SikaHyflex®-250 Facade
SikaHyflex®-250 Facade is a 1-component, moisture-curing, low-modulus elastic joint sealant.
SikaHyflex®-250 Facade is especially suitable for joint sealing according to the rules of DIN 18540 and also for connection joints.
- Sealant according to DIN 18540-fb
- Very good weathering resistance
- Movement capability of 25%
- Bubble-free curing
- Low stress to the substrate
- Very good extrusion and workability
- Good adhesion to many different substrates
- Solvent-free, very low emissions
Usage
SikaHyflex®-250 Facade is designed for the elastic joint sealing and waterproofing of movement and connection joints in building envelopes. Joints in building construction, which have been designed according to the DIN 18540. Connection joints at windows and doors, concrete and plaster facades, natural stone facades, parapets and many other building components.Advantages
- Sealant according to DIN 18540-fb
- Very good weathering resistance
- Movement capability of 25%
- Bubble-free curing
- Low stress to the substrate
- Very good extrusion and workability
- Good adhesion to many different substrates
- Solvent-free, very low emissions
Packaging
300 ml cartridge, 12 cartridges per box
600 ml foil pack, 20 foil packs per box
Colour
Uni white, cream ivory, beige, buff, brown, dark brown, pebble grey, concrete light grey, concrete grey, medium grey, dark grey, basalt grey,
anthracite grey, black
Product Details
CERTIFICATES AND TEST REPORTS
- DIN 18540-fb, SKZ Würzburg
- EN 15651-1 F EXT-INT CC 25 LM, SKZ Würzburg
- ISO 11600 F 25 LM, SKZ Würzburg
- EMICODE EC1PLUS
- Migration behaviour EN 1186, EN 13130,
CEN/TS 14234, ISEGA, - EN 13501-1 Class E (Fire behaviour)
Composition
i-Cure® Technology polyurethane
Shelf life
15 months from the date of production
Storage conditions
The product must be stored in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +5 °C and +25 °C, where it is protected from direct sunlight. Always refer to packaging.
Density
| ~1.35 kg/l | (ISO 1183-1) |
Shore A hardness
| ~20 (after 28 days) | (ISO 868) |
Secant tensile modulus
~0.30 N/mm2 at 100% elongation (23 °C) | (ISO 8339) |
| ~0.60 N/mm2 at 100% elongation (−20 °C) |
Elastic recovery
| > 75% | (ISO 7389) |
Tear propagation resistance
~5.0 N/mm | (ISO 34) |
Movement capability
| 25% | |
Resistance to fire
| Class E | (DIN EN 13501-1) |
Resistance to weathering
10 | (ISO / DIS 19862) |
Diffusion resistance to water vapour
| µ ~ 2.500 | (DIN EN 12572) |
Service temperature
−40 °C to +70 °C
Joint design
Joint layout and dimensions must be considered in the planning, because the installer usually has no possibility to change the joints. Calculation basis for the required joint width are the technical characteristics of the joint sealant and of the building materials, the stress of the building components, their construction and their size.
The joint width must be designed to suit the movement capability of the sealant. The joint width must be ≥ 10 mm and ≤ 35 mm. A width to depth ratio of 2:1 must be maintained (for exceptions, see table below).
Minimum joint width for movement joints: 10 mm
Standard joint widths for joints between concrete elements:
| Joint distance [m] | Min. joint width [mm] | Min. joint depth [mm] |
| 2 | 15 | 8 |
| 2 - 3,5 | 20 | 10 |
| 3,5 - 5 | 25 | 12 |
| 5 - 6,5 | 30 | 15 |
| 6,5 - 8 | 35 | 15 |
All joints must be correctly designed and dimensioned in accordance with the relevant standards,e.g DIN 18540, before their construction.
For larger joints please contact Sika Deutschland GmbH
Application
Backing material
Use closed cell, polyethylene foam backing rods.
Sag flow
| 0 mm (20 mm profile, 50 °C) | (ISO 7390) |
Ambient air temperature
+5 °C to +40 °C
Substrate temperature
+5 °C to +40 °C, min. 3 °C above dew point temperature
Curing rate
~3 mm/24 hours (23 °C / 50% r.h.) | (CQP 049-2) |
Skinning time
~70 minutes (23 °C / 50% r.h.) | (CQP 019-1) |
Consumption
| Joint length [m] per 600 ml foil pack | Joint width [mm] | Joint depth [mm] |
| ~ 7,5 | 10 | 8 |
| ~ 5,0 | 15 | 8 |
| ~ 3,0 | 20 | 10 |
| ~ 2,0 | 25 | 12 |
| ~ 1,3 | 30 | 15 |
SUBSTRATE PREPARATION
The substrate must be clean, dry, sound and free from oils, grease, dust, cement laitance, loose or friable particles, paint, hydrophobizing and antigrafitti-
coating.
SikaHyflex®-250 Facade has very good adhesion properties on many clean and solid surfaces. However, for optimum adhesion and critical, high performance applications, such as on multi-story buildings, highly stressed joints, extreme weather exposure or water immersion, the following priming and/or pre-treatment procedures shall be followed:
Non-porous substrates
Anodised aluminium, stainless steel, enamel or glazed tiles has to be cleaned and pre-treated using Sika® Aktivator-205 applied with a clean, lint-free cloth.
Before sealing, allow a waiting time of > 15 minutes
(< 6 hours).
2-component coatings or paints, based on EP, UP or PU, epoxy-resin mortars and coatings, GRP based on EP, UP or PU, powder coated metals, bare aluminium, and galvanised steel has to be slightly roughend with a fine abrasive pad (e.g. siavlies very fine). Clean and pre-treat using Sika® Aktivator-205 applied with a clean, lint-free cloth. Before sealing, allow a waiting time of > 15 minutes (< 6 hours).
Other metals, such as copper, brass and titanium-zinc, clean and pre-treat using Sika® Aktivator-205 applied with a clean, lint-free cloth. After a waiting time of > 15 minutes (< 6 hours), apply Sika® Primer-3 N applied by brush. Before sealing, allow a waiting time of > 30 minutes (< 8 hours)
Unplasticised PVC has to be cleaned and pre-treated using Sika® Primer-215 applied with a brush. Before sealing, allow a waiting time of > 30 minutes
(< 8 hours).
Porous substrates
Concrete, aerated concrete and cement-based renders, mortars, bricks and weathered wood surfaces must be primed using Sika® Primer-3 N applied by brush. Before sealing, allow a waiting time of > 30 minutes (< 8 hours).
For projects with sustainability certification (e.g. DGNB or LEED), we recommend the water-based Sika® Primer-4 W on porous substrates, for joints at facades and windows.
Note: Primers and activators are adhesion promoters and not an alternative to improve poor preparation / cleaning of the joint surface. Primers also improve the long-term adhesion performance of the sealed joint.
Contact Sika Deutschland GmbH for additional
information.
CLEANING OF EQUIPMENT
Clean all tools and application equipment with Sika® Remover-208 or Sika® PowerClean cleaning wipes,
immediately after use. Hardened material can only be removed mechanically.
For cleaning skin use suitable cleaning wipes, e.g. Sika® PowerClean cleaning wipes, or other suitable skin cleaner and water.
Dont´t use solvents at the skin!