Rubber Compounding Materials
Vulcanization Materials
Activators


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Starmag 150
Magnesium oxide
HB Chemical
ï

Surface area 135 m2/g; iodine absorption 155 mg./g; bulk density 0.35 g/ml; fine white powder

High activity for use with Neoprene and other chlorinated polymers; acts as an acid acceptor and high temperature aging improver.


Stan-Mag AG
Magnesium oxide
HEXPOL Compounding
ï

Sp.gr. 3.22; surface area- 140 m2g;powder

A high activity, high surface area magnesium oxide for stabilizing chlorinated polymers- CR,CSM,and CPE


Elastomag 100
Magnesium oxide
Akrochem Corp.
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 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.


Stan- Mag 112
Magnesium oxide
Harwick Standard Distribution Corporation
ï

Sp.gr 3.22;surface area- 35 m2/g;powder

Low activity,low surafce area magnesium oxide


Starmag U
Magnesium oxide
HB Chemical
ï

Surface area 145 m2/g; iodine absorption 160 mg/g; bulk density 0.43 g/ml; fine white powder

Highest activity for use in Neoprene G, W, TW types; acts as an acid acceptor in rubber and styrenic resins, CR contact adhesives; recommended for SMC thickener.


Ken-Mag
Magnesium oxide - bar form
Flow Polymers LLC
ï

Activator in bar form


Mag-Beads
Magnesium oxide beads
Rhein Chemie Corporation
ï

Sp.gr. 1.76; odorless, tan, free-flowing beads in high flash organic binder.

For CR, CSM, PE, NBR, polysulfides; activator, acid acceptor and vulcanizing agent; this dispersion in bead form resists hydration, handles easily and incorporates rapidly.


Akro-Mag Blue Label Bar
Magnesium oxide dispersion
Akrochem Corp.
ï

Sp.gr. 1.51; very fine dispersion; protected from loss of activity; cream color to dark tan. 3 lb bars, easy dispersing; good storage stability; all magnesium oxide is Elastomag 170 grade; highest activity type; superior protection.

Vulcanizer, activator, acid acceptor; used in polychloroprene, Hypalon; recommended at 4.0 parts/100 RHC.


Akro-Mag Green Label Bar
Magnesium oxide dispersion
Akrochem Corp.
ï

Sp.gr. 1.56; very fine dispersion; protected from loss of activity; cream color to dark tan 3lb. poly wrapped bars; easy dispersion; good storage stability; slightly less active magnesium oxide than Akro-Mag yellow bar.

Vulcanizer, activator, acid acceptor; used in polychloroprene, Hypalon; recommended at 4.0 parts/100 RHC.





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.


Scorchguard "O"
Magnesium oxide dispersion
Rhein Chemie Corporation
ï

Sp.gr. 1.90; buff-gray bars; very fine dispersion, protected from loss of activity

Used in chloroprene and chlorosulfanated polyethylene; gives superior protection against scorch, at process temperatures while giving excellent acceleration and vulcanization rates at cure temperatures; further aids processing by rapid incorporationand elimination of sticking to the mixer; retarder for halobutyls


Rhenofit 2060
Magnesium oxide in a binder
Rhein Chemie Corporation
ï

Sp.gr. 3.57; light gray powder

Curing activator and acid acceptor particularly suitable for polychloroprene rubber (CR) and adhesives. a low active magnesium oxide especially selected for the use in the rubber processing industry; improves the processing safety of rubber compounds based on CR, CSM, CM and CIIR; raises the critical temperature of basic accelerators and thus prevents scorching; for acid accelerators the activating temperature is decreased; in polymers containing chlorine, especially CR, it serves as an acidacceptor and thus improves the ageing properties of the vulcanizates; in cold cured rubber coated fabrics, it is used to neutralize acid traces; moduli are generally increased by the addition of Rhenofit 2060.


MgO, Sovsperse
Magnesium oxide, various active contents on proprietary binder
Flow Polymers LLC
ï

Pellets or slabs

Activator, acid receptor and stabilizer for CR, CSM, chlorinated IIR, chlorinated PE and fluoroelastomers.


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
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.


Stan-Mag Mini Beads
Medium light calcined, high activity magnesium oxide in a paraffinic oil binder system
Harwick Standard Distribution Corporation
ï

Sp.gr. 1.80; small bead form; 65% activity.

Pre-wet form which is non-dusty, free flowing and protected from the deleterious affects of humidity; use for rapid dispersion in halogenated polymers as an acid acceptor, scorch protector and curative.


Stan-Mag Mini Beads
Medium light calcined, high activity magnesium oxide in a paraffinic oil binder system
HEXPOL Compounding
ï

Sp.gr. 1.80; small bead form; 65% activity.

Pre-wet form which is non-dusty, free flowing and protected from the deleterious affects of humidity; use for rapid dispersion in halogenated polymers as an acid acceptor, scorch protector and curative.


Akrochem Stearic Acid-TP
Mixture of stearic and palmitic acids
Akrochem Corp.
ï

White flakes; sp.gr. 0.85; iodine <1; Gardner color <1.

High purity triple pressed (TP) stearic acid used in rubber compounding as an activator; excellent color, low iodine; plasticizer, process aid and internal/external lubricant.


Struktol Activator 73LM
Mixture of zinc salts of aliphatic and aromatic carboxylic acids
Struktol Company of America
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 Activator 73A
Mixture of zinc salts of aliphatic and aromatic carboxylic acids
Struktol Company of America
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.





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Suppliers listed
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HB Chemical

HEXPOL Compounding

Akrochem Corp.

H.M. Royal, Inc.

Harwick Standard Distribution Corporation

Flow Polymers LLC

Rhein Chemie Corporation

Struktol Company of America

     

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