Type II vs Type III Tamper-Evident Caps: Which Do You Need?

Type II and Type III tamper-evident caps do the same job: they show your customer that a bottle hasn't been opened. They work in different ways.

A Type II cap is moulded as a single piece. Its ring has to be stretched over the rib on the bottle neck, which makes it harder to fit, and when the cap is first opened the ring can stick or only partly come away.

Type III is a "top hat" design: a wider base housing small plastic fins. The fins pass easily over the rib, then dig in like an anchor, so the ring separates cleanly when the cap is undone.

Type III costs more because it's more complex to mould. Type II costs less. I prefer Type III.

In this post, I'll explain how to tell the two apart, why the choice matters more than it first appears, and how to check which cap fits your bottle.

 

What's the difference between Type II and Type III?

 

The difference is how the tamper ring holds onto the bottle.

Every dropper bottle has a small rib of glass around the neck. The tamper ring sits under that rib. When your customer unscrews the cap for the first time, the rib stops the ring coming up with it, the ring breaks away from the cap, and they know the bottle hasn't been opened.

 

Type II is a single-piece cap. The ring is moulded as part of the cap and joined to it by one or two small fixing points. To fit it, you have to stretch the ring over the rib. When you fit one for the first time, hold the ring while you turn the cap, or you can break it. When your customer opens it, the ring can stick or only partly come away.

 

Type III is a two-part design. The ring rotates independently of the cap, and a wider "top hat" base houses small plastic fins that clip over the rib with very little resistance. Once the fins are past the rib, they dig in like an anchor, and the ring separates cleanly when the cap is undone.

 

Why have a tamper-evident cap at all?

 

Because it tells your customer nobody has been in the bottle before them.

A face oil goes on someone's skin. If the cap turns freely the first time they open it, with nothing to break, they can't tell whether it has been opened before: in the warehouse, at the post office, or by a previous buyer who sent it back. A ring that cracks is a small, physical promise that the product is exactly as you filled it.

 

It's also the first time your customer actually touches your product. They've seen your photos and your label. Then they twist the cap, and that moment either reassures them or it doesn't.

 

How do you tell Type II from Type III at a glance?

 

Look at the ring, not the cap.

On a Type II, the ring and the cap are one moulding. Hold the cap and try to turn the ring on its own. It won't move independently, because it's the same piece of plastic.

 

On a Type III, the ring is a separate part. It rotates on its own, and you'll usually be able to see the join between ring and cap.

If you're buying online and can't hold one, check the product title. We put the type in the product name. For example, our 30ml black tamper-evident dropper pipette is listed as Type III. If a supplier just says "tamper-evident" and doesn't give a type, ask before you buy.

 

Which matters most: how it looks, how it travels, or the first opening?

 

It is the first opening.

Cracking the seal is the first interaction your customer has with your bottle. With a Type III, the ring snaps away, stays on the neck, and the cap comes off cleanly. That's what they expect.

 

With a Type II, the ring can stick or only partly come away, which is a less clean first opening. Your customer is left wondering whether the seal did its job, at the exact moment they're deciding what they think of you.

 

Which should you choose, and will it fit your bottle?

 

I prefer Type III. The reason to choose Type II is price, and on a product people put on their face, I don't think the saving is worth a ring that can stick or come away only partly.

 

Whether a cap fits comes down to the neck finish on the bottle, which is given as a DIN size. Our listed tamper-evident pipettes are all Type III and DIN18, and they come in pipette lengths matched to 5ml, 10ml, 15ml, 20ml, 30ml, 50ml and 100ml bottles, in black or white.

 

If you'd like a Type II pipette, email us at info@qualitybottles.co.uk. Type II is also the cap on our plain ribbed tamper-evident caps and our tamper-evident dripper inserts, in black or white.

 

So the check is simple:

 

1. Find your bottle on our site and note the neck size.

2. Pick the pipette with the same neck size, in the length for your bottle size. A 30ml bottle needs the 30ml pipette, or the tube will be the wrong length.

3. Choose the type. Our listed tamper-evident pipettes are all Type III, and the name of a dripper insert or ribbed cap tells you whether it's Type II or Type III.

 

You'll find the full range in our pipettes collection, and the matching bottles in our glass dropper bottles.

 

What most new brands only find out the hard way

 

Type II is harder to put on, and the ring is less reliable at showing a bottle has been opened, because it can stick or only partly come away. Most people expect it to be the other way round.

It seems logical that a cheaper, simpler cap would be the easy one to fit. It isn't. Because the Type II ring has to stretch over the rib, you have to turn harder to get every cap seated. If you're capping by hand at your kitchen table, you'll feel it by the end of an order. And all that effort buys you a ring that doesn't always come away cleanly.

 

Type III clips over the rib with little resistance and then locks in place. It is easier to fit and harder to remove unbroken without evidence of opening, which is what you want from a tamper seal.

So the saving on Type II comes with a slower fill and a ring that doesn't always come away cleanly.

 

Frequently Asked Questions

 

Is a Type III cap worth the extra cost for a small brand?

In my view, yes. Type III costs more because it's more complex to mould, with two parts instead of one. What you get for that is a ring that locks onto the neck and cracks cleanly when your customer opens it, rather than one that can stick or only partly come away. For a face oil, serum or anything sold on how it looks and feels, that first opening is part of the product. The reason to choose Type II is mainly price.

 

Is Type III harder to fit when I'm filling by hand?

No, it's easier. This surprises a lot of people. The Type III ring clips over the rib on the bottle neck with very little resistance, then the fins dig in underneath so it can't come back off. A Type II ring has to stretch over that same rib, which takes more force on every bottle. If you're capping a few hundred bottles yourself, Type III is the kinder option for your thumbs as well as your customers.

 

Do Type II and Type III caps fit the same bottles?

Fit depends on the neck finish of the bottle, given as a DIN size, not on whether the cap is Type II or Type III. Our listed tamper-evident pipettes are all Type III and DIN18, in lengths for 5ml up to 100ml bottles. Before you order, check the neck size on your bottle's product page, then pick the pipette with the matching neck and the right length for your bottle. If you're unsure whether a cap will fit, ask us before you order rather than after.

 

Getting the right cap

 

The cap is the first part of your product your customer actually touches, so it deserves the same thought as the label. For most brands, that means Type III, matched to your bottle's neck size.

 

Once your cap is sorted, check the rest of the bottle: the size, the glass colour and the other closure options. You'll find all of that in Glass Dropper Bottles: The Complete UK Buyer's Guide.