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High performance toughening agent for thermosetting resins

Clearstrength® XT100 is a Methylmethacrylate-butadiene-styrene (MBS) core-shell additive powder designed as an easy-to-use, performance-enhancing toughener for structural adhesives and high performance composites.


  • Clearstrength® XT100 delivers exceptional toughening and mechanical property performance in thermoset systems.
  • The high dispersion efficiency of Clearstrength® XT100 means you can maximize toughener loading levels in the resin matrix and retain short dispersion times.
  • Clearstrength® XT100 does not significantly raise viscosity of the resin matrix compared to competing toughening technologies.

Product description

Clearstrength® XT100 is a Methylmethacrylate-butadiene-styrene (MBS) core-shell toughening agent designed to meet the most demanding technical requirements of thermoset applications including structural adhesives and high performance composites.

physical properties chart

Typical physical properties

Thanks to its unique and patented technology, Clearstrength® XT100 powder is easily dispersible in most liquid resin systems and exhibits a limited impact on the viscosity of the host resin system while providing an outstanding toughening effect in a wide range of service temperatures.


The images to the right depict the poor dispersion levels of standard MBS vs. the high dispersion levels of Clearstrength® XT100.


poor dispersion level

Poor dispersion level of standard
MBS into a high Tg epoxy cured

 Haut niveau de dispersion du Clearstrength® XT100

High dispersion level of
Clearstrength® XT100 into a high
Tg epoxy cured system

Product benefits

Easy dispersion

With this patented technology, Clearstrength® XT100 powder
can be easily dispersed into most liquid thermosetting resins
at very low shear rates.

The images to the right depict the strong agglomeration of
standard MBS vs. the easy dispersion of Clearstrength®
XT100 into MMA monomer.

standard mbs displays strong agglomeration into mma monomer

15 wt% of standard MBS into MMA
monomer, displays strong
→ strong agglomeration

Dispersion facile du Clearstrength® XT100 dans un monomère MMA

15 wt% of Clearstrength® XT100
into MMA monomer displays easy
→ easy dispersion

Dispersion spontanée du Clearstrength® XT100 dans le Methylmethacrylate

Figure 1


Clearstrength® XT100 can disperse spontaneously without shear into the liquid matrix.


The image to the right depicts Clearstrength® XT100 spontaneous dispersion into MMA monomer without shear.

Limited impact on host resin viscosity

 Faible impact sur la viscosité avec le Clearstrength® XT100

Figure 2


The introduction of any rubber-based toughener
into a liquid resin system is well-known to significantly
increase the viscosity of the host system. The viscosity
increase can be a significant problem for some
applications, such as composite materials made from
the infusion process. This effect is dramatically
reduced when using Clearstrength® XT100

Superior mechanical performance

The following graphs demonstrate the excellent balance of properties of Clearstrength® XT100 in a methacrylate structural adhesive formulation (Figure 3), as well as in a high Tg epoxy system (Table1). Because Clearstrength® XT100 is a non-reactive toughener, the final glass transition temperature of the host thermoset matrix is not affected.

Figure 3

 Clearstrength®XT100 dans un adhésif structural base Methacrylate

Table 1

clearstrength xt100 toughening effect on a high tg epoxy system

Suggestions for use

Clearstrength® XT100 is particularly recommended to increase the toughness of thermoset systems such as structural adhesives using methacrylate or epoxy host resin systems and composites. Recommended loading levels depend on final application and associated technical performance requirements. Customers should evaluate Clearstrength® XT100 toughening agent in their own laboratories to establish optimum conditions for use in their process and applications. Arkema’s Technical ServiceTeam is available to discuss your application requirements, provide formulation guidance and laboratory testing upon request.

Clearstrength® XT100 can be advantageously used to replace standard core/shell modifier powders and can also be used in liquid masterbatches of pre-dispersed core/shell particles.


Clearstrength® XT100 impact modifier is available in 18 kg bags (450 kg per pallet), and 450 kg bulk bags (450 kg per pallet).