A 12oz cup looks like the simplest item in a drinkware range. In practice it is where several small design decisions meet: how much liquid it holds, how well the walls and lid slow heat transfer, what touches the drink, and how the finish survives daily use.
Key takeaways
- 12oz is roughly 355 ml, a size that suits a single espresso-based drink or a standard cup of brewed coffee or tea.
- Both the inner liner and outer shell are SUS304 stainless steel; the lid is PP and the seal is food-grade silicone.
- Colors can be spray painted or powder coated, logos can be customized, and artwork can be applied by 3D printing or heat transfer.
- The minimum order quantity listed for this model is 3,000 pieces.
What a 12oz capacity means in daily use
Twelve US fluid ounces is about 355 ml. Nominal capacity is the volume to the brim, so the usable volume with a lid on is a little lower, and that matters when you fill a hot drink close to the top. For most people, 12oz is the size where the cup stays comfortable to hold, lighter to carry and quicker to finish while the drink is still at the right temperature.
The listed applications reflect this: office and home use, dorm rooms and campus, outdoor camping and picnics, the gym, and retail or front-desk settings. If your customers drink larger servings, the same construction is also offered in 14oz, 20oz and 550 ml versions (compared in the table below).
How double-wall insulation keeps drinks hot or cold
Heat moves by conduction (through contact), convection (through moving air or liquid) and radiation (through infrared energy). A single-wall steel cup does little against any of them, so a hot drink loses heat to your hand and the air, and a cold drink warms up.
A double-wall cup places a second steel wall around the inner liner, leaving a gap between them. When the air in that gap is removed during production, there is almost nothing left to carry heat by conduction or convection, which is why vacuum construction performs far better than a simple air-filled gap. Huading's Travel Mug category page states that its travel mugs use double-wall vacuum insulation, and the 12oz product page describes the cup as double-wall insulated and able to keep drinks hot or cold for hours. A useful side effect: the same barrier works in both directions, so the cup suits iced coffee as well as hot drinks.
A realistic expectation. No insulated cup is perfect. Heat still passes through the lid and where the inner and outer walls join, and a half-full cup or frequent opening shortens retention. The product page says "hours" and does not publish a tested figure, so if retention time is critical for your program, ask for the test method and results (starting temperature, ambient temperature, fill level and measurement intervals) and, ideally, test samples yourself.
Materials: SUS304 stainless steel, PP lid and silicone seal
The liner and shell are both SUS304, the Japanese designation for the austenitic grade commonly sold as 18/8 (about 18% chromium and 8% nickel). According to the Nickel Institute, Type 304 is the most common alloy for food and beverage applications. The chromium forms a thin protective oxide layer, which is what resists corrosion and keeps the steel from affecting taste in everyday use.
Stainless steel is only part of the picture. The parts that touch the drink or the lips also include the PP (polypropylene) lid and the food-grade silicone seal, and those need to meet the same standards. In the European Union, the framework rule is Regulation (EC) No 1935/2004, which requires that food contact materials do not transfer substances in amounts that endanger health, change the food's composition unacceptably, or degrade its taste and odor. The product page does not list test reports, so when you buy for a specific market, request current food-contact test reports and declarations of compliance for the steel, lid and seal, matched to that market's rules.
Product specifications at a glance
| Item | Specification |
|---|---|
| Capacity | 12oz (about 355 ml) |
| Inner liner | SUS304 stainless steel |
| Outer shell | SUS304 stainless steel |
| Lid | PP (polypropylene) |
| Seal | Food-grade silicone |
| Color options | Customizable by spray painting or powder coating |
| Logo and artwork | Logo customizable; 3D printing or heat transfer designs |
| Minimum order quantity | 3,000 pieces |
| Typical uses | Office, home, campus, camping, gym, retail and front desk |
The lid and seal: where most real-world problems start
The lid is the one part of the cup that is not double-walled, so it is both the most likely place for heat to escape and the most likely place for a leak. The 12oz cup uses a leak-proof lid with a food-grade silicone seal. The seal is a wear part: it compresses every time the lid is closed, so check that it sits fully in its groove after washing, and replace it if it becomes deformed or stained. For a branded program, it is worth running a simple leak test on pre-production samples (fill, close, lay the cup on its side and shake it), because lid fit can vary with tolerances.
Colors, logos and finishes
For retail and promotional programs the finish is what customers see first. Huading offers two coating routes on this cup, spray painting and powder coating, and the choice affects look and durability. Spray painting generally gives a smoother, more uniform surface, while powder coating tends to form a thicker, more scratch-tolerant layer with a slightly textured feel. Ask for sample swatches in your target color, because the final appearance depends on the coating process and the surface underneath.
For artwork, 3D printing and heat transfer are both available, and the logo can be customized. The OEM/ODM service also covers the cup lid, cup color, brand logo, cup pattern and packaging, and works from your own designs or samples. Before approving artwork, confirm placement, the number of colors and the artwork file format with the team, and ask how the printed area holds up to repeated hand washing.
Choosing between 12oz, 14oz, 20oz and 550 ml
The four sizes share the same material stack and minimum order quantity, so the choice comes down to how the cup will be used.
| Model | Capacity | Materials | MOQ | Listed highlights |
|---|---|---|---|---|
| 12oz | 12oz (about 355 ml) | SUS304 liner and shell, PP lid, silicone seal | 3,000 | Compact and drop-resistant; suited to office, home, campus and retail |
| 14oz | 14oz (about 414 ml) | SUS304 liner and shell, PP lid, silicone seal | 3,000 | Listed as fitting car cup holders; heat-resistant, non-slip design |
| 550 ml | 550 ml (about 18.6oz) | SUS304 liner and shell, PP lid, silicone seal | 3,000 | Listed as fitting car cup holders; suited to commuting and business travel |
| 20oz | 20oz (about 591 ml) | SUS304 liner and shell, PP lid, silicone seal | 3,000 | Listed as fitting car cup holders; largest serving in this range |
One detail worth noticing: the 14oz, 550 ml and 20oz pages list car cup holder fit, but the 12oz page does not. If in-car use matters to your customers, check the base diameter of the 12oz sample against the holders you care about before committing.
Who makes it, and how
Jiaxing Huading Vacuum Flask Technology Co., Ltd. was established in 2002 and is based in the Pinghu Economic Development Zone in Zhejiang, China. According to its company profile, the site covers 25,600 square meters with 480 employees. The quality management system is listed as certified to ISO 9001:2015 and the environmental system to ISO 14001:2015, with an occupational health and safety system under OHSAS 18001:2007. The company also reports that its products ship to more than 100 countries and regions.
The Smart Manufacturing section describes an in-house flow that covers raw material and tube-making, metalworking, welding, vacuumization, polishing, painting and assembly, plus automatic painting and powder coating lines, printing and testing lines. In 2022 the company reports investing over 20 million RMB in a metalworking automatic line, three assembly lines and five tube-making machines. Keeping these steps under one roof shortens hand-offs, which is useful when you need consistent color and a stable vacuum step across a large order. The R&D team can develop around 50 new products a year and handles mold opening in-house, which matters if a custom lid or shape is part of your project.
Care guidance that protects the insulation
- Wash before first use with warm water and mild dish soap, and clean after each use so residue does not build up.
- Hand wash when possible. High-temperature dishwasher cycles and strong detergents can wear lid seals and exterior finishes over time.
- Skip abrasive tools. Steel wool and harsh chemical cleaners can scratch the steel or damage the coating.
- Never microwave a stainless steel cup; reheat the drink separately before filling.
- Dry fully and store with the lid off so air can circulate and moisture does not collect.
These points follow the care notes on Huading's Travel Mug page. If you resell the cup, printing them on a care card or the packaging reduces returns.
A short checklist before you order
- Request pre-production samples in your target color and with your logo applied.
- Ask for food-contact test reports and declarations of compliance for the steel, lid and seal, matched to your target market.
- Run your own thermal test with a fixed fill temperature and fill level, and record readings at set intervals.
- Leak-test the lid on its side, then again after repeated hand washing.
- Confirm artwork method, print placement and packaging, and agree on the minimum order quantity (3,000 pieces for this model).
- Confirm the base diameter if car cup holder fit matters to your customers.
Frequently asked questions
Is a 12oz stainless steel cup suitable for both hot and cold drinks?
Yes. Double-wall construction slows heat transfer in both directions, so the cup works for hot coffee and tea as well as iced drinks.
Can I put my own logo on the cup?
Yes. The logo can be customized, and designs can be applied by 3D printing or heat transfer. Colors can be spray painted or powder coated.
What is the minimum order quantity?
The listed minimum is 3,000 pieces for this model.
Is the cup dishwasher safe?
Hand washing is recommended. Dishwasher heat and strong detergents can gradually wear seals and finishes, so hand washing keeps the cup performing longer.
Does SUS304 mean the same as 18/8?
They describe the same grade of austenitic stainless steel, roughly 18% chromium and 8% nickel. SUS304 is the Japanese industrial designation, and 18/8 is the common shorthand.
