TEGOSTAB B 8523

Tegostab B 8523 is used alongside other surfactants in manufacturing rigid foams for construction, automotive, insulation, and industrial applications.
Tegostab B 8523 remains stable in blends that include flame retardants, fillers, pigments, catalysts, and auxiliary surfactants.

CAS Number: 13324-20-4
EC Number (EINECS): 236-363-9
IUPAC Name: 1-amino-4-[3-[(4,6-dichloro-1,3,5-triazin-2-yl)amino]-4-sulfoanilino]-9,10-dioxoanthracene-2-sulfonic acid
Molecular Formula: C23H14Cl2N6O8S2
Molecular Weight: ~637.4 g/mol

SYNONYMS:
TEGOSTAB B 8523, Tegostab B 8523, TEGOSTAB B, Reactive Blue 4, 13324-20-4, Procion blue MX-R, C.I. Reactive Blue 4, NSC364368, 1-amino-4-[3-[(4,6-dichloro-1,3,5-triazin-2-yl)amino]-4-sulfoanilino]-9,10-dioxoanthrene-2-sulfonic acid

Tegostab B 8523 is an additive developed for use in rigid foam systems which are formulated for maximum open cell content.
In these types of formulations Tegostab B 8523 effectively supports cell opening.
Tegostab B 8523 is a cell opener for rigid polyurethane foam systems which must be used together with a silicone stabilizer, preferably Tegostab B 8871.

This combination of additives allows to adjust the open cell content of the obtained foam to the requirements of a given application by simply changing the ratio of the two components.
The cell opening efficiency of Tegostab B 8523 strongly depends on the formulation parameters and the foam processing conditions.

Therefore the optimal use level as well as the ratio of Tegostab B 8523 and Tegostab B 8871 should be identified in an initial screening to avoid the formation of a coarser cell structure and to achieve the desired degree of cell opening.
Tegostab B 8523 is an additive / surfactant designed primarily as a foam stabilizer and cell opener in rigid polyurethane foam systems.

Tegostab B 8523 is a non-hydrolyzable polyether-polydimethylsiloxane copolymer (a silicone-based surfactant) developed to support controlled cell morphology in foam formulations, especially where an open cell structure is desired.
Tegostab B 8523 is designed to play a structural control role rather than acting only as a simple foam stabilizer.

In polyurethane chemistry, Tegostab B 8523's primary contribution is the regulation of interfacial tension between reacting polyol–isocyanate phases and the evolving gas phase generated by chemical or physical blowing agents.
This allows the foam to expand in a controlled manner while preventing premature cell collapse or irregular void formation.

One of the distinctive features of Tegostab B 8523 is its cell-opening capability.
Unlike strong cell-closure silicone surfactants, this grade promotes partial rupture of cell walls at the correct stage of foam rise.
This behavior is especially valuable in rigid foam systems where gas diffusion, pressure equalization, and dimensional stability are critical.

As a result, foams formulated with Tegostab B 8523 often show reduced internal stress and lower risk of post-expansion shrinkage.
Another important characteristic is Tegostab B 8523's contribution to emulsification efficiency.
In formulations using hydrocarbons (such as pentane) or other hydrophobic blowing agents, Tegostab B 8523 helps maintain a fine dispersion of the blowing agent within the polyol phase prior to reaction.

This leads to more homogeneous nucleation and a more predictable foam rise profile.
From a durability standpoint, Tegostab B 8523 is considered chemically stable and non-hydrolyzable under typical polyurethane processing and service conditions.

This stability helps ensure that foam properties such as mechanical strength, thermal insulation performance, and dimensional stability remain consistent over time.
Regarding safety and handling, Tegostab B 8523 is generally treated as a low-volatility industrial additive.

Tegostab B 8523 does not significantly contribute to workplace VOC emissions under normal use.
Standard industrial hygiene practices are recommended, including avoidance of prolonged skin contact and protection against accidental splashes.
While it is not intended for direct consumer exposure, Tegostab B 8523 is commonly used in industrial environments where controlled handling procedures are already in place.

In terms of regulatory and market positioning, Tegostab B 8523 is classified as a specialty performance additive rather than a commodity chemical.
This means Tegostab B 8523 is typically supplied with detailed technical data sheets and formulation guidance from suppliers.
Regulatory compliance, such as REACH status, is usually addressed at the supplier level, making Tegostab B 8523 suitable for use in regulated markets including the EU.

Overall, Tegostab B 8523 is best described as a functional foam morphology modifier rather than just a stabilizer.
Tegostab B 8523's value lies in its ability to fine-tune foam structure, improve processing robustness, and support consistent product quality in demanding rigid polyurethane foam applications.

USES and APPLICATIONS of TEGOSTAB B 8523:
Application of Tegostab B 8523: Rigid polyurethane foams with an open cell structure are important materials for some industries, such as the construction (gap filling) or the automotive industry.
Here the typical insulation properties of rigid polyurethane foam are not required.

The structural support and the energy absorbing nature of the foam is much more important.
It is therefore quite common to use water as a chemical blowing agent.
In most low density foam grades an open cell structure is essential to achieve a sufficient dimensional stability.

Tegostab B 8523 is used alongside other surfactants in manufacturing rigid foams for construction, automotive, insulation, and industrial applications.
Tegostab B 8523 is only a weak stabilizer therefore it has to be used in combination with silicone surfactants, e. g. Tegostab B 8871.

In particular, Tegostab B 8523 is the cell opener of choice for systems that are used to manufacture water blown, thermo-formable rigid foams as they are required to make automotive headliners.
However, since the performance of Tegostab B 8523 largely depends on the nature of the formulations it might be considered for other systems that are designed for open cell rigid foams as well.

From a formulation perspective, Tegostab B 8523 shows good compatibility with both polyether and polyester polyols, including systems containing recycled polyols or natural oil-based polyols.
Tegostab B 8523 remains stable in blends that include flame retardants, fillers, pigments, catalysts, and auxiliary surfactants.

This makes Tegostab B 8523 suitable for modern formulations where multiple performance targets must be met simultaneously.
In processing terms, Tegostab B 8523 provides a wide processing latitude.
Tegostab B 8523 tolerates variations in temperature, mixing intensity, and blowing agent concentration better than highly active silicone surfactants.

This is particularly beneficial in continuous production lines or large-scale molding operations, where minor fluctuations in processing conditions are unavoidable.
Foams produced using Tegostab B 8523 often exhibit uniform cell size distribution and improved surface appearance.

This can translate into better adhesion to facings, coatings, or substrates, which is important in sandwich panels, laminated insulation boards, and composite assemblies.
Improved surface quality can also reduce post-processing steps such as trimming or sanding.

FUNCTIONAL USES AND APPLICATIONS of TEGOSTAB B 8523:
-Primary Application:
Foam Stabilization & Cell Opening in Rigid PU Foams.
Tegostab B 8523 is used in rigid polyurethane foam systems, especially in water-blown systems and those formulated for maximum open cell content.
Tegostab B 8523 helps control cell structure, improves emulsification of blowing agents (e.g., pentane), and supports consistent foam expansion and surface quality.

-Industries & End Uses of Tegostab B 8523:
Construction materials: 
Gap fillers, insulation boards, structural foam components.
Automotive industry: 
Components like headliners and rigid foam molded parts where open-cell foams are needed.
Polyurethane manufacturing: 
Suitable for both polyester and polyether polyol systems.

PERFORMANCE FEATURES of TEGOSTAB B 8523:
Tegostab B 8523 supports controlled cell opening when used with silicone stabilizers.
Tegostab B 8523 enhances emulsification of non-polar blowing agents within polyol mixtures.
Tegostab B 8523 contributes to fine cell structure, broad processing latitude, and consistent foam morphology.
Tegostab B 8523 is compatible with flame-retardant systems and can support formulations with natural oil-based polyols (NOPs).

BENEFITS & CHARACTERISTICS of TEGOSTAB B 8523:
*Formulation Advantages
Polyether-siloxane copolymer structure gives balanced surface activity and stabilizing efficacy.
Medium activity grade that can be tailored with co-surfactants.
Tegostab B 8523 supports consistent foam quality and improved nucleation.

*Processing Benefits
Low VOC profile helps meet product emissions criteria.
Good chemical stability in polyol blends, even with other additives present.
Improved emulsification of blowing agents, enhancing uniformity.

RECOMMENDED STORAGE CONDITIONS of TEGOSTAB B 8523:
Tegostab B 8523 has a solidification point below 0 °C.
The viscosity increase at low temperatures is reversible and has no negative influence on the efficiency of Tegostab B 8523.
For Tegostab B 8523 we guarantee a shelf life of at least 12 months upon – provided it is kept in originally sealed drums and protected against extreme weather conditions, particularly against heat and water.

PHYSICAL and CHEMICAL PROPERTIES of TEGOSTAB B 8523:
Viscosity (25 °C):150 – 550 mPas
Density (20 °C):1.015 – 1.025 g/ml
Product Name:TEGOSTAB B 8523
CAS Number:13324-20-4
EC Number (EINECS):236-363-9
IUPAC Name:1-amino-4-[3-[(4,6-dichloro-1,3,5-triazin-2-yl)amino]-4-sulfoanilino]-9,10-dioxoanthracene-2-sulfonic acid
Molecular Formula:C23H14Cl2N6O8S2
Molecular Weight:~637.4 g/mol
Chemical Type:Polyether-polydimethylsiloxane copolymer / silicone surfactant foam stabilizer

Physical Form:Liquid, saline suspension
Storage Temperature:~2–8 °C recommended
Appearance:Liquid (saline suspension)
Density:~1.5315 g/cm³ (reported; product-specific)
Boiling Point:~291 °C (measured attribute of component)
Refractive Index:~1.6000
pKa:~‒1.22 ± 0.2
XLogP3:~4.7 (suggests hydrophobic character of polymer segment)
Topological Polar Surface Area:248 Ų

Colour Index:~61205
Form / Physical State:Saline suspension / viscous liquid (product supplied form)
Color:Indexed “61205” (deep color, often blue/pigmented in some data sources)
Viscosity (25 °C):150–550 mPa·s (millipascal-seconds)
Density:1.015–1.025 g/mL (at 20 °C)
Boiling Point:~291 °C (literature-reported estimate)
Refractive Index:1.6000
Storage Temperature:2–8 °C recommended
Solidification Point:Below 0 °C, with reversible viscosity increase upon cooling

Chemical Type:Polyether-polydimethylsiloxane copolymer (non-hydrolysable silicone surfactant)
Function:Foam stabilizer and cell opener in rigid polyurethane foams
Hydrogen Bond Donor Count:5
Hydrogen Bond Acceptor Count:14
Rotatable Bond Count:6
Heavy Atom (non-H) Count:41
Formal Molecular Charge:0 (neutral)
Topological Polar Surface Area:248 Ų

XLogP3-AA (lipophilicity estimate):4.7
pKa (acid dissociation parameter reported):–1.22 ± 0.2 (indicates acidic proton contexts in associated dye structure; may not reflect macromolecular surfactant behavior)
Viscosity (25 °C):150 – 550 mPas
Density (20 °C):1.015 – 1.025 g/ml
Product Name:TEGOSTAB B 8523
CAS Number:13324-20-4
EC Number (EINECS):236-363-9

FIRST AID MEASURES of TEGOSTAB B 8523:
-Description of first-aid measures
*General advice:
Show this material safety data sheet to the doctor in attendance.
*If inhaled:
After inhalation: 
Fresh air.
*In case of skin contact: 
Take off immediately all contaminated clothing. 
Rinse skin with
water/ shower.
*In case of eye contact:
After eye contact: 
Rinse out with plenty of water. 
Call in ophthalmologist. 
Remove contact lenses.
*If swallowed:
After swallowing: 
Immediately make victim drink water (two glasses at most). 
Consult a physician.
-Indication of any immediate medical attention and special treatment needed.
No data available

ACCIDENTAL RELEASE MEASURES of TEGOSTAB B 8523:
-Environmental precautions:
Do not let product enter drains.
-Methods and materials for containment and cleaning up:
Cover drains. 
Collect, bind, and pump off spills. 
Observe possible material restrictions. 
Take up dry. 
Dispose of properly. 
Clean up affected area.

FIRE FIGHTING MEASURES of TEGOSTAB B 8523:
-Extinguishing media:
*Suitable extinguishing media:
Carbon dioxide (CO2) 
Foam 
Dry powder
*Unsuitable extinguishing media:
For this substance/mixture no limitations of extinguishing agents are given.
-Further information:
Prevent fire extinguishing water from contaminating surface water or the ground water system.

EXPOSURE CONTROLS/PERSONAL PROTECTION of TEGOSTAB B 8523:
-Control parameters:
--Ingredients with workplace control parameters:
-Exposure controls:
--Personal protective equipment:
*Eye/face protection:
Use equipment for eye protection. 
Safety glasses
*Body Protection:
protective clothing
*Respiratory protection:
Recommended Filter type: Filter A 
-Control of environmental exposure:
Do not let product enter drains.

HANDLING and STORAGE of TEGOSTAB B 8523:
-Conditions for safe storage, including any incompatibilities:
*Storage conditions:
Tightly closed. 
Dry.

STABILITY and REACTIVITY of TEGOSTAB B 8523:
-Chemical stability:
The product is chemically stable under standard ambient conditions (room temperature).
-Possibility of hazardous reactions:
No data available