Our Services

Laboratory Services

Longman has excellent Rubber Testing Laboratory in which the following test can be performed:

  • Hardness
  • Tensile strength
  • Elongation
  • Heat ageing
  • Dynamic tests
  • Fatigue tests
  • Oil swelling and volume expansion test
  • Curometer test
  • Hose Burst test
  • Vacuum Collapse test and Chemical analysis of Rubber & Polymers.

Library Services

Longman has up–to-date literature collection on Rubber & Rubber Technology where variety of Books, paperbacks, spesifications, periodicals from foreign countries and technical guides can be consulted.

Computer Services

AN IBM compatible PC ll computer with variety of soft were are also installed to furnish the most modren techniques in the manufacturing of Rubber products and cost analysis.

Mould and Di Febrication Services

The factories have there own mould fabrication section where modern facilities has been provided to fabricate moulds,dies and jig to the required dimensions and specifications. This section have the following machines:

  • Milling Machine
  • Drilling Machine
  • Automatic Lathes of various size
  • Centering Machine
  • Grinding Machines

Compunding & Compund Design Section

This section has a team of experts in the field of Rubber Technolohy who can design a veriety of compund to suit you particular requirements various types pf Elastomers have been currently used within the factory for the particular application Most common of these are:

  • Neoprene
  • Nitrile
  • Silicone
  • Natural Rubber
  • SBR
  • Butyle
  • C-Butyle
  • B-Butyle
  • Viton
  • And Many Others.

Drawings and Development Services

This section helps to create the our products on a scientific manners All the products are classified in a systematic order inorder to maintain the records of the products along with there specific characteristics.




Frequently Asked Questions (FAQ's)

Who Discovered Rubber?

The Indians of central & south America were the first to utilize rubber’s unique properties. Christopher Columbus watched them play a game called “Tlachtlic” a vigorous cross between basketball and football, with the object of directing a rubber ball though a stone ring.

Who used it first & named “Rubber”?

In England,Joseph Prestley best know of his discovery of oxygen noted the pencil marks could be “rubbed out” by the substance from this early use, Rubber Derived its name.

What discovery marked the beginning of modern rubber technology?

Prior to 1839, the properties of rubber were dictated by the surrounding temperature, during the hot summer, rubber was sticky and malleable. While it became hard and brittle in the colder months that was finally remedied by the discovery of the process of vulcanization a mixture of rubber was dropped accidentally upon a hot stove. When it was removed, the material was on longer affected by temperature Despite of stretching, It always retumed to its original shape. This process of vulcanization made it possible to use rubber in tain coal. Overshoes and eventually, many other products including types.

Types of Rubber?

Tow types Rubber in common use today. These are Natural & Synthetic Rubber, Natural Rubber comes foram a tree Hevea brasiliensis.when tree natures at the ago of six or seven years, the latex (milk like material) is collected from a diagonal incision in the tree trunk. The tapping process dose not affect the health of the tree and tree wound later heals itself Synthetic rubber is mead by man from petrochemical feed Stocks, Crude oil is the principal raw material.

Where is Natural Rubber Produced?

Today more than 90% of natural rubber supply comes from south-East Asian country. A rubber tree require a hot,dampclimate, they grow only in the “ Rubber Belt “ an equatorial zone that stertches around the world. In 1876, the English recognition of the difficulties of securing quality rubber from the jungle hit upon the idea of growing rubber on plantations from their efforts,the cultivated rubber terr plantations of southest Asian and Africa have developed.

What accelerated the development of synthetic Rubber?

The united states & Germany were Cut of from virtually all of its sources of natural rubber in the pacific during world war ll . In order to meet the needs for this vital material, the Government built synthetic Rubber plants and the industry operated them.

How is synthetic Rubber produced?

General purpose synthetic rubber has its origin in two gases:BUTADUENE, a bye- product of petroleum refining, and styrene capture either in a cooking process or as a petroleum refining bye-product, when two are mixed in the persence of soapsuds in reator, liquid latex results. The dry rubber in this milky liquid is then coagulated into crumbs, washed dried and baled ready for shipment.

What are different types of synthetic Rubber?

Styene Butadiene rubber, poly- butadiene Rubber, butly Rubber, Nitrile Rubber, Chloroprene Rubber, Hypalon, EPDM, VAMAC silcones, flouroelastomers, Poly-urethanes.

What is the use of Rubber?

60% of the production is being used in Tyre manufacturing while 40% in used in nontyre applicatins i.e, Hoses belting automobile parts surgical goods, Glovers, industrial parts.

Production Flow Sheet of Rubber items.

  • ITEM SPECIFICATION & PARTY’S DEMAND
  • PREVIOUS RECORD
  • PRICE & QUOTATION
  • PRODUCTION PLANNING
  1. MOULD DESIGNING
  2. MOULD FABRICATION
  3. RIBBER COMPUNDING
  • RUBBER PRODUCTS PREPARATION
  1. EXTRUSION & TUBINGS
  2. SHEET METAL INSERTIONS
  3. CLOTH& YARNINSERTIONS
  4. RUBBER COMPOUND MIXING
  5. BLANK CUTTING
  • VULCANIZATION PROCESS
  1. OPEN STEAM CURING
  2. PRESS CURING
  3. HOT PATE HAND PRESSES
  4. OTHERS
  • FINISHING & TRIMMING
  • QUALITY CONTROL
  • PAKING & SHIPMENT

Laboratory Testing of Rubber Material Test Specifications:

  • BSS, ASTM, JIS, DIN, MILTARY & OTHERS
  • HARDNESS TESTING
  • ABRASION TESTING
  • TENSILE TESTING
  • ELONGATION TESTING
  • AGEING TESTING
  • VOLUME SWELLING TESTING
  • FATIGUE TESTING
  • CHEMICAL TESTING
  • COMPRESSION TESTING
  • PLASTIMETER TESTING
  • CUROMETER TESTING
  • OIL RESISTANT TEST
  • OZONE TEST

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