Rubber Compounding Materials
Vulcanization Materials
Activators


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Struktol Zinc Laurate
Zinc salt of lauric acid
Struktol Company of America
ï

Specific gravity: 1.08; drop point: 125-135C; appearance: white pastille or course powder

Used as an activator for thiazoles, thiurams and dithicarbomates by supplying fatty acid and soluble zinc; dosage: 1-5 phr; Call for FDA status.


Struktol ZEH
Zinc 2-ethylhexanoate
Struktol Company of America
ï

Specific gravity: 1.20, zinc content: 24% max, viscosity at 25C (mPa-s): 7000 max, appearance: high viscosity liquid

A rubber soluble zinc soap used as an activator for natural rubber; used instead of stearic acid and reduces stress relaxation and primary creep of NR-vulcanizates, especially in combination with soluble EV-systems; dosage: 1-3 phr.


Struktol WB 700A
Zinc oxide 91%; dispersing agent 9%
Struktol Company of America
ï

Specific gravity: 3.85; bulk density: 1,200; ash content: 91%; appearance: non-dusting powder

A non-dusting powder and is preferably used, where high amounts of dispersing agents are undesirable; shorter mixing time can be achieved compared to powered zinc oxide due to faster incorporation and the temperature of the compound is increased only slightly, which is an advantage in scorchy stocks; can be used in small dosages due to the uniform dispersion of the zinc oxide; formation of agglomerates, variations of the physical values and brittleness of the vulcanized rubber are reduced; physical properties of the vulcanizates are improved, especially after aging.


Struktol WB 900A
Magnesium oxide dispersion
Struktol Company of America
ï

Specific gravity: 2.09, magnesium oxide: 75+/-1, appearance: tan bead

Struktol metal oxide preparations may be used in rubber compounds where the dispersion of untreated metal oxides gives rise to problems; they reduce sticking to the rotor blades and mill rolls; WB 900A provides protection against humidity and carbon dioxide.; reduces the scorch risk of polychloroprene compounds.


Urea, WUF-16
Urea
Sovereign Chemical Company
ï

Coated or oil treated powder

Activator for nitrogen type blowing agents; product is hygroscopic and relatively non-dusting.


ZnO, Sovsperse ZnO-85
Zinc oxide 85% active dispersed in an elastomeric binder
Sovereign Chemical Company
ï

Sp.gr. 3.10; small granules

Activator in sulfur based cure systems and a vulcanizer for halobutyl rubbers


SA-590
Rubber grade, vegetable based stearic acid
Sovereign Chemical Company
ï

Flake, sp. gr. 0.84

Vegetable based grade of stearic acid designed for use in rubber compounding as an activator; also used in esters for various lubricant applications as metal working and textile lubricants, and in the production soaps, emulsifiers, and metallic stearates.


Stearic acid, SA 590
Vegetable based stearic acid, rubber grade
Sovereign Chemical Company
ï

Flake, sp.gr. 0.84

see SA-590


Elastomag 100
Magnesium oxide
H.M. Royal, Inc.
ï

White powders. sp. gr, 3.2, surface area 100m2/gm, avg, sp gr, 2.5; shipped in 50# multiwall bags and PE pouches; protect from air and moisture.

For halogenated elastomers; vulcanizing and curing; activator, acid acceptor.


Elastomag 60
Magnesium oxide
H.M. Royal, Inc.
ï

White powder; sp. gr, 3.2; surface area 60m2/gr; shipped in 50# multiwall bags; protect from air and moisture.

For halogenated elastomers; vulcanizing and curing; activator, acid acceptor.





Stearic Acid
Stearic acid
H.M. Royal, Inc.
ï

Sp.gr. 0.84; white powder, flakes, slabs; mild fat odor; non-toxic; mp, 126-133°F; iodine No, 0-15; mp and Iodine number both depend on purity (whether single, double or triple-pressed).

For NR, SRs, (except IIR), latexes; activator; plasticizer; softener; gives acid-type activation; improves processing; aids filler and pigment dispersion; add directly.


Plastomag 170
Elastomag 170 (magnesium oxide) and naphthenic oil
H.M. Royal, Inc.
ï

Sp.gr. 2.45; bead form; oil agglomerated ultrafine particles.

For halogenated elastomers; vulcanizing and curing agent; activator; acid acceptor; pelleted product improves handling conditions.


Poly-Dispersion JZFD-90P
88% zinc oxide in a NR binder
Rhein Chemie Corporation
ï

Sp.gr. 3.50; white pellets

Vulcanizing activator for use in natural and synthetic rubber compounds.


Rhenofit CF
Specially treated very fine Ca(OH)2
Rhein Chemie Corporation
ï

Sp.gr. approx. 2.2 white powder

Crosslinking activator for fluoro-elastomers.


Rhenofit 1987
Combination of activating substances based on urea
Rhein Chemie Corporation
ï

Sp.gr. approx. 1.5; white powder.

Curing activator and promoter for reinforcing fillers


Rhenofit 1600
Combination of urea derivatives and dispersing agent
Rhein Chemie Corporation
ï

Sp.gr. approx. 1.25; light-colored aqueous paste

Blow promoter and deodorizer as well as vulcanization activator with built-in scorch retarder.


Elast-O-Cal 80HT
80% CaO paste dispersion in paraffinic oil binder
Rhein Chemie Corporation
ï

Sp.gr. 2.25; firm paste dispersion in a 580°F flash point binder (see calcium oxide)

Similar to Elast-O-Cal 80 in function except the 580°F binder allows higher temperature curing operations without oil volatilization.


Poly-Dispersion T(HRL)D-90
Fine particle size litharge in an EPDM binder
Rhein Chemie Corporation
ï

Sp.gr. 4.75; litharge 90%; very fine dispersion in elastomeric slab form, scored, dusted, and separated with PE.

chlorosulfonated polyethylene stabilizer, add in first step in mixing cycle; provides processing and handling safety, excellent dispersion, uniform cures.


Elast-O-Cal P-90
90% CaO in DOP
Rhein Chemie Corporation
ï

Sp.gr. 2.70; wetted powder in DOP carrier (see calcium oxide)

An efficient moisture absorber for all commonly used elastomers imparting excellent protection against porosity or blistering in rubber products produced in low-pressure, high-temperature cure systems such as microwave units, LCM, hot air cures or fluidize baths.


Elast-O-Cal 90
90% calcium oxide in oil binder
Rhein Chemie Corporation
ï

Sp.gr. 2.73; off-white wetted powder

An efficient moisture absorber for all commonly used elastomers imparting excellent protection against porosity or blistering in rubber products produced in low-pressure, high-temperature cure systems such as microwave units, LCM, hot air cures or fluidized bed units.





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Struktol Company of America

Sovereign Chemical Company

H.M. Royal, Inc.

Rhein Chemie Corporation

     

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