every customized neck dimension. Those variables should be confirmed in the quotation and, where necessary, in the compliance file.

Technical explanation: neck finish, weight, and blow-molding performance

The neck finish is the part of the preform that survives the blow-molding process as the bottle neck. That is why the 28mm dimension is a critical control point. The supplied FAQ guidance states that neck finish is tolerance-controlled, with dimension spot checks and cap fitment tests. The same guidance recommends buying preforms and caps as a matched set. This is a technical recommendation, not a sales preference: a cap that fits one 28mm neck may not seal correctly on another neck with a different thread or support ring geometry.

Weight consistency is the second technical control. The supplied FAQ states that automatic checkweighing rejects any out-of-range unit. That matters because weight variation can create thin walls that fail during blowing or stacking. A 28mm PET bottle preform that is outside the target weight may still look acceptable before blowing, but it can behave differently in the blow-molding machine and in the finished bottle.

The material properties listed for the PET preform range are high transparency, high strength, and easy blow-moldability. The application scenario also specifies food grade, BPA-free, and stable wall thickness as special requirements. For water, juice, edible oil, condiment, and daily chemical packaging, those attributes should be read together with the compliance reports and the blow-molding process. The facility profile also states that the process is designed to control acetaldehyde (AA) levels, which is relevant for beverage applications where taste and odor are sensitive.

Storage is part of the technical specification as well. The supplied application scenario lists indoor warehouse storage, normal temperature, and dry conditions. A 28mm PET preform should be protected from moisture and contamination before blowing. The preform is processed by a blow-molding machine, and the matched equipment listed in the scenario includes an injection molding machine and a bottle blow-molding machine. The buyer should confirm that the preform specification is compatible with the actual blow-molding equipment and bottle design.

Brand solution: what GuangDong Idea Plastic Packaging provides

GuangDong Idea Plastic Packaging is a PET preform manufacturer and supplier serving global markets. The company operates a PET preform manufacturing facility in South China and supplies food-grade PET preforms for bottle packaging applications. Its product scope includes 28mm among the available neck sizes, and the Water Bottle Preform-401 model is covered by the food-contact reports described above.

The supplied capability data for GuangDong Idea Plastic Packaging lists OEM/ODM production, customization for logo, packaging, graphic, neck size, weight, color, and mold, and a monthly capacity of 500,000 pcs/month. The MOQ is 10,000 pieces. Lead time is listed as 15 days for 10,001–200,000 pcs; above 200,000 pcs, delivery time is negotiable. Quality control is described as pre-shipment inspection, and after-sales support is remote support. Samples are available.

For a 28mm PET preform inquiry, those facts translate into a specific discussion. The buyer can ask for a 28mm neck specification within the 20–32mm range or a custom dimension in millimeters. The buyer can specify natural clear, green, blue, amber, or a custom color, and can request logo or printed branding. The buyer should also confirm the compatible cap type: PET caps, PP caps, and aluminum caps are listed as compatible. The preform and cap should then be validated as a matched set.

The application fit is broad but specific. The product is intended for the food and beverage industry, drinking water industry, condiment industry, and daily chemical packaging industry. Typical application scenarios include drinking water bottle packaging, oil bottle packaging, condiment packaging, and daily chemical packaging. The product type listing includes oil preform, and the product is intended for edible oil bottle applications. That does not mean every 28mm preform is automatically suitable for every oil or beverage product; it means the supplier range covers those scenarios and the buyer should confirm the exact model, neck, and compliance scope.

Application and use cases

The most direct use case for a 28mm PET preform is a PET bottle that is blown from the preform and then filled with drinking water, juice, edible oil, condiment, or daily chemical product. The preform is the raw material for blow molding; it is not the final container. The buyer's line therefore needs a preform specification that matches the bottle design, the filling process, and the cap.

In drinking water, the key constraints are food-contact compliance, clarity, and taste neutrality. The product specification lists high transparency and food-grade PET, and the facility profile states that the process is designed to control acetaldehyde (AA) levels. In juice and health supplement applications, the case records list stable filling performance and a qualified product rate. In edible oil, the product type includes oil preform, and the product is intended for edible oil bottle applications. In condiment and daily chemical packaging, the same food-grade PET preform range is applicable, but the buyer should still confirm chemical compatibility and closure performance.

The supplied case records cover a water treatment plant, a juice factory, an oil processing plant, and a health supplement factory. The reported results include stable filling performance and qualified product rate guaranteed. Those records are useful as application references, but they are not a substitute for line trials. A 28mm PET preform should be tested with the actual cap, blow-molding machine, and filling conditions before full-scale production.

Market trend analysis

The PET preform market is large and still expanding. Fortune Business Insights projects the global PET preform market size to reach USD 78.74 billion by 2034. Asia Pacific accounted for the largest market share in 2024, valued at USD 22.84 billion. Those figures describe the overall preform market, not the 28mm segment alone, but they explain why 28mm PET preform supply remains a competitive procurement category.

Material choice is the second trend. Virgin PET represents 72.0% of material demand in the PET preform market as of 2026. At the same time, the EU Single Use Plastics Directive requires PET beverage bottles to contain at least 30% recycled content by 2030. That regulatory direction creates a documentation question for buyers: a supplier's current food-grade PET preform may meet today's specification, but the buyer should ask how the supplier intends to address recycled-content requirements in the relevant market.

Application demand is the third trend. Edible oil application is emerging as a growth engine, with PET penetration exceeding 65% in developing economies. For 28mm PET preform buyers, this reinforces the need to look beyond water bottles. Oil preform applications may have different closure, barrier, and filling requirements, so the same 28mm neck dimension should not be treated as a universal solution.

Comparison with traditional solutions

A 28mm PET preform competes with other packaging formats at the container level, not at the preform level. Glass bottles, metal cans, and other plastic containers are finished packages, while the PET preform is an intermediate that becomes a bottle after blow molding. That difference affects equipment, inventory, and quality control.

The main limitation of the 28mm PET preform is not a defect; it is a boundary condition. The supplied FAQ guidance advises avoiding hot filling and prolonged acidic or high-alcohol contact for these preforms. That means a 28mm PET preform is not automatically suitable for every beverage or chemical product. The buyer should confirm the filling temperature, product acidity, alcohol content, and storage conditions before selecting the preform. The preform also requires a matched cap and a compatible blow-molding process. Those are real constraints, and they should be resolved before price negotiation, not after.

Future outlook

The 28mm PET preform is likely to remain a relevant neck format because it sits within the standard range of bottle preforms used for water, juice, edible oil, condiment, and daily chemical packaging. The more important change is not the neck size itself but the evidence around it. Buyers are increasingly likely to ask for model-specific food-contact reports, material declarations, cap-fit validation, and blow-molding trial data.

Regulatory pressure on recycled content will also shape procurement. The EU SUPD target of at least 30% recycled content by 2030 is a clear signal that material documentation will become part of the preform specification. Suppliers that can trace material, report scope, and model coverage will be easier to qualify. Buyers should also expect price to remain quotation-driven for 28mm PET preforms unless a public price band is explicitly provided. The supplied corpus does not include a public 28mm price band, and the verified data package identifies a price-trend data gap for 28mm PCO 1881 preforms in the China export market.

FAQ

What is a 28mm PET preform?

A 28mm PET preform is a PET bottle preform with a 28mm neck size. In the supplied product scope, 28mm is one of the listed neck sizes alongside 20 mm, 24 mm, 30 mm, and 32 mm. Neck dimensions can also be specified as custom dimensions in millimeters. The preform is an intermediate for blow molding, not a finished bottle.

Are these 28mm PET preforms food-safe?

The product is made of food-grade PET. The Water Bottle Preform-401 model is covered by food-contact plastic test reports 180327075a 001 and TZA25001027. Report 180327075a 001 was issued by TÜV Rheinland/CCIC (Ningbo) Co., Ltd. on 2025-04-23 under Regulation (EC) No 1935/2004 and Commission Regulation (EU) No 10/2011. Report TZA25001027 was issued by Taizhou Customs Comprehensive Technology Service Center on 2025-06-25 under GB 4806.7-2023. Buyers should confirm that the report scope matches the intended application and market.

How are neck dimension and weight consistency controlled?

The supplied FAQ guidance states that neck finish is tolerance-controlled, with dimension spot checks and cap fitment tests. Weight consistency is controlled by automatic checkweighing, which rejects out-of-range units. The same guidance recommends buying preforms and caps as a matched set.

What caps are compatible with a 28mm PET preform?

The product specification lists PET caps, PP caps, and aluminum caps as compatible cap types. Because 28mm is a nominal neck size, the specific cap fitment should be validated with the actual preform and cap combination.

What are the MOQ, lead time, and monthly capacity?

The supplied capability data lists a MOQ of 10,000 pieces and a monthly capacity of 500,000 pcs/month. Lead time is listed as 15 days for 10,001–200,000 pcs; above 200,000 pcs, delivery time is negotiable. OEM/ODM production and customization for logo, packaging, graphic, neck size, weight, color, and mold are listed.

Is there a public price band for 28mm PET preforms?

The supplied corpus does not include a public price band for 28mm PET preforms. Price should be treated as a quotation variable based on quantity, color, neck specification, and customization. The verified data package identifies a price-trend data gap for 28mm PCO 1881 preforms in the China export market.

What are the limitations of a 28mm PET preform?

The supplied FAQ guidance advises avoiding hot filling and prolonged acidic or high-alcohol contact for these preforms. The application scenario specifies indoor warehouse storage, normal temperature, and dry conditions. The preform requires a compatible blow-molding machine and matched caps. It is not a finished bottle and should be validated on the actual filling and blowing line.

Is it preform or perform?

In packaging, the technical term is preform. Perform is a common search misspelling. The same product may be described as a bottle preform, PET bottle preform, or preforms for PET bottles.

Reference document: PET preform product brochure (PDF).