The 12oz PET cup has become one of the most widely used cold beverage containers in the global food service industry. From bubble tea shops in Taipei to juice bars in Berlin, this versatile, crystal-clear vessel delivers on aesthetics, safety, and sustainability. This guide digs into the material science, dimensional specifications, application scenarios, and environmental profile of the 12oz PET cup — and explains what separates a premium supplier from a commodity one.
Polyethylene terephthalate (PET) is a thermoplastic polymer resin belonging to the polyester family. First synthesized in the 1940s and commercialised for packaging in the 1970s, PET has become the dominant material for transparent food and beverage containers worldwide. Its combination of optical clarity, chemical inertness, mechanical toughness, and recyclability makes it uniquely well-suited to cold-drink applications.
Food-grade PET — the grade used by reputable manufacturers such as Zhejiang Gaokai New Material Co., Ltd. — meets international food-contact standards and contains no bisphenol A (BPA). The material does not leach harmful substances into beverages under normal cold-drink service conditions, making it safe for consumers and compliant with food regulations in major markets.
| Property | Typical Value | Relevance to Cup Performance |
|---|---|---|
| Density | 1.33 – 1.40 g/cm³ | Lightweight yet strong wall construction |
| Tensile Strength | 55 – 75 MPa | Resists cracking under grip pressure |
| Light Transmittance | > 90 % | Crystal-clear visual showcase for beverages |
| Glass Transition Temp. (Tg) | ~75 °C | Maintains shape for cold drinks; not for hot fill |
| Oxygen Barrier | Moderate | Suitable for short-hold cold beverages |
| Chemical Resistance | High (acids, oils) | Safe for fruit juices, dairy-based drinks |
| Recyclability | 100% (resin code #1) | Widely accepted in municipal recycling streams |
Precise dimensions are critical for compatibility with standard lids, cup holders, POS dispensers, and sleeve printing templates. The GK98/12C 12oz PET Cup produced by Zhejiang Gaokai is engineered to interoperate with industry-standard 98 mm lid diameters — the most common specification in the Asia-Pacific and European markets.
| Item No. | Product Name | Capacity | Weight | Caliber | Bottom Ø | Height | Pcs / Sleeve | Qty / Ctn |
|---|---|---|---|---|---|---|---|---|
| GK98/12C | 98/12oz PET Cup | 12 oz (355 ml) | 11.5 g | 98.4 mm | 54.6 mm | 101.0 mm | 50 pcs × 20 | 1,000 pcs |
The tapered body (98.4 mm top, 54.6 mm base) enables efficient sleeve-stacking, reducing storage footprint by up to 70% compared to cylindrical alternatives. The smooth rolled rim provides a comfortable drinking experience and a secure, leak-resistant seal with both flat and dome lids.
Premium 12oz PET cups are produced through a two-stage process: injection stretch blow moulding (ISBM) or thermoforming from PET sheet stock. Zhejiang Gaokai operates its own advanced thermoforming lines, using high-clarity PET sheet as the raw input. Each production run is subject to dimensional inspection, wall-thickness gauging, and food-contact compliance verification.
| Process Stage | Key Parameter | Typical Specification |
|---|---|---|
| Sheet Pre-heating | Temperature | 130 – 145 °C |
| Forming | Mould clamping pressure | 5 – 8 bar |
| Cooling | Mould surface temperature | 15 – 25 °C |
| Trimming | Die clearance tolerance | ± 0.1 mm |
| Wall Thickness | Sidewall uniformity | 0.25 – 0.35 mm nominal |
| Stacking | Nesting depth per cup | ~45 mm (50 pcs / sleeve) |
At roughly 355 ml, the 12oz serving size is the single most popular cold-drink portion in café and bubble-tea retail globally. The 12oz PET cup is optimised for cold-fill applications — it should not be used with beverages above 60 °C, as PET's glass-transition temperature limits hot-fill use without special post-crystallisation treatment.
| Beverage Type | Compatibility | Recommended Lid | Notes |
|---|---|---|---|
| Pearl / Bubble Tea | ✔ Excellent | Flat sealing / dome with straw hole | Clear walls showcase layers and toppings |
| Iced Coffee & Cold Brew | ✔ Excellent | Dome lid or flat snap lid | Withstands ice load without distortion |
| Fruit Smoothies | ✔ Excellent | Dome lid with wide straw hole | Acid-resistant; showcases colour |
| Freshly Squeezed Juice | ✔ Excellent | Flat snap lid | Excellent citric acid resistance |
| Soft Drinks / Carbonated | ✔ Good | Dome lid (vented) | Short hold time; not for long carbonation retention |
| Milkshakes | ✔ Good | Dome lid | Rigid wall handles thicker viscosities |
| Hot Beverages (> 60 °C) | ✖ Not Recommended | — | Use CPET or PP cups for hot fill |
PET carries resin identification code #1 — the most widely recycled plastic in the world. A well-sorted, clean 12oz PET cup can be processed into rPET (recycled PET) pellets and re-enter production as new cups, fibres, or packaging material, reducing virgin resource consumption significantly.
Zhejiang Gaokai goes beyond standard PET by offering an RPET Series — cups manufactured from post-consumer recycled PET — and a PLA Series made from plant-derived polylactic acid for compostable applications. This product portfolio allows businesses to select the end-of-life pathway that aligns with their sustainability commitments and local waste infrastructure.
| Attribute | Virgin PET | RPET | PLA |
|---|---|---|---|
| Raw Material Source | Fossil-based (petroleum) | Post-consumer recycled PET | Plant-based (corn starch / sugarcane) |
| Carbon Footprint | Baseline | ~30% lower vs virgin PET | Lower (bio-based) but processing-dependent |
| Recyclability | ✔ Highly recyclable (#1) | ✔ Highly recyclable (#1) | Limited (industrial compost only) |
| Optical Clarity | Excellent | Very good (slight colour variance) | Good |
| Heat Resistance | Up to ~60 °C | Up to ~60 °C | Low (~45 °C) |
| Best For | General cold drinks | Eco-label / green branding | Compostable service contexts |
While the 12oz cup is the cornerstone of cold-drink service, businesses operating across multiple dayparts or serving different portion sizes benefit from a matched family of cups. Zhejiang Gaokai's PET Series spans from 7oz sampling cups to large-format U-shape cups, all sharing compatible lid diameters within each size group.
| Model | Capacity | Primary Use | Product Page |
|---|---|---|---|
| GK78/07C | 7 oz | Sampling, espresso beverages | Clear Plastic PET Cups |
| GK78/08C-A | 8 oz | Small cold drinks, children's portions | PET Drinking Cups |
| GK78/08C-B | 8 oz | Cold brew, short iced lattes | 8oz PET Clear Drink Cup |
| GK78/09C | 9 oz | Mid-size cold drinks | Disposable PET Cup |
| GK78/10C | 10 oz | Bubble tea, smoothies | 10oz PET Clear Drink Cup |
| GK98/12C | 12 oz | Standard cold-drink serving | 12oz PET Cup |
| GK90/360UC | 360 ml | U-shape cups, dessert drinks | U Shape Clear PET Cups |
| GK90/500UC | 500 ml | Large cold drinks, events | Round Bottom Plastic Cups |
In a commoditised market, differentiating a reliable supplier from a low-cost alternative requires evaluating several technical and commercial dimensions. Key criteria include material certification, production transparency, customisation capability, and logistics reliability.
| Criterion | Minimum Acceptable | Gaokai Standard |
|---|---|---|
| Food-Contact Certification | National standard compliance | GB 4806 + EU Reg 10/2011 tested |
| Customisation | Standard sizes only | Custom dimensions and printed designs accepted |
| Lead Time (Inquiry Reply) | 24 – 48 hrs | Within 12 business hours |
| MOQ Flexibility | Large runs only | Flexible per customer requirement |
| Vertical Integration | Trading company (no factory) | Own factory + international sales dept. |
| Sustainability Options | PET only | PET, RPET, and PLA ranges available |
| Global Reach | Domestic or regional | Global sales network, export-ready documentation |
Headquartered at No. 38, Xianxia Road, Jianshan New District, Haining City, Zhejiang Province, China, Zhejiang Gaokai New Material Co., Ltd. operates its own production facilities and manages direct international sales — eliminating the middlemen typically found in trading-company supply chains. This vertical integration translates into tighter quality control, shorter lead times, and more competitive pricing for buyers worldwide. Learn more on the Why Choose Us page.
