Low-modulus sealant for concrete and masonry facades Sikaflex Construction Purform is a 1-part, non-sag, elastic polyurethane joint sealant. Due to its good application properties and high movement capability it durably seals movement and connection joints in concrete and masonry facades. - Easy to extrude and tool.
- High movement capability: ±25 % (ISO 9047), ±50 % (ASTM C719).
- Low stress on substrate due to the low modulus of the sealant.
- Good resistance to weathering.
- Good mechanical resistance.
- Good adhesion to many construction materials.
- Monomeric diisocyanate content < 0.1 %: no user safety training needed (REACH restriction 2023, Annex XVII entry 74).
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Usage The Product is used for elastic joint sealing and weatherproofing of movement and connection joints in building envelopes. Sikaflex Construction Purform is used for the following application areas: - Around window and door frames.
- Around facade elements.
- Around precast elements.
- EIFS facades.
Sikaflex Construction Purform is used for interior and exterior applications. Advantages - Easy to extrude and tool.
- High movement capability: ±25 % (ISO 9047), ±50 % (ASTM C719).
- Low stress on substrate due to the low modulus of the sealant.
- Good resistance to weathering.
- Good mechanical resistance.
- Good adhesion to many construction materials.
- Monomeric diisocyanate content < 0.1 %: no user safety training needed (REACH restriction 2023, Annex XVII entry 74).
Packaging | 600 ml foil pack | 20 foil packs per box | | | |
Refer to the current price list for available packaging variations. Colour Available in a range of colours, refer to the price list for further information. |
Technical Information Shore A Hardness Cured 28 days at +23 °C and 50 % R.H. | > 20 |
Tensile Strength Cured 28 days at +23 °C and 50 % R.H. | 0.96 MPa |
Secant Tensile Modulus | Cured 28 days at +23 °C and 50% R.H. Measured at 100% elongation at +23 °C. | 0.30 N/mm2 | | Cured 28 days at +23 °C and 50% R.H. Measured at 100% elongation at -20 °C. | 0.60 N/mm2 |
Elastic Recovery Cured 28 days at +23 °C and 50 % R.H. | 90 % |
Tear Propagation Resistance Cured 28 days at +23 °C and 50 % R.H. | 6.0 N/mm |
Service Temperature Maximum | +70 °C | Minimum | -40 °C |
Joint Design For movement joints, the width must be at least 8 mm and should not exceed 40 mm. For non-movement joints such as connection joints in interior areas, the joint width can be less than 8 mm. The joint dimensions must be designed to suit the movement capability of the sealant. In all cases joints must be at least 8 mm deep or a have a width to depth ratio of 2 : 1 whichever is greater. For more information about joint design and calculations refer to the Sika document Design guideline: Dimensioning of construction joints or contact Sika Technical Services.
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Application Information Sag Flow | 20 mm profile tested at +50 °C. | 0 mm |
Product Temperature Maximum | +40 °C | Minimum | +5 °C |
Ambient Air Temperature Maximum | +30 °C | Minimum | +5 °C |
Substrate Temperature Maximum | +40 °C | Minimum | +5 °C |
Beware of condensation. Substrate temperature during application must be at least +3 °C above dew point. Backing Material Use closed cell, polyethylene foam backing rod. Curing Rate At +23 °C and 50 % R.H. | 3 mm / 24 h |
Skin Time At +23 °C and 50 % R.H. | 60 minutes |
Tooling Time At +23 °C and 50 % R.H. | 40 minutes |
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The above design is only a sample of the options available, for reference purposes only. Our policy of continuous improvement may result in a change of specifications without notice. If any discrepencies might be between the data sheet values and standards, we reserve the rights to make technical changes. Our company will not be held responsible, as all or any of pictures, drawings, weights and dimensions details or other elements in this document are only indicative and must not be considered contractual. Contact our sales team for other specifications or custom made products.
Contact our sales team for other specifications or custom made products.
