Blister vs clamshell packaging: materials, costs and MOQs
A blister is a formed bubble sealed to a printed card; a clamshell is a hinged shell that closes around the product. They look alike on a peg hook and differ in cost, security and how angry your customer gets opening one.
Filed under Blister and clamshell packaging
Clear plastic packaging on a peg hook is usually one of two things: a blister sealed to a printed card, or a clamshell, a hinged plastic shell that closes around the product. On the shelf they look similar. They cost differently, protect differently and open differently. This note covers the formats, the materials, what drives cost and the minimums to expect. Jack's numbers come from his own forming factory, where the thermoforming machines are in house, and they are stated as approximate ranges.
What each one is
A blister pack is "any of several types of pre-formed plastic packaging used for small consumer goods, foods, and for pharmaceuticals" (Wikipedia). For retail goods such as toys and hardware, the product sits between a paperboard card and a clear formed plastic cavity. VisiPak lists the common variants:
- Face seal: the bubble's flange is heat-sealed to the face of the card.
- Full face seal: the plastic covers the whole card face, which adds "added strength around the hang tab."
- Trapped blister: the product is held mechanically between blister and card rather than heat-sealed.
- Slide blister: the card slides into formed rails in the plastic.
A clamshell is "a one-piece container consisting of two halves joined by a hinge area which allows the structure to come together to close" (Wikipedia)). It can close with self-locking tabs, snaps, friction fits, adhesive, staples or heat sealing, and a retail clamshell usually carries a printed insert card inside.
There is a third format worth knowing: the blister tray, a formed tray that holds and locates parts inside a box, with no card and no seal. Jack's line makes all three: clamshells, blisters with a paper seal, and blister trays.
Side by side
| Blister card | Clamshell | |
|---|---|---|
| Structure | One formed face sealed to a printed, coated card | Two formed halves on a hinge, printed insert inside |
| Plastic | Less, since only one face is formed | More, since the whole package is plastic |
| Closing | Heat seal to the card, or trapped | Tabs, snaps or friction fit; or RF, ultrasonic or heat seal |
| Security | The card can be torn open | A sealed clamshell is tamper resistant and deters pilferage |
| Opening | Easy | Hard when sealed |
| Graphics | The card is the billboard | An insert behind clear plastic |
| Suits | Light, flat items at high counts | Heavier, awkward or high-value items |
The security row is the reason clamshells exist. Wikipedia notes that heat-sealed plastic clamshells "are tamper resistant and deter package pilferage," and describes the hinged blister as a security package for small high-value items.
Materials: PVC, PET and RPET
Jack's lines form mostly in PVC or PET, and he offers RPET, the recycled PET, at a higher price than virgin material. Sheet runs from about 0.25 to 0.5 mm thick; heavier or sharper products need the upper end.
- PVC is valued for "low cost and the ease of thermoforming" (Wikipedia). It carries resin code #3 and, in VisiPak's words, is "less likely to be recycled."
- PET carries resin code #1, which VisiPak calls "the most commonly recycled plastic in the world." It is the usual choice when a retailer or brand wants a recyclable claim.
- RPET is PET made from recycled content. It costs more, and it helps if the brand has recycled-content goals.
- PETG (#7) turns up mostly in medical packaging.
Two cautions. First, recyclable is not the same as recycled: VisiPak notes that "Not all recycling programs accept clamshell packaging, even if it is made from recyclable materials." Second, sealing depends on the material. PVC has long been the easy material to seal with radio frequency (RF) equipment; VisiPak reports a development announced in 2024 that "enables PET to be sealed with RF welding, Ultrasonics, and heat." If you are moving an existing clamshell from PVC to PET, check how it will be sealed before you order sheet.
What drives the cost
Tooling is small next to injection molding. A thermoforming mold for a blister runs from a couple of hundred dollars to about $1,000 on Jack's line, depending on size. Compare that with the thousands to tens of thousands in what an injection mold really costs. If the product fits a stock shape you can skip tooling entirely; Andex Industries offers "stock sizes for $0 tooling costs," and VisiPak lists "Over 200 plastic clamshells in stock."
Material and gauge. The plastic is the largest variable line. A clamshell uses more of it than a blister card for the same product, thicker sheet costs more, and RPET costs more than virgin PET.
The card. Blister cards are printed, coated so the blister seals to them, and punched with a hang hole. Jack's line handles the card printing, color coating and hang holes as part of the job, which avoids a second supplier.
Sealing and labor. VisiPak suggests "a handheld clamshell sealer for low volume applications" and "high speed RF heat sealing equipment" for high volume. Who seals, and on what equipment, changes the unit price more than buyers expect.
Security features. Jack's line can build in tamper-evident features, a security tag or code, or a barcode inside the blister card. Each adds a step; ask for it at the quote stage, not after samples.
We are not publishing a per-unit price. It depends on the product's size, the gauge, the card and the quantity, and a number without those would mislead you.
Minimums and timing
Jack's minimum is normally around 1,000 pieces, and a rush sample takes about three days. For comparison, a US maker, VisiPak, quotes "7 to 11 days" for an initial prototype and "8 to 12 weeks" for production tooling. Allow for the card printing and ocean freight on top of forming, and for retail compliance testing if the pack is going into a big-box program or through Amazon's network. See minimum order quantity for how minimums behave in general.
The opening problem
A sealed clamshell protects the product from thieves and, too often, from the customer. Wikipedia's article on wrap rage cites a Consumer Product Safety Commission estimate that attempts to open packaging caused "about 6,500 emergency department visits in the U.S. in 2004" (Wikipedia). Amazon runs a Frustration-Free Packaging program for this reason. If theft is not the main risk for your product, a blister card or a clamshell with snap or tab closures is kinder to the buyer and usually cheaper to pack.
Which one does your product need?
- Light, flat and sold in volume: a blister card. Less plastic, the card carries the graphics, and it packs fast.
- Heavy, awkward, high-value or often stolen: a sealed clamshell.
- The customer needs to handle it or reclose it: a clamshell with snap or tab closures.
- Parts that need locating inside a box: a blister tray.
What to send for a quote
- The product, or a CAD file and its weight.
- The format you have in mind, or the problem you are solving (theft, visibility, cost).
- Material preference: PVC, PET or RPET, and any recyclability claim you need to make.
- Card artwork, hang-hole style and where the barcode goes.
- Quantity per order and per year, and any tamper-evident requirement.
Send it through the quote form. The blister and clamshell packaging page covers how Jack's forming line works, and the custom packaging page covers the boxes and cartons around it.
A blister card sells the product; a clamshell guards it. Pay for the guard only when the product needs one.
Straight answers
What is the difference between a blister pack and a clamshell?
A blister pack is a formed plastic cavity sealed or trapped against a printed paperboard card. A clamshell is a one-piece plastic container with two halves joined by a hinge that closes around the product, usually with a printed insert inside.
Which is cheaper, a blister card or a clamshell?
For the same product a blister card usually costs less, because only one face is formed plastic and the card carries the graphics. A clamshell uses more plastic and often more sealing labor, and it earns that back where theft or protection matters.
What plastic are blister packs and clamshells made from?
Mostly PVC or PET. PVC is low cost and easy to thermoform but is resin code #3 and less often recycled. PET is resin code #1 and widely recycled. RPET, recycled PET, costs more. Jack's line forms sheet from about 0.25 to 0.5 mm thick.
How much does a blister mold cost?
On Jack's line a thermoforming mold for a blister runs from a couple of hundred dollars to about $1,000 depending on size, far below an injection mold. Stock shapes can avoid tooling altogether.
What is the minimum order for custom blister or clamshell packaging?
Jack's minimum is normally around 1,000 pieces, with rush samples in about three days. Minimums vary by supplier, size and card printing.
How this note was made: researched and drafted with AI assistance, checked against the sources listed below and edited at JCH Design & Manufacturing.