Product Data Sheet Safety Data Sheet Show all documents
Sikaflex® Construction Pro

Sikaflex® Construction Pro

High-performance polyurethane sealant

Sikaflex® Construction Pro is a one-component, moisture-curing, low-modulus polyurethane sealant for construction sealing applications. It cures to form a durable and elastic joint seal with long-term flexibility and consistent performance across a range of common construction substrates.

  • Movement capability of ± 25 %
  • High elasticity and flexibility
  • Adheres to a wide range of common construction substrates
  • Low shrinkage during curing
  • Bubble-free curing under normal conditions
  • Thixotropic, non-sag consistency
  • Suitable for vertical and overhead applications
  • Non-tacky surface after curing
  • Easy application and tooling
  • Can be overcoated after curing 
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Product Data Sheet Safety Data Sheet Show all documents

Usage

Sikaflex® Construction Pro adheres to typical construction materials including cement-based substrates, brick, ceramic, glass, wood, galvanized and painted metals. Sikaflex® Construction Pro is suitable for a wide range of construction applications, including:
  • Expansion joints between similar and dissimilar construction materials
  • Movement and connection joints in vertical and horizontal applications
  • Joints in indoor and outdoor pedestrian and light traffic areas
  • Joints between prefabricated construction elements
  • Sealing of ventilation ducts, gutters, and drainage components
 

Advantages

  • Movement capability of ± 25 %
  • High elasticity and flexibility
  • Adheres to a wide range of common construction substrates
  • Low shrinkage during curing
  • Bubble-free curing under normal conditions
  • Thixotropic, non-sag consistency
  • Suitable for vertical and overhead applications
  • Non-tacky surface after curing
  • Easy application and tooling
  • Can be overcoated after curing 

Packaging

600 ml (20.3 US fl. oz) sausage / 12 sausages per box

Colour

Black, White, Limestone, Aluminum Grey

Product Details

Sustainability / Certifications / Approvals

APPROVALS / CERTIFICATES

Complies with ASTM C920 for Elastomeric Joint Sealants, Class 25 (Type S, NS; Uses NT/A/M).
Product Information

Composition / Manufacturing

Polyurethane

Shelf Life

15 months from date of production

Storage Conditions

Store in original, unopened, and undamaged packaging in dry conditions, protected from direct sunlight, at temperatures between 10 °C (50 °F) and 25 °C (77 °F)

Density

1.20 ± 0.03 g/ml (approx. 10.0 ± 0.25 lb/US gal)

Consistency

Thixotropic
Technical Information

Shore A Hardness

30-35 After full cure

(ASTM C661)

Elastic Recovery

≥ 70 % After full cure

(ISO 7389)

Movement Capability

± 25 %

Service Temperature

−40 °C to 90 °C (−40 °F to 194 °F)

Joint Design

Joint width/depth ratio should be approximately 2:1

Elongation at break

≥ 600 %

(ASTM D412 [Dumble test])

≥ 100 %(ISO 8339 [Glass–Glass])

Application

Application Information

Backing Material

Use Sikaseal®-414 Backer Rod to control joint depth and prevent three-sided adhesion

Sagging

0 mm 

(EN ISO 7390)

Substrate Temperature

5 °C to 40 °C (41 °F to 104 °F)

Curing Rate

≥ 2.5 mm / 24 h (0.098 in / 24 h) at 23 °C (73 °F) and 50% RH

Tack-free time

20 – 70 minutes (23 °C [73 °F], 50% RH)

Curing Treatment

Moisture curing
Consumption

Yield

Joint Width

Joint Depth

Joint Length / 600ml (20.3 US fl. oz) sausage

15 mm (5/8 in)

8 mm (¼ in)

5 m (16 ½ ft)

20 mm (¾ in)

10 mm (3/8 in)

3 m (9 ¾ ft)

25 mm (1 in)12 mm (½ in)2 m (6 ½ ft)
30 mm (1 ¼ in)15 mm (5/8 in)1.3 m (4 ¼ ft)
35 mm (1 3/8 in)15 mm (5/8 in)1.1 m (3 ¾ ft)
Application steps

SUBSTRATE PREPARATION

The substrate must be sound, clean, and dry before applying Sikaflex® Construction Pro. Remove all dust, loose particles, oils, and contaminants that could impair adhesion using a stiff brush or compressed air. For cracks of significant depth, install a suitable backer rod to control joint depth and prevent three-sided adhesion. Ensure the substrate is free from standing water and frost prior to application.

  

Appropriate preparation depends on the substrate:

  • Glass: Degrease using alcohol or MEK.
  • Aluminum, light alloys, stainless steel: Degrease using alcohol or MEK.
  • Other metals: Lightly abrade the surface, then degrease with alcohol or MEK.
  • Wood: Lightly abrade and remove surface dust.
  • Concrete and other alkaline surfaces: Brush to remove dust and loose material.

APPLICATION

Apply Sikaflex® Construction Pro evenly into the joint using a suitable sausage gun. Tool the sealant immediately after application to ensure full contact with the joint surfaces and a smooth finish.

Use a backer rod to control joint depth, maintain proper joint dimensions, and prevent three-sided adhesion, which can restrict sealant movement. The backer rod should be at least 25% wider than the joint width.

CLEAN UP

Uncured sealant can be removed from tools and surfaces using a suitable solvent such as alcohol or MEK, while cured sealant must be removed mechanically.

 

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