PET Bottles Buying Guide: How To Choose PET Preforms

Many buyers ask for PET preforms in a very simple way: "I need a 28mm preform for a 500ml bottle." This sounds clear, but in real production, it is far from enough.
许多买家以非常简单的方式提出需求："我需要一个 28 毫米的预成型件,用于制造 500 毫升的瓶子."这听起来似乎很简单,但在实际生产中,这样的要求远远不够.

Whether a PET preform can be blown into a stable bottle depends on more than bottle size and neck diameter. Buyers also need to check the neck finish, preform weight, AA level, IV value, material grade, cap matching, filling method, and blow molding machine model.
一个 PET 预成型件能否被吹塑成稳定的瓶子,取决于多个因素,而不仅仅是瓶子的大小和瓶颈的直径.买家还需要关注瓶颈的处理工艺,预成型件的重量,酸度等级,粘度值,材料等级,瓶盖的匹配性,填充方式以及吹塑机的型号.

A PET preform is an injection-molded semi-finished bottle part. Its neck, thread, and support ring are already formed before blowing. The body is later heated and blown into the final bottle shape. This means that if the preform is selected incorrectly, many problems cannot be fully fixed during the blowing process. Confirming the right specifications before ordering can help reduce leakage, deformation, unwanted odor, gas loss, and production line mismatch.
PET 预成型件是一种通过注塑成型的半成品瓶体部件.其颈部,螺纹部分以及支撑环在吹塑之前就已经成型了.而瓶身部分则会在后续加热并吹塑成最终的形状.这意味着,如果选择错误的预成型件,那么在吹塑过程中可能会出现许多问题,这些问题很难在后续工序中得到完全解决.因此在订购之前确认正确的规格,有助于减少泄漏,变形,不良气味,气体逸出以及生产线不匹配等问题.

 

The first step in choosing a PET preform is not checking the price. It is confirming what the final bottle will hold.
选择 PET 预成型件的第一步并不是检查价格.重要的是要确定最终成品的容量是多少.

Drinking water preforms are mainly used for mineral water, purified water, and natural water. Since water has a very light taste, it is sensitive to AA level. If the AA level is not well controlled, the finished water may have a slight plastic-like odor or taste. For this reason, water bottle preforms should focus on low AA, high clarity, lightweight design, and stable performance on high-speed blowing lines. Common neck finishes include 28mm, 29/25, and 30/25.
饮用水预成型产品主要用于矿泉水,纯净水以及天然水的加工.由于水的味道非常清淡,因此很容易受到 AA 等级的影响.如果 AA 等级控制不当,最终生产出的水可能会带有轻微的塑料味或味道.因此,这种预成型产品的特点应该是低 AA 等级,高透明度,轻便的设计,以及能在高速吹制生产线中稳定运行.常见的瓶口尺寸包括 28 毫米,29/25 和 30/25.

Carbonated drink preforms are used for soda, sparkling water, and other carbonated beverages. The biggest difference between carbonated drink preforms and normal water bottle preforms is pressure resistance. During purchasing, buyers should check internal pressure strength, neck sealing, cap compatibility, and wall thickness distribution. Common neck finishes include 28mm PCO 1881 and PCO 1810. One important point is that "28mm" is not a complete specification. Different PCO standards may use different caps and production line settings.
碳酸饮料预成型容器用于生产苏打水,气泡水以及其他碳酸饮料.碳酸饮料预成型容器与普通水瓶预成型容器的区别在于抗压能力.在购买时,买家应检查其内部压力强度,瓶口密封性,瓶盖兼容性以及瓶身厚度的分布情况.常见的瓶口规格包括 28 毫米的 PCO 1881 和 PCO 1810.需要注意的是,"28 毫米"并非完整的规格标准,不同的 PCO 标准可能会使用不同的瓶盖和生产工艺.

Juice, tea, and hot-fill beverages need hot-fill PET preforms. A standard water bottle preform should not be used as a direct replacement for a hot-fill preform. During hot filling, the bottle is exposed to higher temperatures. If the preform does not have suitable heat resistance, neck structure, or bottle design support, the finished bottle may shrink, deform, or fail at the sealing area. Common neck sizes for these applications include 38mm and 48mm.
果汁,茶以及热灌装饮料都需要使用热灌装 PET 预成型件.标准的水瓶预成型件不能直接替代热灌装预成型件.在热灌装过程中,瓶子会受到较高的温度影响.如果预成型件不具备足够的耐热性,颈部结构或瓶子设计的支撑能力,那么成品瓶子可能会出现收缩,变形或密封区域失效的问题.这类应用的常见瓶颈尺寸包括 38 毫米和 48 毫米.

Edible oil preforms need stronger bottle support and better leak resistance. Oil bottles often face higher transport pressure and stacking pressure, especially 3L and 5L bottles. These bottles require more careful control of preform weight and wall thickness distribution. If the preform is too light, the blown bottle may become soft, the handle area may become too thin, or the bottle may deform during transport.
食用油预成型容器的瓶身需要更强的支撑结构,同时必须具备更好的防泄漏性能.食用油容器在运输和堆放过程中通常会承受较高的压力,尤其是 3 升和 5 升的容器.因此,对这些容器的重量以及壁厚分布需要更加精细的控制.如果预成型容器太轻,那么吹制出的容器可能会变得柔软,手柄区域可能会过于薄,或者容器在运输过程中可能会变形.

Cosmetic and daily chemical preforms must provide normal packaging performance, but appearance is also very important. Clarity, color stability, bottle shape consistency, and surface gloss all affect how the brand looks on the shelf. These preforms often need customized color, size, weight, neck finish, and logo support.
化妆品和日常化学品的包装原型必须具备正常的包装性能,但外观同样非常重要.透明度,颜色稳定性,瓶身形状的一致性以及表面光泽度都影响着产品在货架上的形象.这些包装原型通常还需要根据需求进行个性化的颜色,尺寸,重量,颈部设计以及标志的定制.

Pharmaceutical and health supplement preforms focus more on material compliance, sealing performance, and batch stability. Before ordering, buyers should confirm food-contact documents, test reports, cap matching, and target market requirements.
在选购药品和健康补充剂产品时,应重点关注材料的合规性,密封性能以及批次稳定性.在订购之前,购买者应确认相关文件,测试报告,包装容器的匹配性,以及目标市场的需求.

 

 

The neck is one of the most important parts of a PET preform. The bottle body is shaped during blow molding, while the neck is finalized in injection molding and cannot be modified afterward.
瓶颈是 PET 预成型件中最重要的部分之一.瓶身是在吹塑过程中形成的,而瓶颈则是在注塑成型后定型的,之后无法再进行修改.

 

Common PET Preform Neck Finish Reference Table
常见的 PET 预成型颈部成型工艺参考表

Neck Standard Model  颈部标准模型	Applicable Scenarios  适用场景
28mm PCO 1881  28 毫米 PCO,1881 年	Carbonated drinks, soft drinks, partial mineral water bottles 碳酸饮料,软饮料,部分瓶装矿泉水
28mm PCO 1810  28 毫米 PCO 1810	Old-style carbonated beverage production lines 传统式的碳酸饮料生产线
29/25, 30/25	Standard necks for drinking water bottles 用于盛装饮用水的标准型瓶身设计
38mm, 48mm  38 毫米,48 毫米	Juice, hot-fill beverages, edible oil, large-capacity bottles 果汁,热饮,食用油,大容量装瓶
55mm  55 毫米	18.9L / 20L water dispenser barrels 18.9 升/20 升的水泵桶

When placing an order, buyers should never simply mark "28mm PET preform". Two preforms with identical 28mm diameter may differ in thread design and cap matching performance. Choosing the incorrect neck standard will cause a series of problems: loose caps, liquid leakage, carbonation loss, capping machine blockage, and even total scrappage of the entire batch.
在下单时,买家绝不能只填写"28 毫米 PET 预成型件".虽然两个直径均为 28 毫米的预成型件在结构上可能相似,但其在瓶盖的匹配性能上可能会存在差异.如果选择错误的瓶颈标准,就会导致一系列问题：瓶盖松动,液体泄漏,二氧化碳释放,封盖机器堵塞,甚至可能导致整批产品报废.

To avoid errors, clients are advised to supply cap drawings, existing preform samples or full neck finish specifications before we issue a formal quotation.
为了避免错误,我们建议客户在提交正式报价之前,提供瓶盖图纸,现有的预成型样品或完整的颈部加工规格.

 

 

PET preform weight is not simply "the lighter, the better." It is also not true that a heavier preform is always safer. The proper weight is determined by bottle volume, product category, bottle design, filling process and transportation environment.
PET 预成型品的重量并非"越轻越好".此外,重量越大的预成型品也不一定越安全.合适的重量应该根据瓶体的容积,产品类别,瓶体设计,填充过程以及运输环境等因素来确定.

 

Standard Preform Weight Reference Table
标准预成型件重量参考表

Bottle Volume  瓶体容积	Matching Preform Weight  匹配的前体重量
200ml–330ml  200 毫升至 330 毫升	10g–14g  10 克–14 克
500ml  500 毫升	12g–20g  12 克–20 克
1L–1.5L  1 升到 1.5 升	20g–32g  20 克–32 克
2L	32g–45g  32 克–45 克
3L–5L  3 升–5 升	50g–100g or above  50 克–100 克或更多
18.9L / 20L water dispenser barrel 18.9 升/20 升的水泵水箱	650g–750g  650 克–750 克

 

Even bottles of equal capacity require different preform weights for different uses. A 500ml mineral water bottle can adopt lightweight design, while a 500ml carbonated drink bottle needs extra pressure resistance instead of material reduction. Similarly, a 5L edible oil bottle demands sturdier body support, reinforced handles and higher transport stability, which sets it apart from a 5L water bottle.
即使是容量相同的瓶子,由于其用途不同,所需的预成型重量也会有所不同.例如,500 毫升的矿泉水瓶可以采用较轻的设计,而 500 毫升的碳酸饮料瓶则需要更强的抗压能力,因此不需要减少材料用量.同样,5 升的食用油瓶则需要更坚固的瓶身结构,更牢固的把手以及更高的运输稳定性,这就使其与 5 升的水瓶有所不同.

 

 

Food-grade PET material is suitable for drinking water, beverages, edible oil, food packaging, and health supplement bottles. It offers good clarity, stable odor control, and better suitability for food-contact packaging projects.
食品级 PET 材料适用于饮用水,饮料,食用油,食品包装以及健康补充品的瓶身制作.该材料具有良好的透明性,稳定的气味控制能力,且更适用于食品接触包装的应用场景.

Low-AA PET is more suitable for mineral water, purified water, and light-flavor beverages. AA means acetaldehyde. If the AA level is too high, it may affect the taste of water or beverages.
低等级的无氨水 PET 包装更适用于矿泉水,纯净水以及口感清淡的饮料.AA 指的是乙醛.如果乙醛的含量过高,可能会影响到水的口感或饮料的风味.

High-IV PET is more suitable for carbonated drinks, large-volume bottles, and 5-gallon water bottles, because these packages need better strength and blowing stability.
高 IV 级 PET 材料更适合用于碳酸饮料,大容量瓶装饮料以及 5 加仑装的水瓶,因为这些包装需要更高的强度和更好的抗吹性能.

rPET can be used for some daily chemical packaging and non-food-contact packaging. If rPET is used for food-contact packaging, buyers must confirm the recycling source, migration test, and target market regulations.
rPET 可以用于一些日常化学品的包装以及非食品接触类的包装.如果 rPET 被用于食品接触类的包装,那么购买者必须确认其回收来源,迁移性测试结果,以及目标市场的相关法规要求.

Colored PET is often used for cosmetics, daily chemicals, and branded packaging. Before ordering colored preforms, buyers should confirm the color sample or color code and pay attention to batch-to-batch color consistency.
彩色 PET 材料常用于化妆品,日常化学品以及品牌包装材料.在订购彩色预成型品之前,购买者应确认所需的颜色样本或颜色代码,并注意不同批次产品之间的颜色一致性.

 

 

To reduce communication mistakes, buyers should confirm the following details before ordering PET preforms: final application, bottle capacity, neck finish, thread standard, target preform weight, filling method, material requirement, color request, blow molding machine model, cap drawing, target market, order quantity, and required test documents.
为了减少沟通失误,采购人员在订购 PET 预成型件之前,应确认以下细节：最终应用场合,瓶体容量,瓶口处理方式,螺纹标准,目标预成型件重量,填充方式,材料要求,颜色需求,吹塑机型号,瓶盖设计,目标市场,订单数量以及所需的测试文件.

The more complete these details are, the more accurate the quotation will be. Sample matching will also be faster. For wholesale orders, early specification confirmation is much more important than fixing problems after production.
这些细节越完整,报价就越准确.样品匹配的过程也会更加迅速.对于批发订单来说,在生产之前就得到规格确认比生产完成后解决问题要重要得多.

 

 

A reliable PET preform supplier should do more than offer a price. It should keep raw material control, production inspection, testing, and document support stable. For drinking water, beverage, edible oil, daily chemical, and health supplement packaging customers, unstable preform quality may affect blowing efficiency, neck sealing, bottle appearance, and bulk delivery.
一个可靠的 PET 预成型件供应商不仅应提供合理的价格.他们还应该确保原材料控制,生产检验,测试以及文档支持等方面保持稳定.对于需要包装饮用水,饮料,食用油,日常化学品和健康补充品的企业来说,不稳定的预成型件质量可能会影响到吹制工艺的效率,瓶身的密封性,产品的外观以及批量交付的质量.

As a food-grade PET preform manufacturer, Enlightening Pallet controls quality from raw material intake. Each batch of PET material is tested for IV value, AA level, moisture, and color value to make sure it is suitable for injection molding and bottle blowing. During production, Enlightening Pallet checks preform weight, wall thickness, neck dimensions, and appearance to reduce blowing problems caused by weight variation, neck deviation, or uneven wall distribution.
作为食品级 PET 预成型件的生产商,我们注重从原材料采购阶段就确保产品的品质.每一批 PET 材料都会经过检测,包括 IV 值,AA 等级,水分含量以及颜色特性等参数,以确保其适合注塑成型和吹塑工艺.在生产过程中,Enlightening Pallet 会仔细检查预成型件的重量,壁厚,颈部尺寸以及外观质量,从而避免因重量差异,颈部形状异常或壁厚分布不均而导致的吹塑问题.

Before shipment, Enlightening Pallet can provide COA, food-contact reports, third-party test reports, or other export documents based on the customer's order and target market requirements. For long-term wholesale buyers, Enlightening Pallet also focuses on keeping molds, materials, colors, lead times, and packing methods consistent, helping customers plan repeat production more smoothly and reduce risks in future orders.
在发货之前,Enlightening Pallet 可以根据客户的订单和目标市场需求,提供 COA 证书,食品接触报告,第三方测试报告或其他相关出口文件.对于长期批发采购的客户,Enlightening Pallet 还注重保持模具,材料,颜色,交货时间以及包装方式的一致性,从而帮助客户更轻松地规划后续生产,并降低未来订单中的风险.

 

 

Selecting PET preforms cannot only depend on price, bottle capacity or neck diameter. Preform selection directly affects bottle clarity, sealing performance, blowing stability, filling safety and transportation compression resistance.
选择 PET 预成型体时,不能仅仅基于价格,瓶身容量或瓶颈直径等因素来决定.预成型体的选择直接影响了瓶子的透明度,密封性能,吹塑稳定性,填充安全性以及运输过程中的压缩抵抗能力.

Before bulk purchasing, make sure to confirm the application scenario, complete neck finish standard, preform weight, material grade, filling method, cap compatibility, blow molding machine adaptation and target market regulations. Accurate and complete specifications reduce purchasing risks and ensure stable and smooth production. If you have any doubts about preform specification selection or parameter matching, or are unsure about the standards suitable for your production line, feel free to contact us. We will match the most suitable PET preform models according to your actual packaging and production conditions, helping you avoid production failures and control overall purchasing costs.
在批量采购之前,务必确认以下各项细节：应用场景,完成的瓶身规格,预成型产品的重量,材料等级,填充方式,瓶盖的兼容性,吹塑机的使用要求,以及目标市场的法规规定.准确而完整的规格说明能够降低采购风险,确保生产的稳定性和顺利进行.如果您对预成型产品的规格选择或参数匹配有疑问,或者不确定哪种规格适合您的生产线,请随时与我们联系.我们将根据您的实际包装和生产需求,为您推荐最合适的 PET 预成型产品,帮助您避免生产故障,并控制整体采购成本.

 

 

Q: What PET preform neck sizes are most commonly used?

A: Common neck finishes include 28mm, 29/25, 30/25 for water bottles, 38mm and 48mm for hot-fill and edible oil bottles, and 55mm for 5-gallon water containers.

 

Q: Can PET preforms be customized for different bottle designs?

A: Yes. We support full OEM customization including color, weight, bottle shape compatibility, and neck finish matching based on customer drawings or samples.

 

Q: What is the difference between light-weight and heavy-weight PET preforms?

A: Light-weight preforms reduce material cost and shipping weight, while heavy-weight preforms provide higher strength for carbonated drinks, edible oil, and large-volume bottles under pressure.

 

Q: How do you ensure consistent quality in bulk production?

A: We strictly control IV value, AA level, wall thickness, and neck precision for every batch, ensuring stable blow molding performance and consistent bottle output in mass production.