SKS-1739 / SBR-1739

Styrene-Butadiene Rubber

Specifications

Styrene-butadiene rubber SKS-1739 (SBR -1739) is the copolymer of styrene and butadiene manufactured by cold emulsion polymerization using mixed rosin acid/fatty acid soaps, filled with TDAE-type oil and staining antioxidant.

REACH: registered

Application: SKS-1739 (SBR-1739) is a special-purpose rubber, used in production of high speed automobile tires and heat-resistant conveyor belts.
Rubber should not contain any foreign impurities and must meet the following requirements:

Appearance: briquettes (bales)

Weight: 30.0+/-1.0 kg

Colour: from light-brown to dark-brown

 

The product must meet the following quality parameters:

Parameter

Standard

Test Method

Mooney viscosity ML 1+4 (100°C)*

50-60

ASTM D 1646 (para. 7.2.2)

Viscosity spread within a batch, units, max*

6

Volatile matter content, %, max (1 hour)*

0.75

ASTM D 5668 (method C)

Oil (TDAE) content, %*

25-29

ASTM D 5774

Bound styrene content, %*

38.5-41.5

ASTM D 5775

Ash content, %, max*

0.6

ASTM D 5667 (part A)

Organic acids content, %*

4.0-6.0

ASTM D 5774

Organic acids soaps content, %, max*

0.4

ASTM D 5774

Antioxidant content, %:

– VS-1* or

0.3-0.7

Method of supplier

– Agidol-2*

0.6-1.2

Method of supplier

Rheometric Properties

Standard

Test Method

МL, dNm**

2.1+/-1.0

ASTM D 5289

MH, dNm**

15.8+/-2.5

ASTM D 5289

ts1, min**

3.9+/-1.0

ASTM D 5289

t’50,min**

7.7+/-1.5

ASTM D 5289

t’90,min**

14.6+/-2.0

ASTM D 5289

* – specified in the certificate of quality.
** – non-rejectable.
Preparation of rubber mixes is carried out in accordance with ASTMD 3185 recipe 1А, mixing – according to method A. Mixing mills are prepared according to ASTM D 3182. Rheometric properties are determined according to ASTM D 5289 using an MDR 2000 rheometer (flow meter). Wait time for rubber mix before testing is 2-6 hours.

Rubber mix recipe and measurement conditions:

Rubber mix recipe in parts by weight:

Standard

Rubber

100.00

Zinc oxide

3.00

IRB 7 (N330) carbon black

50.00

Sulphur

1.75

Stearic acid

1.00

TBBS (N-tert-Butyl-2-benzothiazolesulfenamide)

1.00

Rheometer MDR 2000, measurement conditions:

Standard

Temperature, oС

160

Duration, min

30

Oscillation amplitude, deg.

+/-0.5

Oscillation frequency, Hz

1.7

Packaging:

Rubber briquettes (bales) are packaged in marked PE film (thickness of 0.05 +/- 0.01 mm, melting temperature of 108-112оС), then – in plastic box pallets of 450kg or in plywood containers of 1,080kg, or metal containers of 1,260kg.

Transportation:

Rubber is transported by all types of transport in covered transporting means in accordance to all rules of cargo’s transportation standing at transport of this form.

Storage:

At a temperature not exceeding 30оС, in dry place free from direct sunlight

Guaranteed Shelf Life:

1 (one) year from the manufacture date. After the expiration of the guaranteed shelf life, the rubber can be used for its intended purpose after confirmation of its conformity to the requirements of this product specification.