Rubber Compounding Materials
Vulcanization Materials
Activators


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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.


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


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


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

Sp. gr. 1.94.

A convenient dispersed blend of activators for FKM compounds.


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 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.





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


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.


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


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


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 MBZ
Co-dispersion of Magnesia and Zinc
Harwick Standard
ï

Free flowing powder, 2.0 sp. gr., 65% active

Proprietary blend of zinc and magnesium oxides for polychloroprene vulcanization. Designed for use at 3 - 5 phr in polychloroprene to replace all magnesium and zinc oxide in a formulation.


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.


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.


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.


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.





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