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Two Component MS Sealant
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  • Two Component MS Sealant
sku: Flexibond 8938 2C
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Flexibond MS 8938 2C


Flexibond MS 8938 2C is a high viscos, sag-resistant, two-component adhesive based on silane modified polymers, which cures to an elastic product independent of humidity. The material is free of solvents, isocyanates and silicones. After component A has been thoroughly mixed with component B (MS 8937B) the curing starts independent of humidity to form an elastic material. One hour after mixing the elastic adhesive has got a high green strength. In order to really make use of the advantage of elastic bonding, care should be taken of a sufficient dimensional of the bonding joint. A minimum thickness is necessary so that the elastic adhesive is able to compensate the movements between the materials to be bonded under the influence of different temperatures during final use of the bonded part.




Silane modified polymer

Product Type





Cure at ambienttemperature (above 15°C) or cure at elevated temperatures




Component A: white, grey, black

Component B: white


Pasty, thixotropic



MixingRatio, by weight

Part A: Part B

10 : 1



Component A,density,g/cm³:                        approx. 1.43

Component B, density,g/cm³:                      approx. 1.3

Component A,

Skin formation time,min*:                             5-10

Component B,

Skin formation time,min*:                              -

Mixture (Component A+B)

Density, g/cm³:                                                approx. 1.43

Sag resistance:                                               no sagging (DIN profile15mm)

Pot life, min*:                                                   approx. 2 to 3

Open time, min:                                              approx. 5 to 10

Handling strength, hrs:                                 approx. 2 to 4


(ISO 868, Durometer A)*:                              > 60

Tensile strength

(acc. to ISO 37), MPa*:                                  approx. 4

Elongation at break

(acc. to ISO 37,

speed200 mm/min),%:                                approx. 120

E-Modulus, MPa:                                           approx. 3

Tensile shear strength

(acc. to ISO 4587), MPa:                               >2

Substrates:                                                     Al 99.5

Layer thickness, mm:                                   2

Cross head speed,mm/min:                      10

UV resistance:                                               no signif.changes

UV source:                                                     Osram Vitalux300W, dry UV

Distance to thespecimen, cm:                   25

Test period, weeks:                                      6

Reference IEC61215/61646 clause 10.13:

Damp heat testdurability **:                        given

Test period, hours:                                       1,000

Application temperature,°C:                       15 to 40

In service temperature

range, °C:                                                       -40 to +100

Short exposure (up to 1h), °C:                    160

* DIN 50014 standardclimate:                    23°C, 50% relative air humidity

**Damp heat conditions:85°C, 85% relative air humidity

Application Areas

Flexibond MS 8938 2C can be used for elastic bonding and sealing on many materials, such as glass, metal, painted surfaces and plastics. It is used where the cure speed of a conventional one-component adhesive is too slow.

Flexibond MS 8938 2C is used in the photovoltaic industry.


Preliminary statement:

Prior to application it is necessary to read the Material Safety Data Sheet for information about precautionary measures and safety recommendations. Also, for chemical products exempt from compulsory labeling,the relevant precautions should always be observed.


The substrates must be clean, dry, oil- and grease free. Depending on the surface it can be necessary to roughen the surface or to use a primer/adhesion promoter to provide best adhesion. Coronaor Plasma treatment improves the adhesion to many different materials. When manufacturing plastics, external release agents are often used; these agents must be accurately removed prior to starting bonding or sealing. Due to the different compositions of paints,especially powder paints and the large number of different substrates, application trials before use are necessary. When bonding and sealing PMMA, e.g. Plexiglas®,and polycarbonate, e.g. Makrolon® or Lexan®,under tension, stress corrosion cracking may occur. Application trials before use are necessary. There is no adhesion to polyethylene, polypropylene and PTFE (e.g.Teflon®). Substrates not mentioned above should be subject to trials.

General remarks:

Due to the rapid curing after the expiry of the pot life, the mixing equipment must be cleaned in time. Thereby, it must be remembered that the pot life depends on the temperature: a higher temperature accelerates the chemical reaction, whereas a reduction in temperature will retard it. The actual processing time depends on the technical conditions, the mixing equipment and the temperature. For component A itself, the atmospheric humidity is a decisive factor.


The material is applied using a hand-controlled applicator pistol or a stationary automatic valve. For more lengthy interruptions (for example overnight breaks) the pressure in the system should be dropped to zero. On request COMENS will provide information on manufacturers of such types processing systems.

Flexibond MS 8938 is metered and fed from hob bocks (pails) or drums, Flexibond MS 8937B is metered from hob bocks using two-component processing equipment and mixed by means of a static mixer. All the equipment including hoses and pipes must be protected from atmospheric humidity.


Flexibond MS 8938 / MS 8937B can be cured at ambient temperature (above 15°C)or at elevated temperature (up to 60°C).Higher temperature reduces the curing time; however, the fact that higher temperatures result in shorter processing times (pot life and open time) has to be kept in mind. During setting, care must be taken that sufficient pressure is exerted on the mating parts to hold them in place, i.e. to ensure that the parts are kept in contact with the adhesive over their entire bonding surface.


For cleaning application equipment contaminated with uncured MS 89382C,we recommend the use of COMENS Cleaner H.




Recommended Storage Temperature:10°C to 25°C

Shelf-life (in unopened original packaging): 12 months.




200L drum

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