Rubber Compounding Materials
Vulcanization Materials
Activators


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Stearic acid F-2500
Vegetable based stearic acid
Harwick Standard
ï

Non-toxic off-white powder, faint odor; titre - minimum 50C, iodine number 10 maximum; acid number - 195 minimum.

Vegetable based grade of stearic acid used to activate rubber and latex, as a dispersing agent, lubricant, stabilizer, and processing aid


CR-30
Zinc oxide
Harwick Standard
ï

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

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


CR-420
Zinc oxide
Harwick Standard
ï

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

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


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.


PolyBound 463 Mag Oxide-70
70% magnesium oxide encapsulated in proprietary binder
Harwick Standard
ï

Sp. gr. 1.83; crumb

Polymer bound powder form of MgO easy to handle; dust free form incorporates rapidly during mixing.


Stan-Mag Products
Magnesium oxide
Harwick Standard
ï

A variety of of magnesium oxide based products in powder, bead, or bar form


Mastermix MgO H 2229 Slab-40
40% high activity magnesium oxide in an FKM binder.
Harwick Standard
ï

Sp. gr. 2.05

Dispersion of high activity magnesium oxide for use in general-purpose bisphenol cured FKM compounds.


Stan-Mag Bar
65% MgO in a proprietary binder
Harwick Standard
ï

Sp.gr. 1.80;bar form

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


Polyethylene Glycol EF/Enviropeg Line
Polyethylene glycol
Harwick Standard
ï

Line includes Solids - Sp gr 1.22; white powder or flake PEG-E-3350, E-4000, E-6000,E-8000 and E-20,000; Melt pt.55-61C Semi-solids - Sp.gr. 1.13; white E-1450, E-1500, and E-2000; melt point 44-48 C Liquids - Sp.gr. 1.13 E-200, E-300, E-400, E-600, & E-1000.

Activator used in conjunction with high surface area silicas and internal lubricant in elastomeric compounds.





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.


Mastermix Lime 2182 Paste-70
70% lime
Harwick Standard
ï

Sp. gr. 1.97

Dispersed form of Calcium Oxide for use in natural and synthetic rubbers.


Mastermix Calcium Oxide 6119 Paste-80
80% Calcium Oxide in a DIDP binder
Harwick Standard
ï

Sp. gr. 2.27

Dispersed form of Calcium Oxide for use in natural and synthetic rubbers.


CR-4G
Zinc oxide
Harwick Standard
ï

High purity French process, white granule/pellet sp.gr 5.6; medium particle size, medium surface

For natural and synthetic rubbers and latices as cure activator and/or vulcanizer; add directly to rubber; pellet grade provides less dust


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

Sp.gr. 2.24; paste

A premium paste dispersion for rapid mixing in rubber compounds; a cure activator; eliminates porosity due to moisture related blistering; used in low pressure or pressureless continuous curing of rubber extrusion products such as automotive weatherseals and pipe insulation.


Stearic Acid R Prill
stearic acid
HB Chemical
ï

Prilled rubber grade stearic acid.

Rubber activator, dispersing agent, lubricant, stabilizer, processing aid.


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.


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.


Starmag CX-150
Magnesium oxide
HB Chemical
ï

Surface area 135 m2/g; iodine absorption 145 mg/g; bulk density 0.35 g/ml; fine white powder

Excellent processing and dispersion; recommended for fluoroelastomer compounding; high activity; known for superior dispersability.


Starmag CX-50
Magnesium oxide
HB Chemical
ï

Surface area 42 m2/g; iodine absorption 50 mg/g; bulk density 0.51 g/ml, fine white powder; recommended for Viton, Fluorel; med. activity because of its superior dispersion.

Excellent processing and superior dispensability.





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