Industrial Applications / Automotive Seat Covers

Zippers in OEM seat covers
must hold up to ten years of sun and passengers

Leather covers for automotive seats are sewn and trimmed at the seat maker, then stay in service with the vehicle for ten years or more. A seat-cover zipper has to withstand cabin heat and UV, make no noise on the road, take the tension of seated occupants, and meet interior flammability and odor specifications. This page covers selection points for each area of the seat, common validation tests, and where the KCC automotive invisible zipper, S60 automotive zipper, automotive spiral zipper and hollow-tube zipper fit.

ImageClose-up of an OEM seat cover seam and zipper locationam-hero · 16:9

Spec summary | Recommended on this pageKCC · AUTOMOTIVE

Seat-cover zipper grades: Invisible, S60, automotive spiralChosen by vehicle segment
Automotive invisible zipper: #5 close endEnquire about automotive-grade specifications
Automotive spiral zipper: #4, #7 close end
Seat-track cover: KCC hollow-tube zipperTube threaded through tape, then welded
Physical testing standard: BS EN 16732
Quality system: ISO 9001, ISO 14001, ISO 45001

Invisible Zipper series Spiral Zipper series Industrial Zipper

This page covers OEM seat covers for vehicle assembly, not aftermarket seat covers

Cabin environment

Seat-cover zipper requirements for cabin heat, UV, road noise and seating tension

Heat and UV

In a car parked in summer, interior surface temperatures can reach 70–80°C, and UV through the glass falls on the seats year after year. Tape and teeth must not fade or turn brittle over many years of service.

Noise on the road

Automakers treat BSR (buzz, squeak & rattle) noise as a quality defect. The puller must not rattle under road vibration, and the teeth must engage smoothly with no rubbing noise.

Seating tension

When an occupant sits down, the covers on front seatbacks and side bolsters carry far more tension than any garment. The zipper must not burst open under repeated loading.

Concealed, flush fit

OEM interiors do not allow a zipper to show or stand proud. Seams must lie flat and follow the curved contours of the leather.

Selection by seat area

Zipper sizes and suggested KCC products for each area of a car seat

On a single seat, each area places different demands on appearance, strength and how often the zipper is opened. The seat-area table lists common configurations and suggested KCC products. KCC automotive-grade zippers are not yet listed on the KCC product site, so the product names link to standard-grade product pages or category pages; please enquire about automotive-grade specifications.

Seat area	Common sizes	Selection focus	Suggested KCC products
Main seat cover (main seams)	#4 / #5 / #7	Appearance and closure strength both matter; choose the grade by vehicle segment	Automotive invisible zipper, S60 automotive zipper (spiral zipper category page), Automotive spiral zipper
Seatback side bolsters, lumbar support	#5	Tension is concentrated; closure strength comes first	Automotive invisible zipper
Headrest and armrest covers	#4 / #5	Tight-radius curved seams; must open and close smoothly	Automotive invisible zipper, Automotive spiral zipper #4
Seatback pocket	#4 / #5	Opened often in daily use; durability and smooth running matter most	Automotive spiral zipper #4
Child safety seat cover	#4 / #5	Harmful-substance test reports required; skin-friendly and washable	Automotive spiral zipper #4
Seat-track cover	Per structural design	The flexible cover must be fixed to the metal frame	KCC hollow-tube zipper

Actual sizes follow the automaker's or seat maker's drawings and material specifications. Airbag deployment seams are safety-critical and require a dedicated design specified by the seat maker and the airbag system supplier; they are outside the scope of this page's recommendations.

ImageExploded seat view marking zipper locations at the main seams, side bolsters, headrest, seatback pocket and seat trackam-seat-map · 21:9

Recommended KCC products

KCC seat-cover zippers in three grades and the hollow-tube zipper for seat tracks

KCC automotive seat-cover zippers come in three grades that can be combined by vehicle segment and seat area: the KCC automotive invisible zipper, the KCC S60 automotive zipper and the KCC automotive spiral zipper. Seat-track covers use the KCC hollow-tube zipper. KCC automotive-grade products are not yet listed on the KCC product site; the linked CC5-C, CF4 and CF7 pages are standard-grade product pages.

Comparison	Automotive invisible zipper	S60 automotive zipper	Automotive spiral zipper
Positioning	High-end	Mid-range; balances quality and cost	Entry-level; cost first
Appearance	Teeth hidden, flat seam	S60 woven construction	Standard spiral teeth
Closure strength	Higher than the S60 and automotive spiral zippers (high-tension tooth-sewing technology)	Designed to automakers' basic physical requirements	Designed to automakers' basic physical requirements
Best for	Premium models, high-visibility areas	Mainstream models	Cost-sensitive models, low-visibility areas
Size	#5 close end	Please enquire	#4, #7 close end

ImageAutomotive invisible zipper sewn into a finished leather coveram-p-invisible · 4:3

Invisible Zipper series · Specialty product

KCC automotive invisible zipper

The KCC automotive invisible zipper is developed specifically for OEM seat-cover assembly. KCC high-tension tooth-sewing technology raises its closure strength without an extra reinforcing layer, so the seam is less likely to burst open when occupants sit down. The teeth are fully hidden, the seam lies flat, and the design focuses on resisting fading and aging under long-term sun exposure.

Size: #5 close end (automotive grade)
Slider: One-piece slider
Seat areas: Main seat-cover seams, headrest, lumbar support

Premium modelsHigh-visibility areasHigh-tension areas

CC5-C invisible zipper product page (standard grade)

ImageClose-up of the S60 automotive zipper's woven constructionam-p-s60 · 4:3

Spiral Zipper series · Specialty product

KCC S60 automotive zipper

The KCC S60 automotive zipper uses an S60 woven construction, is designed to automakers' basic physical requirements, costs less than the KCC automotive invisible zipper and suits mainstream models. Please enquire about sizes and specifications.

Construction: S60 woven
Seat areas: Seat covers, headrests, lumbar supports

Mainstream modelsQuality–cost balance

Spiral zipper category page

ImageAutomotive spiral zippers #4 and #7 side by sideam-p-nylon · 4:3

Spiral Zipper series · Specialty product

KCC automotive spiral zipper

The KCC automotive spiral zipper is made to the physical specifications automakers require. It is the lowest-cost of the three grades and suits cost-sensitive models, or seatback pockets and other low-visibility areas. The CF4 and CF7 pages on the KCC product site show standard-grade products; please enquire about automotive-grade specifications.

Size: #4, #7 close end
Seat areas: Seat covers, headrests, lumbar supports, seatback pockets

Cost firstLow-visibility areas

CF4 product page (standard grade) CF7 product page (standard grade)

ImageHollow-tube zipper tape with a metal tube insertedam-p-tube · 4:3

Industrial Zipper · Specialty product

KCC hollow-tube zipper

The tape of the KCC hollow-tube zipper has a channel for a tube, and the standard teeth are polyester. With a weldable metal tube inserted, the flexible fabric can be welded to the seat's metal frame through the tube; with a flexible tube instead, the whole zipper can bend to follow the curve of the mounting surface.

Rigid tube: Welded or clipped into a track to join rigid structures
Flexible tube: Bends to fit curved surfaces

Seat-track coverMetal-frame mounting

Industrial zipper category page

Seat-track cover

Fixing seat-track covers to the seat frame with the KCC hollow-tube zipper

The tracks for fore-aft seat adjustment need a cover to keep dust and debris out. Seat-track covers are usually flexible fabric, which is hard to keep attached to a metal frame over the long term. The KCC hollow-tube zipper uses a metal tube as the intermediary: once the metal tube is threaded through the channel in the tape, the tube can be welded directly to the seat structure, with no separate retaining clip to design.

Check welding conditions
The tape must not be damaged by heat during welding; verify this with your actual welding process during sampling.
Check attachment strength
Welded attachment points must withstand the pulling and vibration of years of seat adjustment.
Check tube specifications
Choose tube diameter and material to suit the frame structure, and provide drawings at the selection stage.

ImageExample of an installed seat-track coveram-rail-photo · 16:9

Cross-section of the KCC hollow-tube zipper: the metal tube, threaded through the channel in the tape, is joined to the seat's metal frame at the weld point, and the teeth on the other side connect to the cover. The drawing is not to scale; actual tube diameter, weld positions and cover shape depend on the seat structure design.

Validation tests

Common seat-cover zipper validation tests at automakers and seat makers, with industry reference values

Each automaker has its own material specifications. The validation table lists common tests and industry reference values; these are not values measured by KCC. Actual requirements follow the automaker's or seat maker's specifications.

Test	Standard or method	Typical requirement	Notes
Interior flammability	FMVSS 302 / ISO 3795; GB 8410 for the China market	Horizontal burn rate ≤ 102 mm/min	Seat covers and all sewing trims are tested, including the zipper tape
Colorfastness to light	ISO 105-B02	Usually grade 4 or higher; grade 5 for premium models	Tape must not fade under long-term light exposure
Colorfastness to light at high temperature	ISO 105-B06	Per automaker specification	Simulates light exposure in a hot cabin
Odor	VDA 270	Per automaker specification	No unpleasant odor at high temperature
Volatiles and fogging	VDA 278	Per automaker specification	A separate test that complements the odor test
Lateral strength	Zipper strength test method (e.g. ASTM D2061)	Seat body ≥ 450 N Headrest, armrest ≥ 300 N	Industry reference value
Cycle durability	Reciprocating fatigue test	2,000–5,000 cycles without engagement failure	High-use areas such as seat adjustment often require 10,000 cycles or more
Corrosion resistance	ISO 9227 / ASTM B117 salt spray	48–96 h	For metal parts such as sliders and top/bottom stops
Noise (BSR)	Automaker-specific methods	Per automaker specification	No puller rattle; no rubbing noise when teeth engage
Harmful substances	REACH, OEKO-TEX	Test reports provided	Usually mandatory for child safety seats

Flammability reports

Seat covers have a long service life and go through cleaning, humidity and heat along the way. When requesting flammability test reports, check whether they cover the condition after washing or aging; the initial as-shipped condition alone is not enough. KCC offers flame-retardant tape options such as flame-retardant mesh tape; please confirm the test conditions against the automaker's specification.

Before you start

Automaker specifications, drawings and quality documents to prepare before evaluating automotive zippers

Automaker material specifications

Provide the applicable automaker's interior material specifications, including flammability, colorfastness, odor and VOC requirements, so the test items and sample submission conditions can be confirmed.

Drawings and seat-area list

Mark the zipper location, length, size and color for each area; for seat-track covers, include frame and tube drawings.

KCC company and quality systems

KCC (KEEN CHING) ZIPPER was founded in Taiwan in 1976 and is headquartered in Taipei. KCC operates zipper plants in Tongxiang, Zhejiang, China and Ho Chi Minh City, Vietnam, and has sales offices in locations including Europe, India and Hong Kong.

KCC's production system is certified to ISO 9001 (quality management), ISO 14001 (environmental management), ISO 45001 (occupational health and safety management) and the Global Recycled Standard (GRS), among other system certifications, and undergoes annual Worldly and BSCI assessments. KCC products also hold OEKO-TEX Standard 100 Class I product certification. KCC's in-house test equipment includes xenon arc aging testers, UV resistance testers, tensile testers and reciprocating cycle testers.

ImageQC lab: xenon arc aging tester, tensile tester and other test equipmentam-lab · 21:9

FAQ

Questions seat makers and buyers often ask

How does the automotive invisible zipper differ from a standard invisible zipper?

The main differences are closure strength and weather resistance. The KCC automotive invisible zipper uses high-tension tooth-sewing technology to raise closure strength, and its design focuses on resisting fading and aging under long-term sun exposure. Standard invisible zippers for apparel usually do not have to take this much tension, nor do they face cabin temperatures above 70°C.

How do I choose between the three seat-cover zippers?

Choose by vehicle segment and seat area: the KCC automotive invisible zipper for premium models or high-visibility areas, the S60 automotive zipper for mainstream models, and the automotive spiral zipper for cost-sensitive models or low-visibility areas such as seatback pockets. The three grades can also be mixed by area on the same seat.

Do zippers need flammability testing too?

Yes. Interior flammability regulations such as FMVSS 302, ISO 3795 and GB 8410 cover seat covers and all sewing trims, including the zipper tape. Please state the target market at the selection stage so the matching flame-retardant tape and test conditions can be confirmed.

How can zipper noise be reduced?

The key is a puller that does not rattle and smooth engagement between slider and teeth. During sampling, we recommend BSR testing on the complete seat assembly. If a particular area is especially sensitive to puller movement, you can discuss fixed-puller design options with KCC.

Can these zippers be used beyond the main seat-cover seams?

Yes. Headrests, armrests, lumbar supports and seatback pockets can all follow the same selection logic. Airbag deployment seams are safety-critical and require a dedicated design specified by the seat maker and the airbag system supplier.

Send us the automaker specifications and seat drawings

Share the seat areas, the automaker's material specifications, and your size and color requirements, and KCC will support selection, sampling and sample submission for validation.

Contact the KCC sales team

This page is general selection guidance. Test conditions and requirements are common industry reference values; actual standards follow the automaker's and seat maker's specifications. KCC product specifications are governed by the specification sheet and sample test results.