CyanSunLids
Paper Cup Lid Sizes and Compatibility
Lids are matched to the rim, not the ounce number. A 90 mm lid from one cup family may not fit a 90 mm cup from another; always test the lid on the actual cup.
The Short Answer
Measure the rim, then test the lid
Do not order lids from a different supplier without a fit test. The rim diameter, skirt depth and cup thickness all affect whether the lid stays on.
Lid Families
Most paper cups fall into a few rim families. Hot cups commonly use 80 mm or 90 mm rims; cold cups often use 90 mm or 98 mm. These are starting points, not a standard: a double-wall or ripple cup can sit outside the family.
| Rim family | Typical cups | Common lid types | Notes |
|---|---|---|---|
| 80 mm | 4–8 oz hot, small ice cream | Flat, sip hole | Often used for espresso and kids |
| 90 mm | 8–20 oz hot, 12–20 oz cold | Flat, dome, straw slot | The most common family |
| 98 mm | 20–32 oz cold, soup | Dome, flat, straw slot | Larger cold and food cups |
Hot vs Cold Lids
A hot lid usually has a sip hole and a secure rim for a hot drink. A cold lid may have a straw slot, a wider opening or a dome for ice and toppings. Using a hot lid on an iced drink can be awkward; using a cold lid on a hot drink may not seal the same way.
Lid Materials
- PS: common for cold drinks and domes; not for hot applications.
- PP: heat-resistant, common for hot cups and soups.
- PLA: compostable option; check heat limits and certification.
- Paper: plastic-free positioning; check fit, leak and hot performance.
How to Measure
- Outside diameter across the rim, not across the body.
- Rim thickness and skirt shape.
- Lid inner diameter and skirt depth.
- Test the lid on a filled cup, not an empty one.
- Check the fit after the cup has been in a hot cabinet or a cold room.
Leak and Travel
A lid is not a sealed container. For delivery, test a full cup on a tilt, a vibration table or a short ride. If the drink is hot and the lid is loose, the risk is not just a spill; it is a burn. Choose a lid with a tighter skirt or a different cup family.
Double Wall and Ripple
The outer wall of a double-wall or ripple cup can increase the outside diameter. A lid that fits the single-wall version may be too tight or too loose. Always match the lid to the exact wall type, not only the ounce size.
Common Mistakes
- Ordering lids by ounce number only.
- Using a hot lid on a cold cup, or the reverse.
- Mixing lid suppliers without a fit test.
- Assuming a 90 mm lid fits every 90 mm cup.
- Testing with an empty cup.
Quote Checklist
- Cup size and wall type.
- Rim diameter if known.
- Hot or cold drink.
- Flat, dome or straw-slot lid.
- Lid material: PS, PP, PLA or paper.
- Delivery or dine-in use.
The Lid Fit Test
A lid that clicks on is not a lid that seals. Run this test on a sample before you commit to a lid SKU, and repeat it on the first carton of production.
- Fill the cup to the fill line with water at serving temperature and fit the lid squarely, without forcing one side first.
- Invert the cup for 30 seconds over a sink and check the rim for seepage.
- Hold the cup by the lid and shake gently; a lid that lifts is too loose for delivery.
- Drop the sealed cup from waist height onto a hard floor and check that the lid stays seated.
- Stack three filled cups and leave them for ten minutes; the bottom cup should not distort or leak.
Record which lid code passed. Cup and lid are a matched pair, and a new cup die usually needs a new lid trial.
Rim Tolerance Is the Real Variable
Two factories can both quote a 90 mm cup and still differ by half a millimetre at the rim, which is enough to make one lid fit tight and another fit loose. If you buy cups and lids from different suppliers, send physical samples of both to each side before the order is placed.
FAQ
Frequently Asked Questions
Are all 90 mm lids the same?
No. The rim profile, skirt and cup thickness vary. Test the lid on the exact cup.
Can I use a hot lid on a cold cup?
It may fit, but the opening and seal are designed for different drinks. Use a cold lid for iced drinks.
What lid fits a 12 oz cup?
Most 12 oz hot cups use a 90 mm family, but double-wall and ripple versions can differ. Confirm the cup and lid together.
Are dome lids leak-proof?
They are not sealed containers. For delivery, test the filled cup and consider a tamper-evident or tighter lid.
Can I get compostable lids?
PLA and paper lids are available, but the heat limit and certification must match the cup and your market.
Do lids cost extra?
Yes. We quote lids with the cups so you see the cost per set.
Can you supply lids only?
Usually we quote lids with the cups to guarantee fit. If you need lids only, send the cup rim spec and a sample.