ASTM & BS Framework

ASTM & BS Framework

A method for specifying rubber materials can be found in ASTM D2000 and BS 5176. These provide a full framework covering all rubbers and rubber properties. The relevant requirements for an application are selected from within the framework and are expressed in the form of a “line call out”. (The same framework is used in both ASTM D2000 and BS 5176).

An example of a line call out is BS 5176 1MBC514 F2 7Z1. This can be broken down as follows indicated in this table:

The appropriate table for Grade 1 MBC materials shows the following basic requirements:

  • Test: Elongation at Break
    Requirement: 400% minimum
  • Test: Heat Resistance (70 hrs @ 100°C)
    Requirement: T.S. ± 30%, E.B. -50% max, Hardness ±15° max
  • Test: Oil Resistance (Oil no.3 70 hrs @ 100°C)
    Requirement: Volume change + 120% max
  • Test: Compression Set (22 hrs @ 100°C)
    Requirement: 80% max

F27 is a low temperature modulus test to BS 903 A13. For Grade 1 MBC materials the requirement is for a modulus of 70MPa at -40°C (i.e. rubber is still flexible at -40°C).

Z1 indicates an additional special requirement. This would be shown on the drawing e.g. Z1 = red colour required.

The following specifications cover rubber materials for general applications:

  • BS 1154 Natural Rubber compounds
  • BS 2751 Nitrile Rubber compounds
  • BS 2752 Chloroprene (Neoprene) Rubber compounds
  • BS 3222 Low compression set Nitrile compounds

Member Testimonials

ONGC – Oil and Natural Gas Corporation Limited

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2014-06-08T07:48:57+00:00
“ONGC – Oil and Natural Gas Corporation Limited” – Our complex drilling application where Shaft was eccentric and application was robust & muddy. Replacement was never easy. Mech Spares designed Oil seals resolved difficulty. This gave a complete joy to my maintenance team.

Kuwait National Petroleum Company

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2014-06-08T07:49:23+00:00
“Mr Mohammed Al Duaigy” of (Kuwait National Petroleum Company) : We tried several diaphragms from renown worldwide Rubber manufacturing companies. We found Mech Spares technical know how and product to be of great durability and lasted 3 times more then anticipated. They have accurate understanding of there products.

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"McCafferty BM Design Ltd, KENT United Kingdom" - Most of the O rings manufacturing company suggested to use larger diameter and expensive elastomers. We learnt with Mech Spares that elastomer being weaker compare to metal and alloys and needs appropriate back up for high pressure or high vacuum applications. Further not necessary the most expensive elastomer is the best for all applications. We trust Mr Nilesh chodhari completely for all our O rings designing applications.
2014-06-08T07:50:26+00:00
“McCafferty BM Design Ltd, KENT United Kingdom” – Most of the O rings manufacturing company suggested to use larger diameter and expensive elastomers. We learnt with Mech Spares that elastomer being weaker compare to metal and alloys and needs appropriate back up for high pressure or high vacuum applications. Further not necessary the most expensive View Full →

Bhabha Atomic Research Centre ( BARC )

"Dr. A. Singh" of BARC: The electric Insulation mat manufactured by MECH SPARES as per IS 15624 tested at ERTL and found to withstand 40 Kv and still didn't tear. We have been using since 5 years and still didn't generate any fatigue. They arranged bulk delivery in short period.
2014-06-08T07:16:20+00:00
“Dr. A. Singh” of BARC: The electric Insulation mat manufactured by MECH SPARES as per IS 15624 tested at ERTL and found to withstand 40 Kv and still didn’t tear. We have been using since 5 years and still didn’t generate any fatigue. They arranged bulk delivery in short period.

Tata Steel

"Tata Steel" - One of our old machines started making loud noise and disturbed the entire village. We were compelled to stop the machines which lead to huge production loss. With the help of Mech Spares designed bellows in two part we could retain the lubrication and eliminate the noise.
2014-06-08T07:17:16+00:00
“Tata Steel” – One of our old machines started making loud noise and disturbed the entire village. We were compelled to stop the machines which lead to huge production loss. With the help of Mech Spares designed bellows in two part we could retain the lubrication and eliminate the noise.
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