Dipped Cord

RFL-Dipped Reinforcement Cords for Rubber Products

Engineered for Reliable Rubber Reinforcement with Kingdom Dipped Cord

Kingdom Dipped Cords utilize high-modulus low-shrinkage (HMLS) polyester, high-tenacity polyester, high-ductility Nylon 66 and aramid dipped cords. Precision twisting imparts balanced axial tensile modulus and radial fatigue resistance, preventing belt pitch deformation, line rupture, and structural micro-cracking under intense cyclic loading.

RFL impregnation system delivers deep capillary penetration into filament interstices. The resulting chemically reactive coating co-vulcanizes seamlessly with Natural Rubber (NR), SBR, CR, BR, and NBR compounds, generating an irreversible chemical bond with adhesion strength exceeding industry benchmarks.

The Chemistry Behind the Bond

RFL dipping and heat treatment form the basis of the supplied dipped-cord products, supporting adhesion between reinforcement cords and selected rubber compounds.

Continuous RFL Dipping Process

Engineered resorcinol-formaldehyde-latex formulations achieve micro-wetting across every filament, providing saturated chemical bonding sites across the core-sheath interface.

Thermo-Fixation Heat Setting

Multi-stage precision thermal stabilization up to 150°C aligns molecular chains under constant tension, permanently locking hot air shrinkage down to 2.5% ± 0.5%

Cross-Elastomer Compatibility

Specially formulated dip coating enables direct co-vulcanization across diverse rubber compounds (NR, SBR, CR, BR, NBR), achieving peel adhesion up to ≥ 520 N/cm

Engineered Modulus & Stiffness

Available in both flexible soft-cord configurations for fluid hose braiding and high-rigidity stiff cords for high-speed automated belt processing

TECHNICAL SELECTION

Product Matrix at a Glance

Test Item	Unit	Construction
Test Item	Unit	1000D/2*3	1000D/3*3	1000D/2*5	1000D/4*3	1000D/5*3	1000D/6*3	1000D/8*3	1000D/9*3	1000D/12*3
BreakingStrength	N	≥420	≥630	≥680	≥850	≥1020	≥1200	≥1680	≥1860	≥2400
Elongationat Break	%	9.5±1.5	9.5±1.5	9.5±1.5	9.5±1.5	9.5±1.5	10±1.5	10±2.0	10±2.0	10±2.0
Elongationat Setload	%	3.1±0.5@200N	2.0±0.5@200N	2.2±0.5@200N	2.4±0.6@300N	2.0±0.6@300N	2.2±0.6@400N	2.4±0.6@500N	2.3±0.6@500N	2.0±0.6@500N
Weightper 100 m	g/100m	73±3	110±4	121±4	145±5	185±6	217±7	287±10	327±15	436±15
CordDiameter	mm	0.9±0.1	1.2±0.1	1.24±0.1	1.36±0.1	1.55±0.1	1.65±0.1	1.95±0.15	2.1±0.15	2.4±0.15
Hot air Shrinkage150℃3min 130g	%	≤3	≤3	≤3	≤2.8	≤2.8	≤2.6	≤2.8	≤2.8	≤2.8
T-Adhesionat150C30min	N/cm	≥240	≥260	≥280	≥300	≥320	≥350	≥400	≥420	≥480

Complete specifications under ISO, ASTM, DIN, and GB standards are available on request.

MATERIAL COMPARISON

Why Each Material, and When to Use It

Polyester Dipped Soft Cord

Exceptional dynamic flex-fatigue life; ultra-low hot shrinkage (2.5% - 2.8%); superior softness for tight-radius braiding

Automotive fluid and coolant hoses, medium-pressure hydraulic lines, industrial rubber couplings, and multi-layer conveyor belts

Polyester Dipped Stiff Cord

High flexural stiffness, outstanding anti-kinking behavior on automated braiders, extreme tensile capacity up to ≥ 2100 N, and peeling adhesion up to 520 N/cm.

Automotive brake hoses, transmission wrapped V-belts, variable-speed industrial belts, and heavy-duty reinforced tubing

Nylon Dipped Cord

Superior impact absorption, high elongation at break (15% - 22%), and high dynamic T-adhesion pull-out force (up to 190 N/cm at 150°C)

Electrical synchronous timing belts, motorcycle and specialty tyre cap plies, automotive impulse hoses, and high-shock rubber diaphragms

Aramid dipped stiff cord

High-strength aramid reinforcement cord designed for demanding rubber reinforcement applications.

ENGINEERED PERFORMANCE

Performance Highlights

≥ 2400 N

Maximum Breaking Strength

Proven on 1100 dtex 12×3 HMLS soft cord for extreme burst-pressure resistance in heavy-duty fluid lines

2.5% ± 0.5%

Ultra-Low Hot Air Shrinkage (150°C, 3min)

Eliminates mold deformation and post-cure dimensional distortion across rubber profiles

≥ 520 N/cm

Peak Interfacial Peeling Adhesion

Achieved by 1100 dtex 6×5 polyester stiff cords, securing zero cord pull-out under dynamic cyclic shear

190.0 N/cm

T-Adhesion Pull-Out Force (150°C, 30min)

Certified on 1680D/1×3 Nylon 66 cords, validating high-temperature thermal bond endurance

APPLICATION FIT

Typical Applications

Automotive & Hydraulic Fluid Hoses

Provides zero-slip burst resistance and low volumetric expansion in brake lines, coolant circuits, and high-pressure fuel delivery systems

THE KINGDOM ADVANTAGE

A Superior Alternative to Traditional Materials

Upgrading from grey raw yarns or standard cords to Kingdom RFL dipped solutions eliminates processing scrap and unlocks extended dynamic endurance for critical rubber parts

Get Started with Kingdom

01Unlike untreated yarns that rely purely on physical friction, Kingdom’s active RFL film forms covalent chemical bonds with rubber compounds during molding, boosting peeling adhesion beyond 400 - 520 N/cm
02Multi-zone thermal setting suppresses thermal shrinkage to a tight 2.5% ± 0.5%, preventing internal tube blistering, belt pitch elongation, and dimensional out-of-tolerance after curing
03Engineered stiff cords offer exceptional line straightness and zero twisting friction, cutting yarn breakage and downtime on multi-carrier braiders by over 35%
04Deep latex micro-penetration cushions intra-filament contact, completely preventing internal fiber-to-fiber fretting and doubling dynamic flex-fatigue life

YOUR RUBBER OUR CORD

Let's Make Them Bond

Tellus your tire type rubber compound and target adhesion value. We'll recommend the right material and specification or develop one if it doesn't exist yet.