Rubber Compounding Materials
Vulcanization Materials
Activators


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Properties

Function & Compounding


Laurex
Zinc salts of lauric and related fatty acids
Chemtura
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Sp.gr. 1.18; tan flaked solid; mp about 107-118°C, but not definitely specified; good storage stability.

For CR, NBR, NR, SBR and their latices; recommended for tire carcass and tread compounds, extruded stocks, proof goods; activates thiazole accelerators and their derivatives; evens out and advances curing rates of off-grade rubbers deficient in natural fatty acids. Low blooming from cured and uncured compounds; much less blooming than many other fatty acid softeners; non-discoloring; melts, disperses readily.


BIK-OT
Surface-coated urea
Chemtura
ï

Sp.gr. 1.31; fine, white powder; mp, 129-134°C; good storage stability under normal conditions; somewhat hydroscopic.

For CR, IIR, NBR, NR, SBR and EPDM; activator for nitrogen-type blowing agents; activator for thiazole, thiuram and dithiocarbamate accelerators; relatively nondiscoloring and non-staining; reduces odor-producing properties of dinitrosopentamethylene tetramine blowing agents; helps lower decomposition point of Celogen AZ and Kempore types to range normal for rubber curing.


Actafoam R3
Fatty acid salts dispersion
Chemtura
ï

Sp.gr. 1.05; amber liquid; lead free; for use in FDA approved applications.

Activator-stabilizer for foamable thermoplastic compounds; replacement for a portion of the normal zinc oxide level in sponge rubber compounding.


Stearic Acid - Industrene
Stearic acid
R.E. Carroll Inc.
ï

White powder or flakes.

Single, double, triple pressed.


Pristerene 9429
Stearic acid.
M.F. Cachat
ï

Tallow based rubber grade stearic acid; titre, 52-60°C, iodine no. 11 max., acid value 192-210 and saponification value 194-212.


Magnesium Oxide

Brenntag Specialties, Inc.
ï

Magnesium oxide


Zinox 350
Zinc oxide
American Chemet
ï

Sp.gr. 4.9 g/cc; high surface area ZnO > 21m2/gm; precipitated; nodular; ± 99.5% -325 mesh; cream-off white.

Activator for rubber; neoprene, butyl, nitrile, EPDM, SBR, latex, etc.


TEA DLD
Triethanolamine (99%) on silica binder.
Akron Dispersions, Inc.
ï

Sp.gr. 1.414; light gray to tan, dustless, free-flowing powder.

Activator for NR and SBR; neutralizes acidity of clay.


TATM DLD
Triallyl trimellitate on silica binder.
Akron Dispersions, Inc.
ï

Sp.gr. 1.415; off white, dustless, free-flowing powder.

Activator for peroxide vulcanization.


Bostex 422
Aqueous dispersion of zinc oxide
Akron Dispersions, Inc.
ï

Off white liquid; total solids 59.5-63.5%; pH - 9.0-11.0.

A 60% aqueous dispersion of a conventional activator for accelerator systems used in natural and synthetic latices.





Akroform Pb3O4-90/EPR/P
Red Lead in EPR
Akrochem Corp.
ï

90% active.

Easy and safer handling; used primarily as ECO acid acceptor.


Akroform PbOMC-90/EPR/P
Calcined litharge in EPR
Akrochem Corp.
ï

90% active MB in pellets form.

NR and SR cure activator/acid acceptor in EPR.


Akro-Mag Green Label Bar
Magnesium oxide dispersion
Akrochem Corp.
ï

Sp.gr. 1.56; very fine dispersion; protected from loss of activity; cream color to dark tan 3lb. poly wrapped bars; easy dispersion; good storage stability; slightly less active magnesium oxide than Akro-Mag yellow bar.

Vulcanizer, activator, acid acceptor; used in polychloroprene, Hypalon; recommended at 4.0 parts/100 RHC.


Akro-Mag Blue Label Bar
Magnesium oxide dispersion
Akrochem Corp.
ï

Sp.gr. 1.51; very fine dispersion; protected from loss of activity; cream color to dark tan. 3 lb bars, easy dispersing; good storage stability; all magnesium oxide is Elastomag 170 grade; highest activity type; superior protection.

Vulcanizer, activator, acid acceptor; used in polychloroprene, Hypalon; recommended at 4.0 parts/100 RHC.


Akrochem Stearic Acid-Rubber Grade (RG)
Stearic acid
Akrochem Corp.
ï

Titer 52-64°C; iodine value 10 max.; acid no. 193-213; saponification no. 193-214; Gardner color 10 max.

Dispersing agent and accelerator activator in rubber compounds.


Akro-Zinc Bar 85
Zinc oxide dispersion
Akrochem Corp.
ï

Sp.gr. 3.60, zinc oxide 85%; 6 lb. bar; 54 lb carton.

Use in place of zinc oxide powder on a part for part basis; use for applications where a pre-wetted product is desirable; G type Neoprenes where addition of zinc oxide late in mix is indicated; low hardness compounds where zinc oxide dispersion is amust.


Akrochem Untreated Zinc Oxides
Zinc oxide
Akrochem Corp.
ï

Sp.gr. 5.6; primary zinc oxide; odorless, non-toxic, fine white powder.

NR, SR, latex activator, reinforcer, good inorganic color; add directly to rubber, as water dispersion to latex.


Akrochem Treated Zinc Oxides
Zinc oxide surface treated with proprionic acid
Akrochem Corp.
ï

Sp.gr. 5.6; primary zinc oxide; odorless, non-toxic, fine white powder.

NR, SR activator reinforcer, good inorganic color; add directly to rubber, easy dispersing.


Akrochem PEG 3350
Polyethylene glycol
Akrochem Corp.
ï

Powder/Granules; sp.gr. 1.15; melt point 130°F; soluble in water

As an activator for silica/mineral filled compounds; aso as a process aid/lubricant; typical dosages 1.5 to 3.0 phr; higher levels are used to add polarity to mircrowave-cured EPDMs.


Akrochem Zinc Oxide 35
Precipitated zinc oxide
Akrochem Corp.
ï

White to light yellow powder; sp.gr. 5.6; surface are 35 m2/gram.

Effective activator of extremely fine particle size; use in NR, SR and latex applications; high activity permits 20-30% reduction in loading compared to regular zinc oxide; useful in transparent and translucent rubber articles; crosslinking agent for CR and XNBR.





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Suppliers listed
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Chemtura

R.E. Carroll Inc.

M.F. Cachat

Brenntag Specialties, Inc.

American Chemet

Akron Dispersions, Inc.

Akrochem Corp.

     

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