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RUBASIA RUBBERTECH INDUSTRIES

Precision Rubber Bush & Coupling Bush

Model Series: 124 132 118 120 122 144 316
Category: Rubber Bush Rubber Coupling Bush Anti-Vibration Rubber Mount
Manufacturer: RUBASIA RUBBERTECH INDUSTRIES
Region Focus: Malaysia, Sabah, Sarawak, Brunei Darussalam

Technical Overview

RUBASIA Rubber Bush & Coupling Bush are precision-engineered vibration isolation components designed to connect moving mechanical parts while minimizing noise, vibration, and mechanical shock.

Each bush integrates a high-grade elastomer compound bonded to machined steel or stainless-steel sleeves under controlled temperature and pressure through vulcanization bonding technology.
This ensures superior adhesion, dimensional accuracy, and durability under cyclic load conditions in tropical, humid, and corrosive environments such as Sabah, Sarawak, and Brunei.

Technical Construction & Design Parameters

Component	Description
Outer Sleeve	Machined or precision-drawn steel tube, zinc-plated or phosphate-coated to resist corrosion.
Inner Sleeve	Machined steel or stainless steel for high torque transmission. Optional bonded threaded insert or flanged type.
Elastomer Core	High-performance rubber compound (NR, NBR, EPDM, Neoprene) designed for shear, compression, and torsion load.
Bonding System	Chemical primer + bonding adhesive cured under 160–180°C vulcanization for maximum adhesion strength.
Manufacturing Process	Compression moulding or injection moulding under controlled pressure (90–120 bar).
Dimensional Tolerance	±0.1 mm (Outer Diameter)

Material Options & Mechanical Properties

Rubber Compound	Tensile Strength (MPa)	Elongation at Break (%)	Hardness (Shore A)	Temperature Range (°C)	Key Features
Natural Rubber (NR)	18–22	600	55 ±5	-40 to +80	High elasticity, best damping capacity
Nitrile Rubber (NBR)	14–18	400	60 ±5	-30 to +110	Excellent oil and fuel resistance
EPDM Rubber	12–16	500	65 ±5	-40 to +130	Superior ozone, UV, and weather resistance
Neoprene (CR)	13–17	450	65 ±5	-35 to +120	Balanced oil, weather, and flame resistance

All rubber compounds comply with ASTM D2000 and ISO 3302 Class M2 standards.

Performance & Dynamic Characteristics

Parameter	Typical Value	Test Method
Static Load Capacity	1.0 – 20 kN	Compression Test (ASTM D575)
Dynamic Spring Rate	30 – 120 N/mm	ISO 4662
Shear Deflection Limit	≤ 8°	Internal Test
Axial Compression Limit	≤ 6 mm	Internal Test
Fatigue Life (Cyclic Load)	> 1,000,000 cycles	ISO 10846-5
Damping Ratio (ζ)	0.08 – 0.15	Vibration Test
Bond Strength (Rubber-Metal)	≥ 8 MPa	ASTM D429 Method B
Ozone Resistance	No cracks after 96 hrs @ 50 pphm	ASTM D1149
Aging Resistance	≤ 15% change in hardness after 168 hrs @ 100°C	ASTM D573

Structural & Dimensional Configurations

1. Straight Bush (Cylindrical Type)

Used for suspension arms, brackets, and control links.
Uniform wall thickness for balanced stiffness.
Common sizes: Ø25 – Ø80 mm OD Length 30–120 mm.

2. Barrel-Type Bush

Parabolic outer profile to reduce edge stress concentration.
Ideal for dynamic loading and rotation applications.
Reduces shear stress by up to 20% compared to straight bush.

3. Flanged Bush

Equipped with one or two flanges for positive axial location.
Prevents displacement under axial compression.

4. Coupling Bush (Flexible Coupling Insert)

Designed for torsional flexibility between motor and driven shaft.
Reduces resonance and torque pulsation.
Commonly used in motor-pump or motor-fan assemblies.

Vibration & Shock Absorption Performance

Frequency Range	Isolation Efficiency
10–20 Hz	60% – 70%
20–50 Hz	75% – 85%
50–100 Hz	80% – 95%

• Natural frequency: 6–10 Hz (depending on stiffness and mass).

Ideal damping ratio for industrial machines and automotive components.
Reduces vibration transmission through chassis, floor, or frame structure.

Installation & Fitment Guidelines

Press-Fit Mounting:
- Interference fit of 0.1–0.2 mm between outer sleeve and housing bore.
- Use hydraulic or arbor press; avoid hammering to prevent bonding damage.
Axial Preload:
- Recommended pre-compression: 2–5% of rubber length for dynamic isolation.
Orientation:
- Align bush in neutral position before tightening bolts to prevent torsional preload.
Lubrication:
- Dry fit only. No lubrication between rubber and metal sleeves.
Inspection Interval:
- Every 12 months or 5000 operating hours for high-load applications.

Testing & Quality Assurance

RUBASIA conducts full in-house testing using advanced instrumentation:

Tensile & Elongation Test: ASTM D412
Compression Set Test: ASTM D395
Vibration Isolation Test: ISO 10846
Salt Spray Corrosion Test: ASTM B117 (500-hour rating)
Thermal Aging & Ozone Chamber Testing for tropical durability validation.

All products are manufactured under ISO 9001:2015 quality management and ISO/TS automotive standards compliance.

Environmental & Safety Compliance

RoHS Compliant (No lead, cadmium, mercury).
REACH Compliant (No restricted chemical content).
Halogen-Free Elastomer Formulations Available.
Recyclable metal sleeve and vulcanized rubber components.

Applications by Industry

Industry	Typical Usage
Automotive	Suspension arms, stabilizer links, torque rods, and anti-roll bars.
Construction Machinery	Vibratory roller mounts, loader linkages, excavator joints.
Industrial Equipment	Motor-pump couplings, blower mounts, compressor isolators.
Marine	Engine foundation isolators, gearbox mounts, deck machinery.
Power Generation	Generator and turbine vibration isolators.
Oil & Gas	Pump skid and compressor platform isolation mounts.

Service Coverage (Borneo Region)

Sabah: Kota Kinabalu, Sandakan, Tawau, Lahad Datu, Keningau, Kudat, Papar, Tenom, Ranau, Semporna, Beaufort, Kota Belud, Sipitang.
Sarawak: Kuching, Miri, Bintulu, Sibu, Kapit, Limbang, Betong, Mukah, Sri Aman, Serian, Bau, Marudi.
Brunei: Bandar Seri Begawan, Kuala Belait, Seria, Tutong, Gadong, Jerudong, Lumut.

Technical Advantages of RUBASIA Rubber Bush & Coupling Bush

High shear & torsional damping for dynamic vibration isolation
Enhanced fatigue life under cyclic load and thermal stress
Accurate stiffness control for frequency-tuned applications
Metal sleeve with anti-corrosion protection for long lifespan
No lubrication required, maintenance-free design
Customizable hardness, dimension, and bonding type
Tested to meet ISO, ASTM, and JIS standards

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