Struktol Company of America, LLC

Product Overview

Activator 73 A | Activator 73 LM

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 viscosity of ZEH.

Zimag 29/43A

A cross-linking agent consisting of a 2:3 ratio of zinc oxide to magnesium oxide for chloroprene compounds to reduce scorch.

Zinc Laurate

Used as an activator for thiazoles, thiurams and dithiocarbamates by supplying fatty acid and soluble zinc.

WB 700A

Coated zinc oxide with 91% ZnO for natural and synthetic rubber compounds.

WB 900A

Coated magnesium oxide with 75% MgO for natural and synthetic rubber compounds, especially for CR and CSM. Provides protection against humidity and carbon dioxide.

SU 95AF | SU 109A | SU 120A | SU 135A

These coated sulfurs contain dispersing and wetting agents and can be used to enhance sulfur dispersion in any natural or synthetic rubber compound. They are active dispersions of oil treated sulfur at the following activities: SU 95AF = 95% (soluble), SU 109A = 75% (insoluble), SU 120A = 83% (soluble), SU 135A = 75% (½ soluble and ½ insoluble).

40 MS

This homogenizing agent is particularly effective with those elastomer blends that tend to crumble at the beginning of the mixing cycle. It is used to improve the homogeneity of elastomers of different polarity and viscosity. It also reduces mill bagging behavior, extrusion rates are increased without increasing die swell, and calendering properties are improved. Increases the green tack of many compounds although it is not strictly a tackifier.

HP 55

A lubricant/homogenizer combination which improves the mixing behavior of rubber compounds and promotes dispersion of reinforcing materials such as carbon black. Benefits have been found in the tire industry, particularly where solution SBR and NR are used.

RP 17

May be added during compounding, extrusion or molding to eliminate or mask undesirable odors often associated with the addition of recycle streams or other ingredients used in compounding. At low dosages it tends to neutralize odor while at higher dosages it will impart a fresh “clean” odor to the rubber compound.

A 80 | A 82 | A 86

These are used as a combination peptizing and processing additive and are effective in both natural and synthetic rubber. A 80 and A 82 are easily dispersed in rubber due to their high concentration of dispersing agent. A 86 contains more active substance and can therefore be used at lower dosages.

A 91F

A mixture of zinc soaps of high molecular weight fatty acids used to reduce viscosity in NR and SBR.

HT 105A

A non-discoloring multifunctional additive used as a mild mastication additive. It combines both chemical and physical peptizing functionality. This additive favors the breakdown of high molecular weight chains alone, resulting in more uniform molecular weight distribution and better dynamic vulcanizate properties.

AW 1

An antistatic plasticizer for mineral filled NBR, SBR, and NR compounds. A surface resistance as low as 1 x 106 Ohms can be achieved in NBR vulcanizates.

KW 400

An easily soluble plasticizer used to improve the low temperature flexibility of all commonly used rubbers. NBR vulcanizates can be compounded to provide flexibility at temperatures as low as -55°C.

WB 300

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 and thus minimizes hardening and shrinkage.


A versatile polyethylene wax (homopolymer) used in natural and synthetic elastomers. It is used to improve flow and processability.

A 50

A rubber soluble zinc soap of high molecular weight that provides a rapid 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 60 | A 60DH

A rubber soluble zinc soap leading to rapid physical peptization. It starts to be effective at lower mixing temperatures 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.

Calcium Stearate

Used by the rubber and plastic industries as an effective elastomer processing aid and release agent.  The low chloride content of STRUKTOL® Calcium Stearate allows for complete product dispersion in elastomers.  Our "GR" version offers low dust and easy handling.

EF 44A

A blend of fatty acid derivatives (predominantly zinc soaps) useful as a processing additive for a wide variety of rubbers with the exception of halogenated elastomers. It is particularly effective in highly reinforced black and silica compounds and is especially suited for high durometer extrusion.

EP 52

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 smoothing extrudates.


Designed to provide improved processability, particularly for highly loaded silica compounds in either natural or synthetic polymers.

HPS 11

A zinc-free processing aid useful in both general and special purpose elastomers. It is designed to increase flow in filled compounds while promoting release to mixer rotors, mills, and calenders.

A zinc-free additive.

HT 204

Offers superior dispersion qualities and significantly improves both flow and release properties.

HT 207A

A zinc-free processing aid especially designed for use with silica-filled elastomers. It improves extrusion rate, reduces hysteresis, and reduces mill roll sticking. It has a slight activation effect in sulfur-cured compounds.

A zinc-free additive.

HT 254
  • Tailored process additive for high silica filled compounds
  • Reduces the tendency of re-agglomeration of filler particles
  • Maintains low viscosity during compound storage with good extrusion
  • Positive influence on cured viscoelastic dynamic properties
HT 257

Effective in highly loaded silica and silane systems. Offers big reduction in viscosity without influence on physical properties. For green tire compounds with high loadings of silica.

HT 290

A processing additive for fluorinated rubbers. It is silicone-free and provides improved flow and easier demolding. Its good lubricating properties provide an increased extrusion rate and lead to an improved appearance of the vulcanizate.

JV 46F

Designed to improve extrusion output and appearance in NR, SBR, SSBR, and EPDM compounds. Has a very high affinity for silica fillers and provides for maximum reduction of rolling resistance in high-performance silica tire treads.

Metal Stearates

Effective as processing aids, release agents, and /or as lubricants in the rubber and plastics industries.

RP 28

A nonstaining compatibilizing agent used primarily to blend dissimilar elastomers, including cured recycle. It improves mixing homogeneity and reduces filler incorporation time.

TR 251

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 and wetting agent in a variety of polymer systems.

W 34

A combination of zinc-free fatty acid derivatives. It is used as a filler dispersing agent in a wide range of polymers (NR, SBR, IIR, EPDM, CR, CSM, and ACM), and can be used in open mill production as well as production in internal mixers.

A zinc-free additive.

WA 48A

A highly effective processing aid mainly used for specialty polymers. It contains a combination of zinc soaps and fatty acid esters tailor-made for use in epichlorohydrin rubber (ECO) to improve flow properties and release.

WB 16

A zinc-free process aid designed to reduce viscosity and improve mold release in a wide variety of polymer systems; 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 zinc-free additive.

WB 42

A zinc-free blend of fatty acid derivatives that provides internal as well as external lubrication in a wide range of elastomers, resulting in improved flow, cavity fill, mold release and extrusion. It does not affect peroxide cures.

A zinc-free additive.

WB 212 | WB 222

A blend of high molecular weight, aliphatic fatty acid esters and condensation products. These processing aids are zinc-free and are designed to improve processing with no reduction in cured properties.

A zinc-free additive.

WS 180

A condensation product of fatty acid derivatives and silicones. This product leads to best results in the processing of specialty (e.g. ACM, ECO, FKM) elastomers. It has an extremely low peroxide demand and has practically no effect on physical properties.

WS 280

A processing additive based on organosilicones which are highly compatible with rubber compounds. It has extremely low volatility at high temperatures and is particularly suitable for FKM and silicone compounds. It offers better extrusion properties and is excellent for injection molding.

ZB 47

A proprietary zinc compound which promotes processing in 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 and tack retention of high natural rubber compounds.

ZB 49

A recent addition to our product lineup. It is designed for use as a process additive in silica-filled compounds to both reduce viscosity and improve extrusion rate. It promotes the crosslinking reaction between polysulfide silane coupling agents and polymer, and has minimal effect on dynamic stiffness.

Zinc Stearate

A high quality technical grade stearic acid manufactured in a tightly controlled production operation that guarantees product uniformity.  Available in bead, pastille or powder.

Silane Coupling Agents

These materials provide coupling of most non-black fillers to the polymer backbone allowing for: improved abrasion resistance, higher compound modulus, lower hysteresis, improved compression set, and in tire tread compounds improved rolling resistance. (See Silane Coupling Agents guide for details.)

SCA 98, 98CB, 98 PL, 98WT

Used in highly dynamic elastomer applications, including tires to improve reinforcing capabilities. These silanes will improve abrasion, lower hysteresis, improve adhesion and processing.

SCA 930 CB

A general rubber goods processing aid used to treat and couple the inorganic fillers in halogenated rubber so as to improve physical and mechanical properties

SCA 985, 985CB, 985PL

Used in highly dynamic elastomer applications, including tires to improve reinforcing capabilities. These silanes will improve abrasion, lower hysteresis, improve adhesion and processing.

SCA 989, 989WT

A coupling agent for rubber elastomers and polysulfide adhesives, as well as thermoplastic and thermoset resins.

SCA 1100

A versatile coupling agent for many thermoset and thermoplastic resins with glass and mineral fillers.


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 any inorganic fillers.

TR 121 | TR 131 | TR 141

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 them extremely suitable for food contact applications.  NOTE: For peroxide cure systems, use TR 141.

Koresin (BASF)

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.

Technical Information

Tires & Rubber Processing

TS 30DL | TS 35 | TS 35DL | TS 50FL

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. TS 50 is especially suitable for EPDM compounds to improve the tack of “dry” highly loaded compounds.

Strukrez 110

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.

*Zinc-Free Additives