Rubber Compounding Materials
Vulcanization Materials
Activators
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Tradename
Composition
Supplier
ò
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Properties
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Function
& Compounding
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Mastermix Lime 2182 Paste-70
70% lime
Harwick Standardï |
Sp. gr. 1.97
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Dispersed form of Calcium Oxide for use in natural and synthetic rubbers.
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Stan-Mag Bar
65% MgO in a proprietary binder
Harwick Standardï |
Sp.gr. 1.80;bar form
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Medium-high activity grade MgO used as an activator, acid acceptor and scorch protector for halogenated polymers such as CR and CSM
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Mastermix Calcium Oxide 6119 Paste-80
80% Calcium Oxide in a DIDP binder
Harwick Standardï |
Sp. gr. 2.27
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Dispersed form of Calcium Oxide for use in natural and synthetic rubbers.
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Stan-Mag Products
Magnesium oxide
Harwick Standardï |
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A variety of of magnesium oxide based products in powder, bead, or bar form
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CR-4G
Zinc oxide
Harwick Standardï |
High purity French process, white granule/pellet sp.gr 5.6; medium particle size, medium surface
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For natural and synthetic rubbers and latices as cure activator and/or vulcanizer; add directly to rubber; pellet grade provides less dust
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PolyBound 463 Mag Oxide-70
70% magnesium oxide encapsulated in proprietary binder
Harwick Standardï |
Sp. gr. 1.83; crumb
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Polymer bound powder form of MgO easy to handle; dust free form incorporates rapidly during mixing.
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Mixland + Zinc oxide Masterbatch
Zinc oxide -80 % active in a proprietary Mixland + binder
Harwick Standardï |
Pellets- 140 micron filtered
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Dispersion for easy incorporation;see also CR Zinc oxides
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PolyBound 466 Urea-75
75% urea encapsulated in proprietary binder
Harwick Standardï |
Sp. gr. 1.25; crumb
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Polymer bound powder form of urea; easy to handle form; dust free form incorporates rapidly during mixing.
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CR-420
Zinc oxide
Harwick Standardï |
High purity French process, white powder sp.gr 5.6; small particle size, high surface and surface treated with propionic acid
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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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CR-30
Zinc oxide
Harwick Standardï |
High purity French process , white powder, sp.gr 5.6;large particle size,low surface area and treated with propionic acid
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For natural and synthetic rubbers and latices as cure activator and/or vulcanizer; add directly to rubber; surface treated grade provides easier, faster incorporation.
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Polyethylene Glycol EF/Enviropeg Line
Polyethylene glycol
Harwick Standardï |
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.55-61°C
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.
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Activator used in conjunction with high surface area silicas and internal lubricant in elastomeric compounds.
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Stearic acid F-2500
Vegetable based stearic acid
Harwick Standardï |
Non-toxic off-white powder, faint odor; titre - minimum 50°C, iodine number 10 maximum; acid number - 195 minimum.
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Vegetable based grade of stearic acid used to activate rubber and latex, as a dispersing agent, lubricant, stabilizer, and processing aid
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Stan-Mag MBZ
Co-dispersion of Magnesia and Zinc
Harwick Standardï |
Free flowing powder, 2.0 sp. gr., 65% active
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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.
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Desical P
80% calcium oxide in a naphthenic oil binder system
Harwick Standardï |
Sp.gr. 2.24; paste
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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.
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Mastermix MgO H 2229 Slab-40
40% high activity magnesium oxide in an FKM binder.
Harwick Standardï |
Sp. gr. 2.05
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Dispersion of high activity magnesium oxide for use in general-purpose bisphenol cured FKM compounds.
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Starmag CX-50
Magnesium oxide
HB Chemicalï |
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.
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Excellent processing and superior dispensability.
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Fluorocal H; Fluorocal O
Calcium hydroxide; calcium oxide
HB Chemicalï |
Tightly controlled particle size distribution for calcium hydroxide H-20, H-30; uniform, consistent particle size calcium oxide O-15.
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Intended for FKM compounds where superior dispersion and consistency is required; several grades and packages available; allows single pass FKM mixing.
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Stearic Acid R Prill
stearic acid
HB Chemicalï |
Prilled rubber grade stearic acid.
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Rubber activator, dispersing agent, lubricant, stabilizer, processing aid.
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Starmag U
Magnesium oxide
HB Chemicalï |
Surface area 145 m2/g; iodine absorption 160 mg/g; bulk density 0.43 g/ml; fine white powder
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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.
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Starmag 150
Magnesium oxide
HB Chemicalï |
Surface area 135 m2/g; iodine absorption 155 mg./g; bulk density 0.35 g/ml; fine white powder
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High activity for use with Neoprene and other chlorinated polymers; acts as an acid acceptor and high temperature aging improver.
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