Plastic Caps & Closures Wholesale Suppliers
Find verified plastic caps and closures wholesale manufacturers and suppliers on Towobo. Compare PP and HDPE screw caps, snap-fit closures, dispensing caps, liner types, child-resistant (ISO 8317) formats, tamper-evident bands, induction seal liners, and MOQs from manufacturers in China and other origins.
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Browse Plastic Caps & Closures Suppliers →Plastic cap materials, thread standards, and liner types
Plastic screw caps and closures are produced predominantly in polypropylene (PP) and high-density polyethylene (HDPE) — the two materials covering the vast majority of food, beverage, household, and personal care packaging closure applications. PP closures are more rigid, better tolerating higher heat applications (hot-fill beverages, heat-sterilised products), and available in a wider colour range. HDPE closures are slightly more flexible and impact-resistant, widely used for household chemical and personal care applications. Key cap specification parameters are: finish/neck diameter and thread standard — the most important parameter for fitment compatibility. Common standards are PCO 1810 and PCO 1881 (carbonated beverage PET bottle caps, 28mm thread), 28mm 400 and 28mm 410 (common food and beverage standards), 38mm and 43mm (wide-mouth jar caps), and DN25/DN32/DN38 ROPP standards for aluminium ropp closures. Cap liners provide the sealing function between the cap and the bottle or jar rim. Liner types include: foam (PE foam, the most common general-purpose liner for non-carbonated beverage and food products), induction seals (a foil-foam-polymer laminate liner that is bonded to the bottle rim by electromagnetic induction after filling — providing a hermetic seal and tamper evidence), EPE (expanded polyethylene foam with a PE facing — for carbonated beverages and oxygen-sensitive products), and full-lining for chemical resistance in agrochemical and household chemical products.
Child-resistant closures, dispensing formats, and ordering guidance
Child-resistant closures (CRC) are mandated for pharmaceutical products (tablets, capsules, and liquid medicines), many household chemicals, and agrochemicals in most major markets. The primary CRC standard is ISO 8317 (with equivalent US CPSC 16 CFR Part 1700) — closures must be tested to confirm that young children cannot open them within a specified time, while adults can open them. CRC designs include push-and-turn closures (press down while turning to release), squeeze-and-turn closures (squeeze the cap sides inward while turning), and press-tab designs. For pharmaceutical applications, the closure manufacturer should hold ISO 8317 test certificates for the specific closure and matching container combination. Dispensing closures are functional closures that integrate a dispensing mechanism — flip-top (sports cap or snap-hinge) closures for liquid dispensers, pump dispensers for lotion and soap applications, trigger sprayers for household cleaners, and disc-top closures for food condiments. When ordering plastic caps at wholesale volume, specify: cap diameter and thread standard, material (PP or HDPE), liner type, colour (RAL or Pantone reference), and surface finish (gloss, matte, or soft-touch coating). For branded applications, custom colour matching and embossed or debossed logo features are available from most Chinese closure manufacturers. MOQs for standard stock caps are typically 5,000–10,000 units; custom colour or custom embossed caps are typically 10,000–50,000 units.
Frequently asked questions
What is an induction seal liner and when do I need one?
An induction seal (or induction foil seal) is a multi-layer liner (typically foil + foam + polymer laminate) placed inside a standard screw cap. When the capped and filled bottle passes under an electromagnetic induction sealer on the production line, the foil heats up and bonds the polymer layer to the bottle rim — creating an airtight, hermetic seal across the bottle opening. The cap is then screwed on over the seal. Benefits include: a hermetic barrier preventing oxidation and spoilage for oxygen-sensitive products; tamper evidence (the consumer must peel off the foil seal to access the product); and extended shelf life for food and pharmaceutical products. Induction seals are required for many pharmaceutical products and are widely used for food supplements, olive oil, and premium food products. They are not needed for products where air exposure is not a quality concern.
What is the most common PET water bottle cap standard?
The PCO 1881 (28mm thread) is the most widely used cap finish standard for PET still and slightly carbonated water bottles worldwide — it replaced the earlier PCO 1810 standard as the lightweight closure standard for the global water bottle industry. PCO 1881 caps are slightly shorter and lighter than PCO 1810 caps — reducing plastic weight per bottle. For carbonated soft drinks and carbonated water requiring higher torque and carbonation retention, PCO 1810 or Bericap equivalent standards are still used by some producers, but PCO 1881 has sufficient carbonation retention for most standard carbonated water applications. Confirm the correct cap finish standard with your PET bottle supplier before ordering caps.
Can I get single-colour custom caps at low MOQ?
Standard stock colours (white, natural, black, blue, red, yellow) in widely-used closure sizes (28mm PCO, 28mm 410, 38mm) are available from distributors at low or no MOQ — you can purchase standard stock colours in cases of a few hundred or thousand units. Custom colour matching (matching a specific RAL or Pantone colour) typically requires a MOQ of 5,000–10,000 units and a colour matching fee. Custom embossed or debossed closures require tooling investment (typically $800–2,000 per mould) and MOQs of 10,000–50,000 units. For startup and small-brand applications requiring custom colour, a mid-range stock colour may be a practical initial solution while volumes build to justify custom colour production.
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