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Struktol Rubber Processing Additives
Product Overview

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Activators
Multifunctional cure activators for the sulfur vulcanization of diene rubber, especially natural rubber. They can partly or totally replace conventional activators based on fatty acids (stearic acid, zinc stearate, and zinc 2-ethylhexanoate) and impart excellent reversion resistance. They can also be used as an effective physical peptizer for the mastication of natural rubber to improve processability in mixing, extrusion and molding. “LM” is designed for low shear and low temperature mixes.
As a rubber soluble zinc soap, it is used instead of stearic acid and reduces stress relaxation and primary creep of NR-vulcanizates, especially in combination with soluble EV-systems. ZEH-DL is a free flowing powder; it offers processing advantages compared to the high viscous liquid of ZEH.
A cross-linking agent consisting of a 2:3 ratio of zinc oxide to magnesium oxide for chloroprene compounds to reduce scorch.
Used as an activator for thiazoles, thiurams and dithicarbomates by supplying fatty acid and soluble zinc.
Amides
These unsaturated fatty primary amides function by migrating to the surface in a microscopic coating which reduces the coefficient of friction. TR 121 (oleamide) migrates more rapidly than TR 131 (erucamide) but has reduced heat stability. They function as both a lubricant and mold release agent and their low odor make it extremely suitable for food contact applications. *For peroxide cure systems, use TR 141.
Coated Metal Oxides
Coated zinc oxide with 91% ZnO for natural and synthetic rubber compounds, especially for CR. A non-dusting powder.
Coated magnesium oxide with 75% MgO for natural and synthetic rubber compounds, especially for CR and CSM. Provides protection against humidity and carbon dioxide.
Coated Sulfurs
These coated sulfurs contain dispersing and wetting agents that can be added to any natural rubber and synthetic rubber compound which is sulfur cured. They are active dispersions of oil treated sulfur at the following activity: SU 95A – 95% (soluble), SU 109A – 75% (insoluble), SU 120A – 83% (soluble), and SU 135A – 36% (insoluble).
Coupling Agents
They provide coupling of most non-black pigments to the polymer backbone allowing for: improved abrasion resistance, higher compound modulus, lower hysteresis, improved compression set, and improved rolling resistance in tire tread compounds and shoe sole compounds.
Fillers (non-black)
The numerous applications of Neuburg Siliceous Earth in elastomers include rubber articles for the automotive and construction, machinery and equipment industries, pharmaceutical rubber goods and compounds for the cable and general electrical industry. Aside from the Neuburg Siliceous Earth grades Sillitin and Sillikolloid, which mainly differ with respect to their particle size distribution, use also is often made of the surface treated Aktisil grades. Compared with untreated Neuburg Siliceous Earth grades, the Aktisil grades, in many applications, impart further improved processing characteristics as well as improves physical properties.
Homogenizing Agents
These homogenizing agents are particularly effective with those elastomer blends that tend to crumble at the beginning of the mixing cycle. They are used to improve the homogeneity of elastomers of different polarity and viscosity. They also reduce bagging tendencies; extrusion rates are increased without increasing the die swell, and calendaring properties are improved. Struktol homogenizing agents increase the green tack of many compounds although strictly they are not tackifiers. *For light colored compounds use STRUKTOL® 60 NS.
This is a high performance process additive developed for the rubber industry. Benefits have been shown in the tire industry, particularly where solution SBR and NR are being used. Processing benefits are seen without adverse effects on dynamic properties. This leads to potential application in other tire and non-tire applications (conveyor belts, motor mounts, hose, etc.).
This processing additive gives good tack and homogeneity in raw compounds. Due to the balanced combination of the tackifying resins and homogenizing agent, an optimum dispersion of the ingredients in the raw compound is achieved which maintains its green tack for several weeks under normal storage conditions.
Mandrel Release

Shows excellent release properties with Ethylene Propylene Diene Copolymers (EPDM Hose) in both Peroxide and Sulfur cured systems.  Has also shown excellent release properties of Ethylene Acrylate rubbers (VAMAC Hose). Additional Information

Mold Cleaner
A curable rubber compound for in situ cleaning of molds. Additional Information
Peptizers
These are used as a combination peptizing and processing additive which is effective in natural and synthetic rubber. A 80 and A 82 are easily dispersed in rubber due to their high content of dispersing agent. A 86 and A 95 contain more active substance and can therefore be used at lower levels.
A mixture of zinc soaps of high molecular weight fatty acids used to reduce viscosity in NR and SBR.
Plasticizers
An antistatic plasticizer for mineral filled NBR, SBR and NR compounds. A surface resistance as low as 1 x 106 Ohms can be achieved for NBR based vulcanizates.
An easily soluble plasticizer in aliphatic and aromatic hydrocarbons to improve the low temperature flexibility with all commonly used rubbers. NBR vulcanizates can be compounded with flexibility at temperatures as low as -55ºC.
Used in NBR, ECO, and ACM to improve oil and fuel resistance. Due to its incompatibility with aliphatic hydrocarbons, mineral oils and greases, it will not leach from vulcanizates, which minimizes hardening and shrinkage.
Polyethylene Waxes
A blend of low molecular weight polyethylene waxes that offers improved performance and/or processing of hot melt adhesives. It can improve bond strength, anti-blocking, softening point, viscosity modification and solvent and oil gelation.
A versatile polyethylene wax (homopolymer) used in natural and synthetic lastomers. It is used to improve flow and processability.
Processing and Dispersing Agents
A rubber soluble zinc soap of high molecular weight that leads to a faster physical peptizing of natural rubber. It starts to be effective in the lower temperature range of compounding and can be used for mastication in a separate stage as well as for single stage mixing.
A rubber soluble zinc soap leading to a faster physical peptization of natural rubber. It starts to be effective in the lower temperature range of compounding and can be used for mastication in a separate stage as well as for single stage mixing. A 60DH has a lower melting profile than A 60.
A peptizer in NR and has a limited effect on synthetic rubber (oil extended SBR and butyl rubber).  It can be used on a mill or on an internal mixer.  It causes splitting of the molecular chains which will reduce the molecular weight and make the rubber increasingly plastic.
A blend of fatty acid derivatives (predominantly zinc soaps) that is useful as a processing additive for applications in natural and synthetic rubber and provides excellent improvement of processing behavior for a wide range of elastomers such as NR, SBR, and EPDM (except for halogenated elastomers). Additional Information
A processing additive designed for use in EPDM, butyl, and halobutyl rubber compounds. It is a blend of rubber compatible non-hardening synthetic resins and fatty acid soaps, and is effective at improving extrusion uniformity and preventing surging while smoothing out the extrudate.
A product designed and selected to give maximum polymer to additive interactions. It is effective in increasing flow, promoting release, and effectively acts to improve overall processing. It contains no metal ions.
A processing additive for fluorinated rubbers. It is a blend of fatty acid derivatives and waxes and is a silicone free processing additive especially designed for fluoroelastomers and provides improved flow and easier demolding. Its good lubricating properties provide an increased extrusion rate and lead to an improved appearance rating.
This is the newest addition to our family of processing additives. It was designed for high performance silica loaded compounds. It is excellent for use in performance tires containing a wide range of elastomers NR, BR, SBR and S-SBR. It dramatically improves processing and extrusion (especially silica filled compounds) and stabilizes viscosity during extended storage times while giving your compound enhanced dynamic properties.
A complex oleochemical mixture containing mono and di amides and metal soap. It is a unique blend of anionic and ionic surfactants with lubricants, and is an effective dispersant, wetting agent and process agent in a variety of polymer systems.
For the production of compounds on open mills or in internal mixers, the addition of this product causes a better plasticity of elastomers which leads to a rapid incorporation of the fillers and other powdery ingredients. In highly filled compounds, it counteracts the formation of filler agglomerates. The dispersing effect supports the fine dispersion of all mixing ingredients so that lots with uniform properties will result.
A highly effective processing aid that is mainly used for special polymers. It contains a combination of zinc soaps and fatty acid ester tailor-made for use in epichlorohydrin rubber (ECO) to improve flow properties and release.
This mixture of fatty acid soaps, predominantly calcium, is used in rubber compounds to improve the flow properties attributable to a considerable reduction of the viscosity (internal friction) of the green compound. It improves mold release, especially when complicated mold designs are involved. It has a slight activating effect on the cure rate of sulfur-containing compounds.
A synergistic blend of fatty acid derivatives with selected polarities that provides internal as well as external lubrication in a wide range of elastomers, resulting in improved flow, cavity fill, and mold release.  It does not affect peroxide cure.
A blend of high-molecular weight, aliphatic, fatty acid esters and condensation products, bound to chemically inert fillers. A processing additive for polymers and is normally used to improve the general compound processing without significant influence on the physical properties. It acts as a dispersing agent for powdered materials and can shorten the mixing time by faster filler incorporation. The effect of the vulcanization behavior is neutral. It can reduce the risk of scorching particularly in highly loaded compounds. Due to the good plasticizing properties, molds can be filled faster with lower pressures during injection and transfer molding. The water content in WB 212 may cause a slight activation in compounds based on chlorosulfonated polyethylenes or equivalent polymers.
A condensation product of fatty acid derivatives and silicones. This product leads to best results in the processing of both special (e.g. ACM, ECO) and standard elastomers showing most advantageous effects, lowering viscosity, improving mill release and helping to solve mold release problems. It has an extremely low peroxide demand and has practically no effect on physical properties.
A processing additive based on organosilicones. These new organosilicones are highly compatible with rubber compounds. It has an extremely low volatility at high temperatures and is particularly suitable for FKM compounds and silicone compounds. It offers better extrusion properties and is excellent for injection molding. Additional Information
A proprietary zinc compound which helps in the processing of filled rubber systems. It offers heat stability (reversion resistance) and improves dynamic properties in natural rubber compounds containing mineral fillers and silane coupling agents. It can improve tack of high natural rubber compounds. Ultralube, Ultrablend, Ultraflow
Rubber Antitack
A mixture of insoluble and soluble soaps with dispersing agents. It is a batch-off slab lubricant designed for use in the rubber industry. The formulation is made without inorganic fillers.
Specialty Polymers
Lithenes are liquid hydrocarbon polymers of butadiene and are useful in a diverse range of applications such as rubber coagent for peroxide cured EPDM/EPR, automotive sealants, electrical potting and encapsulation, electro-deposition paints, co-curable plasticisers/process aids, adhesion promoter additives, modifiers for other
resin systems, chlorinated rubber feedstock, and sealants; e.g. ambient temperature cures. Dispergum deoflow deosol deotack homogenisator deolink deosulf deomag laurex
As a polymeric processing aid, it acts as a non-extractable plasticizer for rubber compounds. It is used as a processing aid in tires, profiles, tubes, a variety of molded rubber articles, roller coatings and calendered articles. This unique product becomes a liquid at high temperatures but returns to a solid at room temperature.
Tackifying Resins
This product can be used as a high performance tackifier for natural and synthetic elastomers for improving long term building tack in compounds and cements.
These products are resinous plasticizers which significantly increase the low green tack of synthetic rubber compounds. The “DL” forms are free-flowing powders that offer improved handling over high viscosity products. The TS 50 is especially suitable for EPDM compounds to improve the tack of “dry” highly loaded compounds.
A hydrocarbon resin that improves the homogeneity of elastomers of different polarity and viscosity. They are rapidly absorbed by the polymers during the mixing cycle. A relatively low viscosity mass is quickly achieved into which other compounding ingredients can easily be incorporated.
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