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Synthetic rubbers

IIR BK-1675N

Commonly known as regular BUTYL RUBBER and now well known the world over by its Russian denomination. It competes successfully with its close analogues: Exxon 268 and Polysar 301.


UCP can supply Russian Isobutylene-Isoprene copolymers containing reactive Chlorine or Bromine as follows:
  • BBK 232 ( Equivalent of Bayer 2030 or Exxon 2211 / 2222 )
  • CBK 139 (Equivalent of Bayer 1240 or Exxon 1066 )
  • CBK 150 ( Equivalent of Bayer 1255 or Exxon 1068 )
Main Properties:
  • Low permeability to air, gases and moisture
  • Low glass transition temperature
  • Resistance to aging and to weathering from atmospheric exposure
  • Wide vulcanization versatility
  • Fast cure rates
  • No nitrosamine
Main applications:
  • Innertubes
  • Tire innerliners
  • Tire retreading
  • Hoses
  • Pharmaceuticals stoppers
  • Conveyor belt
  • Adhesives and sealants

IR high CIS (97 %) SKI-3 and SKI-3S (similar to NATSYN 2200)

World economy striving for costs effective products; these IRs known for high production costs has become quite rare on the market as it is almost abandoned by many producers. Russia still keeps on producing two major grades as per Russian denomination SKI-3 (staining) and SKI-3S (non-staining). Those replacements of NR add high abrasive resistance to rubber articles due to its high-CIS structure.

Polyisoprene SKI3 ( staining ) and SKI3S ( non-staining )

Our Polyisoprene ( similar to the Natsyn 2200 ) can replace the natural rubber in all its applications.
Hereunder are listed the main advantages of our Polyisoprene against the Natural Rubber :
  • Stable and regular supply over the year.
  • Can be blend easily with all types of Synthetic Rubber .
  • Equipment is used effectively ( less banbury runs ).
  • Abrasion Resistance very high due to High Cis 1-4 content ( 97 % min )
  • Preliminary Natural Rubber mastication is no more necessary.
  • Stable Characteristics throughout production lots, giving less recipe adjustments.
  • Polyisoprene SKI3 is approved and currently in use by the majors tyres manufacturers worldwide ( Pirelli, Michelin, Bridgestone, Goodyear and Continental )
  • Polyisoprene SKI3S is protein free and stabilized by non-staining BHT antioxydant hence suitable for medical and alimentary applications.

Lithium polybutadiene rubber

BR high CIS (90%) SKD-2 (Titanium catalyst)

BR high CIS (96%) SKD-K (Cobalt catalyst)

Polybutadiene BR high CIS (97%) SKD-K (Neodym catalyst):

This Synthetic solution Cis-butadiene rubber is a product of solution polymerization of butadiene using Neodymium compounds as catalyst:
The 1,4 cis-content in rubber is min. 97%. Polybutadiene Rubber is intended for use in tire, tire retrading, rubber-technical, golf balles, conveyor belt…
The BR SKD Nd has been homologated by the major tire manufacturers worldwide and can be compared to Petroflex Coperflex BR Nd or Karbochem Neodene grades.

SBR 1500,1502,1705,1712

SBR production unit is ISO 9002 certified. The audit N.686005 has been performed. It is a styrene-monomer SBR, producing no smell. It has been certified with the biggest tire manufacturers in the USA and Southeast Asia

Solution SBR ( S-SBR ) :

Solution SBR grades have superior mechanical properties, particularly tensile strength, low rolling resistance, and handling ( encompasses traction under a variety of conditions and performance at different speeds, when cornering etc), when used in tire applications. The ratio of butadiene configurations varies. Generally speaking, sSBR grades have a lower trans and vinyl and a higher cis butadiene content than eSBR grades.
Solution SBR (sSBR) is of particular importance because of the improved performance and flexibility of grade ranges. It is a preferred component, with silica filler, in so-called "green tires" which exhibit low rolling resistance and therefore improved fuel economy.
Our S-SBR material called DSSK-2545- 27 M is an oil extended grade similar to Negromex Solprene S-375, Petroflex Coperflex 4525-A and Karbochem Afpol 751.

Ethylene-propylene rubbers and elastomers (also called EPDM and EPM)

This polymer has unique features like very high molecular weight, highly extendible, good green strength for shape retention on extrusion. This rubber has recently been allowed for export due to conversion of military production into civil applications.

Main EPDM Properties :
Ethylene-propylene rubbers are valuable for their excellent resistance to heat, oxidation, ozone and weather aging due to their stable, saturated polymer backbone structure.
As non-polar elastomers, they have good electrical resistivity, as well as resistance to polar solvents, such as water, acids, alkalies, phosphate esters and many ketones and alcohols.

Main EPDM applications :
broad usage in automotive weather-stripping and seals, glass-run channel, radiator, garden and appliance hose, tubing, belts, electrical insulation, roofing membrane, rubber mechanical goods, plastic impact modification, thermoplastic vulcanisates and motor oil additive applications.

UCP can supply 5 differents EPDM Elastokam grades :

  • Elastokam 7505 :
    This High Mooney viscosity grade is particularly suitable for automobile profile applications ( equivalent of Exxon Vistalon 7500 or DSM Keltan 4802 )
  • Elastokam 6305 :
    This grade can be used for EPDM flooring , extrusion and moulding applications ( equivalent to DSM Keltan 67F ).
  • Elastokam 5408 and 6402 grades :
    Can be used in blend with our Butyl BK1675N to reinforce the service life of automobile tubes.
    Both grades are also suitable for Automotive and sponge applications ( equivalent of DSM Keltan 712 or Sumitomo Esprene 502 )
  • Elastokam 5402 :
    Can also be used in blend with our Butyl BK1675N to reinforce service life of automobile tubes. Used also for Automotive, cables and mechanical goods. ( equivalent of DSM Keltan 512 or Sumitomo Esprene 505 )

Generic EPDM grades EPDM 40, 50, and 60 are well suited for blending with the Butyl Rubber regular-iiR, whithout deteriorating the impermiability of the final compaund and improving its cured properties. One may blend up to 30 MPH of EPDM with 70 MPH of iiR, which may significantly reduce green compound production costs.

Related document: EPDM use in Butyl inner tubes.doc

It is useless to explain that conceived to be used, tested and proved to be reliable under rigorous military conditions, this rubber grade will be used at its best for roofing sheets, shock resistant parts and automotive joints. One of its best qualities is that it blends with butyl rubber for tubes.
ENB type (similar to Vistalon 6506, Keltan 55, KEP 435). This ENB based EPDM is a fast curing, high loading polymer. Look at our test comparison results, which place our EPDM among the winners.
DCDP type (similar to Royalene 400, Polysar 5465, Keltan520, Vistalon2200).


This is an oil resistant general-purpose butadiene-nitrile synthetic rubber, generally used in automotive parts, cable and roofing productions. Below are different grades available at UCP:
  • NBR-18S (similar to Nipol DN 404)
  • NBR -18SM (similar to Nipol DN 401, Perbunan 1807 NS)
  • NBR-26ASM (similar to Perbunan28012 NS)
  • NBR-33ASM (similar to Paracril, ISRN 233)
  • NBR-40ASM (similar to Perbunan 3807 NS, Nipol DN-108)


Polyisobutylene is a linear polymer of isobutylene of varying average molecular weights. This straight chain paraffinic hydrocarbon varies from a soft, tacky, viscous liquid to a tough elastomeric solid. Polyisobutylene is chemically inert and, therefore, possesses excellent resistance to oxidative and thermal degradation. It is used as a permanent flexibilizer and tackifier in pressure sensitive and hot melt adhesives. It is particularly useful where low temperature flexibility is a requirement.
Main applications :

  • Lubricant and fuel additives
  • Adhesives
  • Plasticizers for polyethylene and polystyrene
  • Sealants and caulks
  • Electrical insulation
  • Asphalt

Neoprene ( Choroprene )

 Neoprene rubber demonstrates a good balance of features, including such as resistance to ozone, oil and heat; flame retardancy, weatherability, special cohesiveness  and is very easy to process
Main applications :
Chloroprene rubber has many superior characteristics compared to natural and even other synthetic rubber types, so it has numerous applications :

  • molded : plumbing fixture; gaskets; hose; mechanical seal; mechanical belt; solid rocket propellant; balls; diaphragms as in diaphragm valve
  • extruded: garden hose; inner tube; laboratory tube
  • foam: wetsuit; diveskin; glove; balaclava; wetsock; mousepad; automotive seat covers; orthopaedic brace;Stubby holder; face mask
  • adhesive: adhesive tape; liquid adhesive 


(Thermoplastic Elastomer) is a solution polymerized block-type copolymer of styrene and butadiene. TPE can be processed by injection and extrusion differently from rubber. Therefore, it is applied to thermoplastics to improve resilience and shock strength. It can also be applied to an adhesive and a coating material.
Product Characteristics: Vulcanization process not necessary, recyclable, excellent tensile strength and resilience.


for all types of rubbers except for EPDM:
Packaged in briquettes covered with polyethylene film. Each Bale weights 30 Kg ( /- 1) equal to 66.138 Lbs ( /- 2.2046). The briquettes are placed in wooden pallet-boxes, 15 briquettes per box. Net Weight of rubber is each box is 450Kg (992.07 Lbs.). Gross Weight per pallet box is 510Kg (1,124.346). Each Marine 40 Ft. FCL contains 48 pallet-boxes totaling a net weight of rubber of 21.6 MT (47,619.36).
Dimensions: Briquette 650mm x 350mm x 175mm (25.50”x34.65”x31.50”)
Dimensions: Pallet Box – 1200mm x 880mm x 800mm (47.24”x34.65”x31.50”)
Pallet Boxes consist of wooden pallet with strong cardboard walls, reinforced with battens of the sides and in the center.

Epoxidized poliurethan sealant Specifically developed to weatherproof building joints.
UNISEAL sealant is a two-part epoxidized polyurethane terpolymer composition. It has been specifically developed and formulated for air and waterproof dynamically moving building joints.

  • No primer in most joints
  • Upon application forms a highly flexible rubber-like layer within the temperature range between -20 to 50 deg.C
  • Excellent adhesion to a wide variety of building materials
  • Withstands unusual movement without adhesive or cohesive failure
  • Readily tools to smooth attractive finish.
  • Typical Use: For sealing joints between precast concrete panels, tilt walls, expansion and control joints, curtain walls, perimeter joints of doors and sash, coping and fashing joints, horizontal joints of parking, plaza and promenade decks.

    Gun grade consistency. Easily workable, produces a smooth, attractive bead.
    Sizes: Packaged in bulk: 15 kg small "Euro" drums of sealant. Supplied in separate easy to open containers.
  • Also available in 50 kg drums
  • Meets Russian specification TY 38.403812-95
  • Meets US specification TT-S-00227E, class A, type II
  • Meets ASTM C920-79, type M, grade NS, class 25, use NT, M, A and O (granite)
  • Meets CGSB SPEC 19-GP-24
  • Other features:

    • Will not sag or weep in wide joints
    • Cures to a highly flexible, rubber-like bead
    • Tenacious adhesion to most building materials
    • Excellent recovery, 90% plus
    • Tools off flat and smooth, weathers beautifully
    • Greater stress relaxation than most other elastomer sealants
    • Non staining, even on sensitive masonry
    • Excellent resistance to ultra violet, ozone and moisture.
    • Performance properties are expected to be stable for at least 20 years
    • Outstanding low temperature performance (elasticity is retained at temperatures down to -50 deg.C)
    Inherent adhesion:

    UNISEAL is formulated from a 100% liquid polymer developed by the Institute of Research in the Field of Synthetic Rubber (VNIISK) in St. Petersburg, Russia. It is specifically designed for sealing building joints. Super adhesion and enduring elasticity are natural and inseparable characteristics of the basic polymer. These essential product features will not migrate or disappear with time as they do with many conventional sealants. The bases of such sealant usually need to be modified or have adhesion promoters added.

    Low modulus:
    In moving joints, low modulus sealant, which relax under stress (as opposed to high-modulus types, which do not) are more likely to prevent adhesive failure. They maintain sealant integrity (stay in one piece) as joints open and close. Although UNISEAL has 90% plus recovery, it still exhibits low modulus and less adhesion-breaking stress. It moves with, not against joint movement. UNISEAL withstands total movement up to 40% in extension and 25% in compression.

    Non sag:
    UNISEAL won't weep or sag even when joints end up wider than originally designed.
    Applications in joints up to 2 inch wide tool off flat and smooth without sagging.

    resists ultra violet, ozone and moisture. Offers 20year life expectancy.

    adheres without primer to most stainless steel, concrete, wood, brick, masonry, marble, granite, etc. Special instructions are available for remedial work.

    Initial set:
    16 to 24 hours at 24°C (75°F), 3 to 4 days at 4°C (40°F).

    Tack free time: 2 to 3 days at 24°C (75°F), 1 to 2 weeks at 4°C (40°F)

    Joint Design:
    • Size of joint should be four times of anticipated movement.
    • Minimum caulking joint, 0.6 cm (1/4 inch) by 0.6-cm (1/4-inch) depth of joint should not exceed width of joint from 0.6 cm (1/4 inch) to 1.3 cm (1/2 inch). For joints larger than 1.3 cm (1/2 inch) by 1.3 cm (1/2 inch) the depth of the joint should be more than 1.3 cm (1/2 inch) to 2.1 cm (5/8 inch)
    Movement should not exceed 25 % in either extension or compression from its installed shape.
    1,3 cm joint (1/2 nch) Withstands extension
    to 1,6 cm:
    Withstands compression
    to 1 cm:
    1,3 cm joint (1/2 inch) Withstands extension to 1,6 cm Withstands compression to 1 cm
    • A closed cell polyethylene joint backing should be used to control the depth of the joint sealant application.
    • Where joint depth does not permit use regular backing, a release paper shall be used. This permits the sealant to properly function by preventing its adhering to the back of the joint.
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