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                                                                           RETARDER RSF

DESCRIPTION:

A non-staining and non-discoloring retarder for natural and synthetic rubber compounds. Use from 0.50 to 1.3

parts per 100 phr, depending on polymer and accelerator system used. Very effective with sulfenamide

systems. Effective in thiazole systems as well as low sulfur/thiuram cures. Also useful for replasticizing of slightly

scorched stocks by cold mill mixing. Replaces Retarder SAFE in many applications at a lower cost. When

Retarder RSF is used in natural rubber, reversion is minimized.

Does not bloom at recommended amounts and no odor occurs from the use of Retarder RSF. Does not

significantly change the fully cured characteristics of the compound. State-of-cure is effected less than with most

other retarders.

TYPICAL PROPERTIES:

 Composition..........................................................Proprietary Blend

 Appearance...........................................................Cream to Tan Powder

 Odor .....................................................................Slight, typical

 Specific Gravity......................................................1.31

 Moisture................................................................0.5% maximum

 Melting Range........................................................77o

- 83o

C*

 Storage Stability.....................................................Stable

TOXICITY:

Not considered hazardous for normal industrial use. However, as with most rubber chemicals, avoid ingestion

and wash with soap and water after use.

* tentative range

t-retrsf

sb030702 Included with its product literature and upon the request of its customers, Akrochem provides product specifications and

evaluations, suggested formulations and recommendations and other technical assistance, both orally and in writing

(collectively the "Technical Information"). Although Akrochem believes all Technical Information to be true and correct, it

makes no warranty, either express or implied, as to the accuracy, completeness, or fitness of the Technical Information for

any intended use, or the results which may be obtained by any person using the Technical Information. Akrochem will not

be liable for any cost, loss or damage, in tort, contract or otherwise, arising from customer's use of Akrochem products or

Technical Information. It is the customer's sole responsibility to test the products and any Technical Information provided to

determine whether they are suitable for the customer's needs. Before working with any product, the customer must read

and become familiar with available information concerning its hazards, proper use, storage and handling, including all

health, safety, and hygiene precautions recommended by the manufacturer. Nothing in the Technical Information is

intended to be a recommendation to use any product, method, or process in violation of any intellectual property rights

governing such product, method, or process. No license is implied or granted by Akrochem as to any such product, method,

or process. AKROCHEM CORPORATION DISCLAIMS ANY AND ALL WARRANTIES, EXPRESS AND IMPLIED,

INCLUDING WITHOUT LIMITATION, WARRANTIES OF MERCHANTABILITY AND FITNESS FOR ANY PARTICULAR

PURPOSE, RELATED TO ANY PRODUCTS OR TECHNICAL INFORMATION PROVIDED BY AKROCHEM.RUBBER CHEMICALS

-RETARDERS-

 RETARDER RSF vs. RETARDER SAFE

Due to the escalating price of Retarder SAFE, an effort was made to find a reasonable substitute at a lower

cost. SAFE performs best in sulfenamide cures (CBTS, OBTS, BBTS). It is notable for the retention of the

state-of-cure of the compound due to an activating effect. SAFE also reduces reversion in natural rubber.

SAFE’s ability as a scorch retarder is moderate overall. We feel Retarder RSF is a good replacement for

Retarder SAFE in most cure systems. Here are a few test formulas and the results comparing Retarder SAFE

with Retarder RSF.

Sulfenamide Cure in SBR

SBR 1805 212.5 Rheometer @ 340°F RSF SAFE No Retarder

ZnO 5.0 T2 2.48 2.50 2.23

Stearic 1.0 T90 5.67 7.12 5.17

Sulfur 1.8 Max Torque 48.30 47.10 46.10

BBTS 1.5

TMTD 0.3 Scorch @ 270°F 15.95 15.79 11.11

Retarder 1.0

223.1

In SBR, SAFE tends to increase cure time (T90). This will also be seen again in a thiazole-cured SBR.

Scorch time and state-of-cure are comparable.

Included with its product literature and upon the request of its customers, Akrochem provides product specifications and

evaluations, suggested formulations and recommendations and other technical assistance, both orally and in writing

(collectively the "Technical Information"). Although Akrochem believes all Technical Information to be true and correct, it

makes no warranty, either express or implied, as to the accuracy, completeness, or fitness of the Technical Information for

any intended use, or the results which may be obtained by any person using the Technical Information. Akrochem will not

be liable for any cost, loss or damage, in tort, contract or otherwise, arising from customer's use of Akrochem products or

Technical Information. It is the customer's sole responsibility to test the products and any Technical Information provided to

determine whether they are suitable for the customer's needs. Before working with any product, the customer must read

and become familiar with available information concerning its hazards, proper use, storage and handling, including all

health, safety, and hygiene precautions recommended by the manufacturer. Nothing in the Technical Information is

intended to be a recommendation to use any product, method, or process in violation of any intellectual property rights

governing such product, method, or process. No license is implied or granted by Akrochem as to any such product, method,

or process. AKROCHEM CORPORATION DISCLAIMS ANY AND ALL WARRANTIES, EXPRESS AND IMPLIED,

INCLUDING WITHOUT LIMITATION, WARRANTIES OF MERCHANTABILITY AND FITNESS FOR ANY PARTICULAR

PURPOSE, RELATED TO ANY PRODUCTS OR TECHNICAL INFORMATION PROVIDED BY AKROCHEM.Sulfenamide Cure in Natural Rubber

Material PHR Rheometer @ 340°F RSF SAFE No Retarder

SMR CV60 70.00 T2 2.07 2.10 1.88

SBR 1500 30.00 T90 3.55 4.03 2.92

N550 90.00 Max Torque 65.80 62.80 60.30

Aromatic Oil 32.00

ZnO 5.00 Scorch @ 270°F 13.52 13.43 9.62

Stearic 1.50

Sulfur 1.80

CBTS 1.00

TMTD 0.40

Retarder 1.00

 231.70

Again, scorch is equivalent to SAFE. Cure time is a little faster. Reversion is reduced by both retarders. Higher

state-of-cure of the Retarder RSF resulted in a slight change in subsequent formulas to lower cured maximum

torque.

Included with its product literature and upon the request of its customers, Akrochem provides product specifications and

evaluations, suggested formulations and recommendations and other technical assistance, both orally and in writing

(collectively the "Technical Information"). Although Akrochem believes all Technical Information to be true and correct, it

makes no warranty, either express or implied, as to the accuracy, completeness, or fitness of the Technical Information for

any intended use, or the results which may be obtained by any person using the Technical Information. Akrochem will not

be liable for any cost, loss or damage, in tort, contract or otherwise, arising from customer's use of Akrochem products or

Technical Information. It is the customer's sole responsibility to test the products and any Technical Information provided to

determine whether they are suitable for the customer's needs. Before working with any product, the customer must read

and become familiar with available information concerning its hazards, proper use, storage and handling, including all

health, safety, and hygiene precautions recommended by the manufacturer. Nothing in the Technical Information is

intended to be a recommendation to use any product, method, or process in violation of any intellectual property rights

governing such product, method, or process. No license is implied or granted by Akrochem as to any such product, method,

or process. AKROCHEM CORPORATION DISCLAIMS ANY AND ALL WARRANTIES, EXPRESS AND IMPLIED,

INCLUDING WITHOUT LIMITATION, WARRANTIES OF MERCHANTABILITY AND FITNESS FOR ANY PARTICULAR

PURPOSE, RELATED TO ANY PRODUCTS OR TECHNICAL INFORMATION PROVIDED BY AKROCHEM.Thiazole Cure in SBR

Material PHR Rheometer @ 340°F RSF SAFE No Retarder

SBR 1805 212.50 T2 1.82 2.03 1.53

ZnO 5.00 T90 5.22 9.47 5.77

Stearic 0.90 Max. Torque 51.73 47.92 44.27

Sulfur 1.50

MBTS 1.50 Scorch @ 270°F 9.10 11.10 7.88

DPG 0.60

Retarder 1.00

223.00

Retarder RSF does not delay scorch as much as SAFE in this thiazole cure. However, most of the SAFE

retarding is related to the slowing of the overall cure rate. T90 is slowed significantly. This seems to be a function

of the SBR, since a thiazole-cured natural rubber showed minimal loss of T90. State-of-cure is raised slightly by

the new retarder. Again, the formula has been adjusted to reduce these differences in torque.

Included with its product literature and upon the request of its customers, Akrochem provides product specifications and

evaluations, suggested formulations and recommendations and other technical assistance, both orally and in writing

(collectively the "Technical Information"). Although Akrochem believes all Technical Information to be true and correct, it

makes no warranty, either express or implied, as to the accuracy, completeness, or fitness of the Technical Information for

any intended use, or the results which may be obtained by any person using the Technical Information. Akrochem will not

be liable for any cost, loss or damage, in tort, contract or otherwise, arising from customer's use of Akrochem products or

Technical Information. It is the customer's sole responsibility to test the products and any Technical Information provided to

determine whether they are suitable for the customer's needs. Before working with any product, the customer must read

and become familiar with available information concerning its hazards, proper use, storage and handling, including all

health, safety, and hygiene precautions recommended by the manufacturer. Nothing in the Technical Information is

intended to be a recommendation to use any product, method, or process in violation of any intellectual property rights

governing such product, method, or process. No license is implied or granted by Akrochem as to any such product, method,

or process. AKROCHEM CORPORATION DISCLAIMS ANY AND ALL WARRANTIES, EXPRESS AND IMPLIED,

INCLUDING WITHOUT LIMITATION, WARRANTIES OF MERCHANTABILITY AND FITNESS FOR ANY PARTICULAR

PURPOSE, RELATED TO ANY PRODUCTS OR TECHNICAL INFORMATION PROVIDED BY AKROCHEM.Low sulfur/high thiuram cure in NBR

Material PHR Rheometer @ 340°F RSF SAFE No Retarder

Krynac 34E35 100.00 T2 2.35 2.38 1.97

Q325 Whiting 40.00 T90 8.27 6.62 7.10

HC-75 Clay 20.00 Max Torque 60.14 73.40 62.62

ZnO 5.00

Stearic 0.50 Scorch @ 270°F 13.72 11.51 10.39

MC-98 Sulfur 0.50

TMTD 1.50

TETD 1.50

Retarder 1.00

170.00

SAFE has been known to have unusual effects in NBR. It does activate the cure and raises the state-of-cure

significantly. Retarder RSF has about the same state-of-cure as the control and retards better than SAFE.

Unfortunately the SAFE and RSF differ from one another in this type of cure system. They would each have

certain advantages and disadvantages here.

Retarder RSF may bloom if used in combination with Retarder CTP (PVI) due to similar (-imide) chemistry.

No bloom should occur if RSF is used alone at less than 1.3 phr.