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Professional adhesive and sealant products, industrial and building special materials and compounds

ADHESION PU25 is a permanently elastic, one component, gun grade polyurethane construction sealant. It cures under the influence of atmospheric moisture to form a low modulus sealant with excellent adhesive properties and resistance to ageing and weathering.

Surface preparation:

Surfaces must be clean, dry, free of water, oil, grease or rust and of sound quality. Remove all loose particles or residues with a jet of compressed air, sandpaper or hard brush. Glass, metal and other non-porous surfaces must be free of any coatings and wiped clean with solvent. Pre-cast panels using form-release agents other than polyethylene film must be sandblasted or mechanically abraded and dust free. ADHESION PU25 has very good adhesion properties without the use of primer on most common building materials. Consequently, the use of the primer is not necessary if the support to be sealed is properly prepared and consolidated.

However, varieties of brick, natural stone, plastics, paints, coatings and other treatments of surfaces often presents a difficult surface to which to adhere. Due to the number of unpredictable natures of these substrates, a preliminary test is recommended. If necessary, apply a coating of primer on the joint walls (Primer ADHESION 30 for porous surfaces).


Recommended application temperatures: 15°-25°C. For easier use or cold weather application we recommend the material to be stored at approximately 25°C prior to use.

In order to guarantee free movement of sealant in joints, it is imperative that the sealant does not adhere to the bottom of the joint, therefore for correct joint making a closed-cell polyethylene bead (joint backing rod) is to be placed at the proper depth.

Apply appropriate primer to joint sides and observe waiting time to avoid that trapped solvent, in condition of rising temperature, can blow bubbles in the uncured sealant. For best performance, sealant should be gunned into joint when the joint slot is at mid-point of its designed expansion and contraction. Firmly extrude sealant into the joint making sure that it is in full contact with the sides of the joint and with the backing rod at the bottom. Keep the nozzle in the sealant, continue on with a steady flow of sealant preceding the nozzle to avoid air entrapment. Avoid overlapping of sealant to eliminate entrapment of air.

For the successful sealing of joints it is essential that the following guidelines on joint configuration are observed:

For joints up to 12 mm wide, width to depth ratio = 1:1 For joints over 12 mm wide, width to depth ratio = 2:1.

Finishing indications and limitations:

Sealant should be tooled to a smooth finish ensuring a full contact to the sides and back up material into the joint, this will also contribute in breaking the air bubbles which may be formed inside the sealant. Masking tape should be used where sharp exact joint lines or exceptionally neat lines are required. Remove the tape whilst the sealant is still soft.

ADHESION PU25 may be painted. However some coatings may crack if movement occurs, preliminary tests recommended.

Avoid exposure to high levels of chlorine (avoid to seal joints in chlorinated swimming pools). Do not cure in the presence of curing silicone sealants.

Avoid contact with alcohol and other solvent cleaners during cure.


Finishing indications and limitations.

Do not apply when moisture or vapour transmission condition exists from the substrate as this can cause bubbling within the sealant.

White colour tends to yellow slightly when exposed to ultraviolet rays.

The ultimate performance of ADHESION PU25 depends on good joint design and proper application with joint surfaces properly prepared.

Cleaning of equipment:

Clean tools with acetone or alcohol immediately after use. Cured material can only be removed mechanically.

Personal protective measures:

Keep out of reach of children. If skin contact occurs, remove immediately and wash with soap and water.


ADHESION PU25 can be stored for 12 months in its original packaging (unopened container) at 10°- 25°C in a cool, dry place. The storage temperature should not exceed 25°C for extended periods of time. Keep away from wet areas, direct sunlight and heat sources.


Alu-cartridge 310ml: 12 cartridges per box.

Alu-PE bags 600 ml.: 20 bags per box.


Certificate of state registration № BY.70.71.008.E/000583.07.15 from 16.07.2015

Technical certificate suitability of materials and products for use in construction TC from 02.09.2016

Certified according to: ISO 11600/F/25LM and DIN 18540/F

Certified according to BS 6920-1:2000 - Suitability for use in contact with water for human consumption

Conform to: ASTM 920, ASTM 793-91 and DIN 11431

Matches Uniform sanitary and epidemiological and hygienic requirements for goods subject to sanitary-and-epidemiologic supervision (control), approved. Commission Decision of the Customs Union on 28.05.2010 №299. Chapter II Section 3 "Requirements for materials, reagents and equipment used for water treatment and purification" (Minutes of the Research 14.07.2015 №0115 / 5305 / 06-02).

Areas of Application:

• Sealing expansion and construction joints in vertical and horizontal applications 

• Joints in precast elements 

• External walling and cladding joints. 

• Weatherproofing of joints between brickwork, block-work, masonry, wood and concrete or metal frames. 

• Joints in walls, floors, balconies, around window or door frames 

• Joints in water channels and suitable for hydraulic general sealing with contact with water. 

• Bridge and balcony parapets. 

• Retaining walls 

• Roofing 

• Permanently elastic over a wide range of temperatures 

• Non-sag consistency 

• Non-sticky / does not pick up dirt 

• Short cut-off string 

• Easy to gun, can be easily smoothed and levelled out 

• Good adhesion on all typical construction materials 

• Good resistance to ageing, weathering and immersion in clensing agents, sea water, lime water and diluite caustic solutions 

• Over-paintable with many water and solvent based paints (preliminary tests recommended) 

Appearance - Thixotropic paste

Colour: White, Grey, Black. Others on request

Chemical nature - Polyurethane

Curing Mechanism - Moisture-curing

Curing through volume (1 day at 23°C and 50% r.h.)[mm] 2

Shore A (23°C and 50% r.h.; DIN 53505) 25 

Density [g/cc]

Colour black: 1,28 ± 0,02

Colour grey: 1,33 ± 0,02

Colour white: 1,35 ± 0,02

Tack-free time (23°C and 50% r.h.)[min] 120-140

Elastic modulus at 100% (ISO 37 DIN 53504)[N/mm2] ≤ 0.4

Tensile strength (ISO 37 DIN 53504)[N/mm2] ≥ 1.5

Elongation (ISO 37 DIN 53504)[%] ≥ 700

Movement accomodation factor 25% of total movement capacit

Application temperature [°C] from +5 to +40

Temperature Resistance [°C] -40/+90, for short period up 120