APPLICATION INFORMATION
ADDITIVES FOR CHEMICAL ANCHORING
AND FIXING PRODUCTS

TS-A 7

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Additives for chemical anchoring and fixing productsContents
03 Introduction
04 Additives for chemical anchoring and fixing products
05 Wetting and dispersing additives
06 Air release agents/defoamers
07 Surface-active additives
07 Rheology additives

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Introduction
Chemical anchors, also called chemical fixings, resin anchors, injectionmortars, or adhesive anchors, are names for systems used for fixing a bolt
or other anchorage in a substrate with the aid of a reactive polymer.
Various thermoset resin systems are used, which bond and polymerizewith the aid of a hardener after being placed in the substrate.
Originally developed for demanding professional applications such as mining
and tunneling, these systems are increasingly being used in the DIY market.
Special requirements are placed on mechanical properties, adhesive strength,durability, and chemical resistance. However, the stability of the usually highly
filled, still liquid resin mixture before curing is also extremely important.
This brochure summarizes our additive recommendation for this application.

For additional informationon additives and technical
topics please contact us:
Thermosets.BYK@altana.com

NoteTo ensure the best appearance
and full functionality, please
open in Adobe Acrobat.

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Additives for chemical anchoring and fixing products

Additives for chemical anchoring and fixing products
In chemical anchoring, generally highly filled, two-component
reaction resins are used to permanently bond anchors madeof metal or reinforced plastics to mineral materials (e.g.,concrete, masonry, and stone). The use of this techniquepermits stress-free, substance-to-substance bonding of ananchor to the material surrounding the drill hole.

2-packinjection
cartridge

The reaction resins are usually epoxides, unsaturated
polyesters, vinyl esters, acrylates, and modifications of these.
In practice, the reaction resins are either injected fromtwo-component cartridges or inserted as capsules into
the drill hole.
Important properties of the chemical anchors are: highmechanical resilience, excellent adhesion to the substrate,
good storage stability before the chemical reaction, andeasy processability with low raw material costs.

Chemicalresincapsule

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Additives for chemical anchoring and fixing products

Wetting and dispersing additives
Viscosity reduction (orthophthalicresin with 70 % quartz)

Stabilization against sedimentation
Without
additive

Viscosity (Pa·s)

Fillers are used to improve the mechanical properties of thesystem and to reduce costs. However, they increase theviscosity of the formulation and, in doing so, can makeprocessability more difficult. Suitable wetting and dispersing
additives improve the wetting of the solid particles, whichsignificantly reduces viscosity (G. 01). Alternatively, the filler
content can be increased while holding the viscosity
constant. Moreover, wetting and dispersing additives
stabilize the fillers against sedimentation (G. 02).

120

With wetting
and dispersing
additive

100806040200Control

1 % BYK-W 985

1 % DISPERBYK-2152
G. 01

Brookfield RVT, #7 spindle, 5 rpm

G. 02

Additive recommendations
SystemViscosity reduction

Stabilization against sedimentation

Epoxy

BYK-W 985
BYK-W 980
BYK-W 996
DISPERBYK-2152

ANTI-TERRA-204
BYK-W 940

Unsaturated polyester/vinylester(also monomer-free)

BYK-W 985
BYK-W 908
BYK-W 909*
BYK-W 966
DISPERBYK-2152

BYK-W 940

Acrylate

BYK-W 969
BYK-W 9010

BYK-P 105First recommendation  

Second recommendation   * Not available in EUT. 01

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Additives for chemical anchoring and fixing products

Air release agents/defoamers
Mechanical strength and chemical resistance are extremely
important for composite anchors. Air entrapment in the cured
system could negatively affect these properties. To achieve
optimal deaeration, resin-specific additives are added thatspontaneously deaerate the resin during preparation andimprove application.

Deaeration of an unsaturated polyester

Additive recommendations
SystemProductEpoxy

BYK-A 530
BYK-1790
BYK-A 501

Unsaturated polyester

BYK-A 555
BYK-A 515

Vinylester

BYK-A 515

Styrene-freepolyester/vinylester

BYK-A 530
BYK-A 555

Acrylate

BYK-A 515
BYK-070

First recommendation  

Second recommendation

Without additive

T. 02

With additive

G. 03

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Additives for chemical anchoring and fixing products

Surface-active additives
The often dusty surface of the mineral substrate makes
wetting and saturation of the substrate difficult, andthe consequence is that the resin and substrate are notsufficiently bonded together. The use of surface-activeadditives, which are generally based on modified
polysiloxanes, significantly reduces the surface tension ofthe resin (G. 04). The penetration of the resin into thesubstrate occurs more readily since the cohesion to thewall of the drilled hole becomes stronger than the adhesionof the liquid particles to each other.

Reduction of surface tension

Additive recommendations
SystemProductEpoxy

BYK-306
BYK-310

Unsaturated
polyester/vinylester(also monomer-free)

BYK-330
BYK-306
BYK-310

Acrylate

BYK-306
BYK-378

First recommendation  

Second recommendation

Without additive

With additive

T. 03

G. 04

Rheology additives
The flow behavior of the resin mixture is a critical factor forcomposite anchors. The system must be simple to prepare
and as stable as possible against sedimentation duringstorage. Good flow properties are required during
application so that all space between the anchor and thewall of the drilled hole is filled; on the other hand, the resinshould remain in the hole until it has cured and not leakout of the hole. To adjust the thixotropy of chemical fixingsystems BYK offers liquid as well as solid thixotropes.
The two thixotropy boosters must always be used incombination with a solid thixotrope such as GARAMITE
or fumed silica.

Additive recommendations
SystemThixotropy booster

Liquid thixotrope

Solid thixotrope

Epoxy

RHEOBYK-R 605
RHEOBYK-R 607*

RHEOBYK-410

GARAMITE-7305

Unsaturated polyester/vinylester(also monomer-free)

RHEOBYK-R 605

RHEOBYK-410**

GARAMITE-1958
GARAMITE-1210

Acrylate

RHEOBYK-R 605

RHEOBYK-410**

GARAMITE-1958
GARAMITE-1210

First recommendation  

Second recommendation   * For the hardener   ** Only for cobalt-free systems

T. 04

01/2022
TS-A 7BYK-Chemie GmbH
P.O. Box 10 02 4546462 Wesel
GermanyTel +49 281 670-0
Fax +49 281 65735

ADD-MAX®, ADD-VANCE®, ADJUST®, ADVITROL®, ANTI-TERRA®, AQUACER®, AQUAMAT®, AQUATIX®, BENTOLITE®, BYK®, BYK®-DYNWET®,
BYK®-MAX®, BYK®-SILCLEAN®, BYKANOL®, BYKETOL®, BYKJET®, BYKO2BLOCK®, BYKOPLAST®, BYKUMEN®, CARBOBYK®, CERACOL®, CERAFAK®,CERAFLOUR®, CERAMAT®, CERATIX®, CLAYTONE®, CLOISITE®, DISPERBYK®, DISPERPLAST®, FULACOLOR®, FULCAT®, GARAMITE®, GELWHITE®,
HORDAMER®, LACTIMON®, LAPONITE®, MINERAL COLLOID®, MINERPOL®, NANOBYK®, OPTIBENT®, OPTIFLO®, OPTIGEL®, POLYAD®, PRIEX®,
PURE THIX®, RECYCLOBLEND®, RECYCLOBYK®, RECYCLOSSORB®, RECYCLOSTAB®, RHEOBYK®, RHEOCIN®, RHEOTIX®, SCONA®, SILBYK®,TIXOGEL®, VISCOBYK® and Y 25® are registered trademarks of the BYK group.

info@byk.com
www.byk.com

The information herein is based on our present knowledge and experience. The information merely describes the properties of our products but noguarantee of properties in the legal sense shall be implied. We recommend testing our products as to their suitability for your envisaged purpose
prior to use. No warranties of any kind, either express or implied, including warranties of merchantability or fitness for a particular purpose, are maderegarding any products mentioned herein and data or information set forth, or that such products, data or information may be used without infringing
intellectual property rights of third parties. We reserve the right to make any changes according to technological progress or further developments.
This issue replaces all previous versions.