Rubber Compounding Materials
Vulcanization Materials
Activators


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Function & Compounding


Mastermix Zinc Oxide 5350 Pellet-85
85% Zinc Oxide in an EPDM binder
HEXPOL Compounding
ï

Sp. gr. 3.10

Dispersed form of medium surface area zinc oxide for use in natural and synthetic rubbers.


DLP 1049 SR-517-75A
75% SR-517 on a carrier
HEXPOL Compounding
ï

Dry Liquid Powder - free flowing version of the SR-517 liquid. Easier to handle, weigh and incorporate into NR and SR compounds.


Desical P
80% calcium oxide in a naphthenic oil binder system
HEXPOL Compounding
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.


Mastermix Zinc Oxide 5118 Slab-90
90% Zinc Oxide in an EPR binder
HEXPOL Compounding
ï

Sp. gr. 3.75

Dispersed form of a high surface area zinc oxide for use in natural and synthetic rubbers.


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 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.


Stearic Acid R Prill
stearic acid
HB Chemical
ï

Prilled rubber grade stearic acid.

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


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.


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.


Fluorocal H; Fluorocal O
Calcium hydroxide; calcium oxide
HB Chemical
ï

Tightly controlled particle size distribution for calcium hydroxide H-20, H-30; uniform, consistent particle size calcium oxide O-15.

Intended for FKM compounds where superior dispersion and consistency is required; several grades and packages available; allows single pass FKM mixing.





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

Sp. gr. 1.83; crumb

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


Zinc Stearate Line
Zinc stearate
Harwick Standard Distribution Corporation
ï

Sp. gr- 1.09; white powder; 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.


Stearic Acid F-1000
Stearic acid
Harwick Standard Distribution Corporation
ï

Stearic acid, 70-75%; non-toxic white powder; color (Lovibond), 10.0Y/15R; 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.


PolyBound 466 Urea-75
75% urea encapsulated in proprietary binder
Harwick Standard Distribution Corporation
ï

Sp. gr. 1.25; crumb

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


Mastermix CalMag 5903 Slab-45
45% active 2:1 blend of calcium hydroxide and magnesium oxide in an FKM (genuine Viton) binder.
Harwick Standard Distribution Corporation
ï

Sp. gr. 1.94.

A convenient dispersed blend of activators for FKM compounds.


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


CR-40
Zinc oxide- treated
Harwick Standard Distribution Corporation
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.


CR-4G
Zinc oxide
Harwick Standard Distribution Corporation
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


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

Sp. gr. 2.05

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


CR-420
Zinc oxide
Harwick Standard Distribution Corporation
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





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