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Rubberised Cork Sheet

Pristine Technologies & Industries > Rubberised Cork Sheet
RUBBERISED CORK Sheet
RUBBERISED CORK Sheet
RUBBERISED CORK Sheet
Products

What is Rubberised Cork Sheet?

Rubberised Cork Sheet is one of the core sealing products manufactured using premium virgin rubber combined with high-quality cork granules for superior flexibility and resilience. Designed for flat flange gasketing applications, these sheets offer excellent compressibility, recovery, low side flow under compression and high resistance to transformer oil, liquids, gases, ageing and weathering.

 

Widely used in power and distribution transformers, Rubberised Cork Sheets ensure reliable leak-proof sealing performance under demanding operating conditions. Their excellent durability, easy fabrication and long service life make them an ideal solution for transformer and industrial sealing applications.

Key Features
Lowest lateral expansion

Excellent compressibility and recovery

High operating temperature range

High flexibility and durability

Property can be tailored as per application

Superior resistance to transformer oil

Property can be tailored as per application

Low side flow under compression

Material Specifications
Property Specification
Polymer Acrylonitrile-Butadiene Rubber (NBR)
Cork Grain Size 0.5 mm to 1.0 mm diameter
Standard Sizes 1000 mm × 1000 mm
900 mm × 600 mm
Thickness Range 2 mm to 25 mm
Tolerance Lateral Dimension: ±5 mm
Thickness: ±0.25 mm

Storage & Standards​​

Storage & Shelf Life

  • Storage Temperature: 27 ± 2°C
  • Humidity: 65 ± 5%
  • Shelf Life: 36 Months

Standards

  • IS 4253 (Part-2): 2008
  • ASTM F 104
Technical Specification​
Property Specification
Mechanical Properties
Hardness (IRHD) 70 ± 5
Tensile Strength (kPa) Min. 1550
Compressibility @ 2800 kPa (%) 25 - 35
Recovery (%) Min. 80
Compression Set @ 110 ±2°C for 24 Hrs (%) Max. 85
Flexibility @ 25 ± 2°C & 65 ± 5% RH There is no breakage through the granules of cork or separation of the granules
Flexibility at Low Temperature
Test at 25°C after conditioning at −40°C for 24 hours 		There shall be no breakage through the granules of cork or separation of the granules
Density (gm/cc) 0.85 – 0.95
Chemical Properties
Dimensional Changes:
- In Low Humidity (%)
- In High Humidity (%) 		Max. 1.5
Max. 1.5
Fluid Resistance Test:
Ageing in transformer oil @100°C for 72 Hrs
- In Volume (%) 		Max. 8.0
Chemical Test on Water Extract:
- pH Value
- Chloride Content as Chloride Ion (%)
- Sulphate Content as Sulphate Ion (%) 		5.0 - 8.5
Max. 0.2
Max. 0.2

Applications & Industries​​

Applications

  • Power Transformers
  • Distribution Transformers
  • Transformer Tank Gaskets
  • Industrial Flange Gaskets
  • Electrical Equipment
  • Oil Sealing Applications
  • Industrial Machinery

Industries

  • Automotive and transportation
  • Oil & gas refineries
  • Chemical processing plants
  • Power generation and transformers
  • Marine and shipbuilding
  • HVAC systems

Why Choose Pristine Technologies & Industries
for Rubberised Cork Sheets?​

01

Precision-engineered sealing solutions

02

Consistent and reliable product quality

03

Advanced manufacturing facility

04

Custom thickness options available worldwide

05

Reliable export-quality products

06

Industry-standard testing and compliance

Pristine Technologies & Industries

Need quality rubberized cork sheets? Get expert support, custom sizes and competitive prices today.

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