Rubber Compounding Materials
Vulcanization Materials
Activators


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Struktol WB 700A
Zinc oxide 91%; dispersing agent 9%
Struktol Company of America, LLC
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 Zimag 29/43A
Free-flowing granulate consisting of: 29% zinc oxide, 43% magnesium oxide and 28% wetting and dispersing agent.
Struktol Company of America, LLC
ï

Specific gravity: 2.11, bulk density: 800 (kg/m3), ash content: 70%, appearance: gray powder.

A cross-linking agent consisting of a 2:3 ratio of zinc oxide to magnesium oxide for chloroprene compounds to reduce scorch; dosage: 4-8 phr.


Struktol Activator 73A
Mixture of zinc salts of aliphatic and aromatic carboxylic acids
Struktol Company of America, LLC
ï

Dropping Point: 105-117C, Specific Gravity: 1.24, Zinc Content: 20% max, Appearance: antique white pastilles

Improvements include: prolonged reversion time, higher modulus, less heat build-up under dynamic load, and reduced compression set at elevated temperatures.


Struktol Activator 73LM
Mixture of zinc salts of aliphatic and aromatic carboxylic acids
Struktol Company of America, LLC
ï

Dropping point: 94-106C; specific gravity: 1.15; zinc content: 12% max; appearance: antique white pastilles

Effective activator for sulfur vulcanization, used at 2 - 5 phr, designed for lower temperature mixes compared to Activator 73A.


Struktol Zinc Stearate
Manufactured from a high quality technical grade stearic acid in a tightly controlled production operation that guarantees product uniformity.
Struktol Company of America, LLC
ï

Appearance: Three forms are available bead, pastille, and powder; zinc stearate bead is a free-flowing spray-dried microbead; the pastille is lens-shaped and approximately 1/8 inch in diameter; the bead and pastille are relatively new product forms in the industry; they have the major advantage of being essentially dust-free during handling, in contrast to powder forms; in all other aspects, the properties are equivalent to the standard stearates being used in the plastic and rubber industries.

Serves primarily as a lubricant, but also as a densifying agent and a partitioning agent; used extensively in color concentrates as a dispersion aid; used to improve processing of the styrenics and polyesters, and to a lesser extent with the olefins; In rubber applications, it functions as an elastomer processing aid and release agent.


Struktol WB 900A
Magnesium oxide dispersion
Struktol Company of America, LLC
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.


Struktol Zinc Laurate
Zinc salt of lauric acid
Struktol Company of America, LLC
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, LLC
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.


Zinc Oxide Dispersion - Taber brand
American and French zinc oxide and SBR
Taber Inc.
ï

A polymer masterbatch of 80% American or French zinc oxide and SBR.

Improve dispersion and processing.


Activator Dispersions - Taber brand
Various activators
Taber Inc.
ï

Paste, polymer masterbatches and netted powders of activators; compatibags, slabbed and/or pellitized masterbatches.

Consistent dispersion to improve processing.





Thanecure ZM
Zinc chloride dibenzothiazyl disulfide complex
TSE Industries Inc.
ï

Sp. gr. 1.80; yellowish powder

Activator for sulfur and peroxide cross-linkable polyurethane rubber.


Zinc Oxide Dispersion
60% zinc oxide dispersed in water
Vanderbilt Chemicals, LLC
ï

Density @ 25°C 1.98 Mg/m3; white dispersion; pH neat sample 9-11; total solids 2hrs @ 100-105°C 59.5-63.5%.

This dispersed form of zinc oxide permits its direct incorporation into latex compounds; Zinoxide at 0.5-6.0 phr is used to activate the cure of NR,SBR, and NBR latex compounds; zinc oxide acts as a vulcanizing agent in CR and XNBR latex; a minimum of 5 phr zinc oxide is generally used for the compounding of CR latexes.


Westco MO-140
Magnesium oxide
Western Reserve Chemical
ï

Fine white powder; surface area 45 m2/g.

Scorch retarder, curing agent and acid acceptor in polychloroprene and other chlorinated polymers.


Westco CAO-80
Calcium oxide disp.
Western Reserve Chemical
ï

Sp.gr. 2.1; a fine dispersion of CAO in a high viscosity processing oil.

Activator, desiccant, absorbs moisture and prevents porosity.


CR 4 USP
Zinc oxide
Western Reserve Chemical
ï

White powder; 99.9% passes through 325 mesh; sp. gr. 5.6; 99.9% zinc oxide; heavy metal content, carbonate content and alakalinity pass USP tests.

Activator; meets USP specifications.


CR 41
Zinc oxide
Western Reserve Chemical
ï

White powder; 99.9% passes through 325 mesh; sp. gr. 5.6; 99.9% zinc oxide; surface area 6 m2/g.

Fine particle size, fast curing.


CR 40
Zinc oxide
Western Reserve Chemical
ï

White powder; 99.9% passes through 325 mesh; sp. gr. 5.6; 99.9% zinc oxide; surface area 5 m2/g; surface treated with propionic acid.

Activator; surface treated to improve dispersion into rubber.


CR 4
ZnO
Western Reserve Chemical
ï

White powder; 99.9% passes 325 mesh; sp.gr. 5.6; surface area 5 m2/g; 99.9% ZnO min.

Activator for NR, SR, reinforcer and pigment.


Westco CAO-90
Calcium oxide dispersion
Western Reserve Chemical
ï

Sp.gr. 2.44; 86% min. calcium oxide in a high viscosity process oil

Activator; dessicant, absorbs moisture and prevents porosity in rubber.


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Suppliers listed
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Struktol Company of America, LLC

Taber Inc.

TSE Industries Inc.

Vanderbilt Chemicals, LLC

Western Reserve Chemical

     

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