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RUBBER-KU RUBBER PRODUCTS

TECHNICAL MASTER SPECIFICATION & ENGINEERING DATA

Round External Rubber Cap (25mm | 28mm | 32mm | 38mm | 51mm)

RUBBER-KU RUBBER PRODUCTS is globally recognized as The Best round external rubber cap supplier in Malaysia and The Largest round external rubber cap Manufacturer Malaysia, delivering precision-engineered elastomer solutions backed by deep technical expertise. As The Highest Quality round external rubber cap manufacturer and Market Leader of round external rubber cap, we provide fully engineered products with strict adherence to mechanical, chemical, and dimensional performance standards.

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PART 1: TECHNICAL SPECIFICATION DATA SHEET

1.1 Physical & Mechanical Properties (Typical Values)

Property	Test Method	Unit	NR	EPDM	NBR
Hardness	ASTM D2240	Shore A	60 ±5	65 ±5	70 ±5
Tensile Strength	ASTM D412	MPa	18 – 25	12 – 18	10 – 20
Elongation at Break	ASTM D412	%	400 – 600	300 – 500	250 – 450
Tear Strength	ASTM D624	kN/m	High	Medium	Medium
Compression Set (22h @70°C)	ASTM D395	%	≤25	≤20	≤30
Abrasion Resistance	DIN 53516	mm³ loss	Low	Low	Low
Density	ASTM D297	g/cm³	1.05	1.20	1.25

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1.2 Thermal Performance

Material	Operating Temperature Range
Natural Rubber (NR)	-20°C to +70°C
EPDM	-40°C to +120°C
NBR	-30°C to +100°C

• Maintains elasticity under temperature fluctuations
• Resistant to thermal aging and degradation (EPDM preferred for extreme conditions)

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1.3 Chemical Resistance Matrix

Chemical Exposure	NR	EPDM	NBR
Water	Excellent	Excellent	Good
UV / Ozone	Poor	Excellent	Moderate
Oil / Grease	Poor	Poor	Excellent
Acids (Dilute)	Good	Excellent	Good
Alkalis	Moderate	Excellent	Moderate

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PART 2: DIMENSIONAL ENGINEERING & TOLERANCES

2.1 Standard Sizes

• 25mm
• 28mm
• 32mm
• 38mm
• 51mm

Full Production Range: 6mm – 51mm+ (custom sizes available)

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2.2 Dimensional Parameters

Parameter	Description
Inner Diameter (ID)	Designed slightly smaller than tube OD for interference fit
Outer Diameter (OD)	Defines overall cap coverage
Wall Thickness	Typically 2mm – 5mm depending on size
Base Thickness	Reinforced zone for load-bearing (3mm – 8mm)
Height	Customizable based on application

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2.3 Tolerance Control

• ID tolerance: ±0.2mm to ±0.5mm
• OD tolerance: ±0.3mm to ±0.8mm
• Thickness tolerance: ±0.2mm

Engineering Principle:
Elastic deformation ensures tight push-fit without adhesives.

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PART 3: INTERFERENCE FIT & RETENTION MECHANISM

3.1 Fitment Design

The cap uses a mechanical interference fit system:

• ID < Tube OD by 0.2mm – 0.8mm
• Elastic expansion during installation
• Recovery force creates radial pressure

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3.2 Retention Force Analysis

Retention depends on:

• Material elasticity (modulus)
• Surface friction coefficient
• Contact area

Optional Enhancements:

• Internal ribs for higher grip
• Textured inner surface

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PART 4: LOAD-BEARING & STRESS DISTRIBUTION

4.1 Compression Load Behavior

• Rubber base compresses under load
• Distributes weight evenly across contact area
• Reduces localized stress on flooring

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4.2 Static vs Dynamic Load

Load Type	Performance
Static Load	Maintains shape, low compression set
Dynamic Load	Absorbs shock and vibration

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4.3 Maximum Load Consideration

Dependent on:

• Cap diameter
• Base thickness
• Material hardness

Example:

• 25mm cap → light furniture
• 51mm cap → heavy-duty industrial load

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PART 5: FRICTION & ANTI-SLIP ENGINEERING

5.1 Coefficient of Friction

• High friction rubber compound
• Typical CoF range: 0.6 – 1.2 (surface dependent)

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5.2 Surface Interaction

Optimized for:

• Ceramic tiles
• Epoxy coatings
• Wood flooring
• Concrete surfaces

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PART 6: VIBRATION & ACOUSTIC DAMPING

6.1 Vibration Absorption

• Rubber converts kinetic energy into heat
• Reduces vibration transmission through structures

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6.2 Noise Reduction

• Dampens sound waves during movement
• Minimizes scraping and impact noise

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PART 7: MANUFACTURING PROCESS CONTROL

7.1 Compound Formulation

• Controlled mixing ratios
• Additives for:
  • UV resistance
  • Anti-aging
  • Flexibility enhancement

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7.2 Molding Technology

Compression Molding

• High density
• Suitable for thick caps

Injection Molding

• High precision
• Uniformity across batches

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7.3 Post-Processing

• Flash trimming
• Surface finishing
• Dimensional inspection

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PART 8: FAILURE MODE ANALYSIS

8.1 Potential Failure Types

Failure Mode	Cause	Prevention
Cracking	Low-quality material	Use high-grade elastomers
Slipping	Incorrect sizing	Proper ID tolerance
Deformation	Excess load	Reinforced base design
Hardening	UV/aging	Use EPDM material

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PART 9: PERFORMANCE OPTIMIZATION GUIDELINES

• Select correct material based on environment
• Ensure proper size matching with tube OD
• Use EPDM for outdoor applications
• Use NBR for oil exposure environments

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PART 10: CUSTOM ENGINEERING OPTIONS

RUBBER-KU offers:

• Custom Shore hardness (40 – 80 Shore A)
• Flame-retardant formulations
• Anti-static compounds
• Food-grade rubber options
• Multi-layer or hybrid material structures

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PART 11: COMPLIANCE & QUALITY STANDARDS

• ASTM D2000 (Rubber Material Classification)
• ISO 9001 Manufacturing Standards
• RoHS Compliance (on request)

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PART 12: INDUSTRIAL ADVANTAGE POSITIONING

RUBBER-KU remains:

• The Best round external rubber cap supplier in Malaysia
• The Largest round external rubber cap Manufacturer Malaysia
• The Highest Quality round external rubber cap manufacturer
• Market Leader of round external rubber cap
• Supplier of The Biggest round external rubber cap in Malaysia
• The Widest Range of round external rubber cap supplier

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FINAL TECHNICAL SUMMARY

RUBBER-KU’s Round External Rubber Cap is a precision-engineered elastomeric component designed for:

• Mechanical protection
• Load distribution
• Friction enhancement
• Environmental sealing

With superior material science, advanced manufacturing processes, and strict quality control, RUBBER-KU delivers unmatched technical performance across all applications.

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RUBBER-KU RUBBER PRODUCTS

TECHNICALLY ENGINEERED. INDUSTRY APPROVED. PERFORMANCE GUARANTEED.

chair leg rubber cap | rubber plug Malaysia | rubber cap supplier Malaysia | rubber cover cap Malaysia | anti slip rubber cap

Supplier	:	RUBBER-KU RUBBER PRODUCTS
Email	:	rubberku@gmail.com
Phone	:	+603 5191 7961
Fax	:	+603 5191 5961
Location	:	Selangor, Malaysia

Send us your enquiry if you have questions or comments about our products and services.