Rubber Compounding Materials
Vulcanization Materials
Activators


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Composition
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Properties

Function & Compounding


Mastermix MgO H 5901 Slab-40
40% high activity magnesium oxide in an FKM (genuine Viton) binder.
Harwick Standard
ï

Sp. gr. 2.07.

A pre-dispersed form of high activity magnesium oxide typically used as an acid acceptor in the curing of FKM compounds.


Stan-Mag 112
Magnesium oxide
Harwick Standard
ï

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

Low activity,low surafce area magnesium oxide


CR-3
Zinc oxide
Harwick Standard
ï

High purity French process , white powder, sp.gr 5.6;large particle size,low surface area ; also available with surface treatment CR-30

For natural and synthetic rubbers and latices as cure activator and/or vulcanizer; add directly to rubber


Zinc Stearate Line
Zinc stearate
Harwick Standard
ï

White powder or prill; Melt pt. 120C;available in high bulk or densified grades including USP and wettable

Mutiple functions in elastomeric compounds including lubricant,acid scavenger, viscosity modifier or cure activator.


CR-42
Zinc oxide
Harwick Standard
ï

High purity French process, white powder,sp.gr 5.6; small particle size and high surface area available with surface treatment (CR-420)

For natural and synthetic rubbers and latices as cure activator where high reactivity and high purity are required.


CR-4
Zinc oxide
Harwick Standard
ï

High purity French process ,white powder, sp.gr. 5.6; medium particle size and medium surface area; available with surface treatment (CR-40)

For natural and synthetic rubbers and latices as cure activator and/or vulcanizer; add directly to rubber.


Stan-Mag 1326 HR
A proprietary blend of zinc and magnesium oxides.
Harwick Standard
ï

Sp.gr. 3.17; powder

Component blend vulcanization system for CR polymers


Stan-Mag AG
Magnesium oxide
Harwick Standard
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


Stan-Mag MLW
Lightly calcined magnesium oxide
Harwick Standard
ï

Sp.gr. 3.22; surface area- 115m2/g; 98% passes 325 mesh

Medium-high activity and surface area grade used as an activator, acid acceptor and scorch protector for halogenated polymers CR, CSM and CPE


Stearic Acid F-2000
Stearic acid
Harwick Standard
ï

Non-toxic off-white powder, faint odor; titre - minimum 52C, iodine number 20 maximum; acid number - 195 minimum.

Rubber grade lower cost grade of stearic acid used to activate rubber and latex, as a dispersing agent, lubricant, stabilizer, and processing aid.





Stearic Acid F-1500
Stearic acid
Harwick Standard
ï

Non-toxic white powder; faint odor; titer, 58-62C; iodine number, 6 max.; acid number, 200-207; sap number 201-208.

Rubber activator; dispersing agent; lubricant; stabilizer; processing aid; latex activator.


Stearic Acid F-300
Stearic acid
Harwick Standard
ï

Stearic acid; non-toxic white powder; color (Lovibond), 1.5Y/0.2R; titer, 58-61C; iodine number 1 max.; acid number 200-206.

Rubber activator; dispersing agent; lubricant; stabilizer; processing aid; latex activator.


Natro-Cel TATM-A
72% Triallyl Trimelliate on silica powder
Harwick Standard
ï

Sp.gr. 1.15;Dustless powder

Excellent activator for cured EPDM and CPE.


Natro-Cel 35-A
72% trimethyl propane trimethacrylate on silica powder
Harwick Standard
ï

Sp.gr. 1.23; dustless powder

Co-agent for peroxide cured elastomers


Stan-Mag DS2
Magnesium oxide
Harwick Standard
ï

Sp.gr. 3.22;surface area- 165 m2g; powder

A high activity ,high surface area magnesium oxide for use as an acid acceptor in chlorinated polymers CR,CSM and CPE


Desical
80% calcium oxide in a naphthenic oil binder system
Harwick Standard
ï

Sp.gr. 2.10; liquid

Dispersion provides rapid incorporation into liquid systems, such as vinyl plastisols, and eliminates porosity due to moisture related blistering; used for pressureless and fusion processes for plastics.


PolyBound 498 Zinc Oxide
85% ZnO in a proprietary binder
Harwick Standard
ï

Sp.gr. 3.25; crumb

Polymer bound powder form of zinc oxide; dust free form; incorporates rapidly.


CR-4USP-2
Zinc oxide
Harwick Standard
ï

High purity, French process USP Grade sp.gr. 5.6

For natural and synthetic rubbers and latices as cure activator and/or vulcanizer; add directly to rubber


CR-40
Zinc oxide- treated
Harwick Standard
ï

High purity French process, white powder, sp.gr.5.6; medium particle size and medium surface area, surface treated with propionic acid

For natural and synthetic rubbers and latices as cure activator and/or vulcanizer; add directly to rubber; surface treatment provides easier, faster incorporation.


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





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