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Damp Surface Polyurethane Joint Sealant:  


Dymonic 100


High performance, high movement polyurethane sealant




Dymonic 100 is a high performance, medium-modulus, low-VOC, UV stable, non-sag polyurethane sealant. Formulated with an innovative polymer technology similar to TREMproof 250GC. Dymonic 100 is a highly versatile sealant that has a unique capability to adhere to damp or green concrete.


Usage / Purpose


Dymonic 100 is a durable, flexible, sealant that offers excellent performance in moving joints and exhibits tenacious adhesion once fully cured. Typical applications for Dymonic 100 include:


Expansion and control joints

Precast concrete panel joints

Perimeter caulking (windows, doors, panels)




Packaging product code


600ml sausages 240123


Colour: Limestone


Technical information



(Typical Properties)

Rheological (ASTM C639)

non-sag (NS)

Hardness (ASTM C661)

40 + 5

Weight Loss (ASTM C1246)


Skin Time (ASTM C679)

2-3 hr

Tack Free Time (23oC 50% RH)

6-8 hr

Stain (ASTM C510)

No stain

Colour Change (ASTM C510)

No visible colour change

Effects of Accelerated Aging (ASTM C793)


Movement Capability (ASTM C719*)


Tensile Properties (ASTM D412)


Tensile Strength

% Elongation

Modulus at 100%



2.4-3.1 MPa


0.5-0.6 MPa

Tear Strength (ASTM D624) 0.4-0.5 MPa


Service  Range  -40 C to 82 C


Application Temperature 0 C to 38 C



NOTE: Typical Properties should not be used as Specifications.

*Modified ASTM C719


Usage guidelines


Joint design


Dymonic 100 may be used in vertical or horizontal joints de­signed in accordance with accepted architectural/engineering practices. Joint width should be 4 times anticipated movement, but not less than 6mm.


Joint backing


Closed cell or open cell backer rod is recommended as joint backing to control sealant depth and to ensure intimate contact of sealant with joint walls when tooling. Where depth of joint will prevent the use of backer rod, an adhesive backed polyethylene tape (bond breaker tape) should be used to prevent three-sided adhesion. All backing should be dry at time of sealant application.


Coverage rate


(Approximate Linear Metres per 600ml Sausage)











6mm (min)










12mm (max)






Expansion Joints


The minimum width and depth of any sealant application should be 6mm by 6mm. The depth (D) of sealant may be equal to the width (W) of joints that are less than 12mm wide. For joints ranging from 12mm to 25mm wide, the sealant depth should be approximately one-half of the joint width.

The maximum depth (D) of any sealant application should be 12mm.


Window Perimeters


For fillet beads, or angle beads around windows and doors, the sealant should exhibit a minimum surface contact area (C) of 6mm onto each substrate.


Surface preparation


  • Surface must be sound and clean
  • Leave concrete 24 hours after stripping formwork.
  • All release agents, existing waterrpoofing, dust, loose mortar, paints, or other finishes must be removed.
  • This can be accomplished with a thorough wire brushing, grinding, sand blasting, or solvent washing, depending on the contamination.
  • Surface temperatures must be 5OC or above at the time the sealant is applied. If sealant must be applied in tempera­tures below 5OC please refer to a Tremco Representative for further guidance.




Dymonic 100 typically adheres to common construction sub­strates without primers. However, We always recommend that a mock-up or field adhesion test be performed on the actual materials being used on the job to verify the need for a primer. A description of the field adhesion test can be found in appendix X1 of ASTM C 1193, Standard Guide for Use of Joint Sealants. Where deemed necessary, use Vulkem Primer #171 on porous substrates and TREMprime Non-Porous Primer for metals or plastics.




Dymonic 100 is easy to apply with conventional caulking equipment. Ensure that the backer rod is friction fitted properly and any primers have been applied.


Fill the joint completely with a proper width-to-depth ratio, and tool to ensure intimate contact of sealant with joint walls.

Dry tooling is always preferred.For a cleaner finish, mask the sides of the joint with tape prior to filling.


Cure time


Dymonic 100 generally cures at a rate of 2.5mm per day at 24OC and 50% relative humidity. Dymonic 100 will skin in 2 hours and be tack free in 6-8 hours. The cure time will increase as temperatures and/or humidity decrease.


Clean up


Excess sealant and smears adjacent to the joint interface can be carefully removed with xylene or mineral spirits before the sealant cures. Any utensils used for tooling can also be cleaned with xylene or mineral spirits.




Use with adequate ventilation.

Do not apply to ponded water surfaces.


Shelf life


12 months when stored as recommended in original unopened packaging.


Health & safety precautions


The Material Safety Data Sheet (MSDS) must be read and understood prior to use 


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