PS Liners for Caps

PS Gaskets for Bottle Caps

PS gaskets (polystyrene cap liners) are solid, rigid sealing discs placed inside screw caps. They seal by compression when the cap is torqued down — no induction sealing machine is required, which makes them the most economical liner choice for existing capping lines. PS gaskets provide a smooth, flat sealing face that resists moisture absorption, keeping dry goods, powders and viscous products protected through storage and transport. Sizes are die-cut from 15mm to 180mm, with a wide thickness range of 0.5mm to 3.0mm to suit everything from narrow bottle caps to wide-mouth jar closures.

Quick facts: MOQ 50,000 pcs  |  Lead time 15–20 days  |  Free samples  |  Custom sizes, colors & printing available

Specifications

Applications

Used by cap and closure manufacturers, food & beverage factories, cosmetics producers and household chemical plants across South America, Southeast Asia, Europe, the United States and Russia. Typical applications include spice and seasoning jars, milk powder cans, confectionery tubs, cosmetic cream jars, detergent bottle caps and other dry or viscous product closures.

Key Advantages

• Most economical sealing solution — simple compression sealing on existing capping lines: no induction sealer, no energy cost, no parameter tuning.
• Smooth, uniform sealing face — rigid PS material gives a flat, consistent surface that seats evenly and seals reliably cap after cap.
• Moisture resistant — solid polystyrene does not absorb water, protecting powders and dry goods from caking.
• Rigid & dimensionally stable — holds its shape during high-speed cap lining and transport without curling or deforming.
• Wide size & thickness range — 15–180mm and up to 3.0mm thick covers narrow bottle caps through wide-mouth jars.
• Composite upgrade path — can be laminated with PE foam or aluminum foil for enhanced sealing or barrier performance.
• Full customization — diameter, thickness, color and printing all customizable.

PS Gasket or Other Liner? A Quick Selection Guide

Not sure which fits your product? Send us your contents, bottle and cap drawings — we will recommend the right option and provide free samples.

Why Choose Taizhou Rimzer

Taizhou Rimzer Rubber & Plastic Co., Ltd is a professional bottle packaging supplier with over 20 years of industry experience. Our 23,000 m² factory with 85 skilled employees delivers over one billion pieces per year to 100+ customers worldwide. We supply bottle factories, agrochemical plants, food & beverage factories, cosmetics factories and trading companies — from bottles to seal liners, one reliable source.

Frequently Asked Questions

Do PS gaskets need an induction sealing machine?

No. PS gaskets seal mechanically when the cap is screwed on — the liner is compressed against the bottle mouth. No induction equipment is required, making them ideal for production lines without sealing machines.

Are PS gaskets suitable for liquid products?

PS gaskets work best with dry goods, powders and viscous products. For thin liquids, essential oils or long shelf-life liquid products, we recommend aluminum foil induction liners or PE foam gaskets — tell us your contents and we will advise.

Can PS gaskets handle hot-fill or pasteurization?

PS softens at elevated temperatures, so it is not the right choice for hot-fill or pasteurization processes. For those applications we recommend PE foam or induction liner solutions — share your process profile and we will match the correct liner.

Which cap materials do they fit?

They fit PP, PE and PET screw caps as well as wide-mouth jar closures. Share your cap drawing or thread standard and we will die-cut to match.

Can the gasket be laminated with other materials?

Yes. PS discs can be laminated with PE foam for better gap-filling, or with aluminum foil for a higher moisture and oxygen barrier. Composite structures are a common upgrade for demanding contents.

What shapes are available?

Standard supply is circular discs die-cut to your diameter. Other die-cut shapes are available for special closures — send us the shape drawing for a quotation.

Are they food safe?

Food-grade versions are available that comply with FDA and EU food-contact requirements; SGS test reports are available on request.

What colors can I choose?

White, black and natural are standard; custom colors are available for brand matching at higher volumes.

What is the MOQ? Are samples free?

MOQ is 50,000 pcs. Samples are free; sample quantity and courier cost are negotiable depending on your location and project.

What is the cutting diameter tolerance? Will liners rattle or jam in the cap?

Precision die-cutting keeps diameter within tight tolerance (typically ±0.1mm). Consistent sizing means the gasket seats correctly in the cap — no rattling, no jamming.

Can the gasket surface be printed with our logo, batch number or warning text?

Yes, custom printing is supported — logos, batch numbers and warning texts are all possible. Contact us with your artwork.

Is quality consistent between batches? How do you control quality?

Yes. We control raw material batches at incoming inspection, run in-process capability checks, and keep retention samples from every batch so any future batch can be verified against the approved sample.

What are the lead time and trade terms?

Standard lead time is 15–20 days after order confirmation. Trade terms EXW / FOB / CIF / DAP; payment T/T and L/C accepted.