SikaHyflex®-305 AP
SikaHyflex®-305 AP is a 1-component, moisture curing, low-modulus elastic weather sealant.
- Very good resistance to weathering
- Movement capability of ±50 % (ASTM C 719)
- Very good workability
- Good adhesion to a wide range of substrates
- Solvent-free
- Neutral cure
Usage
SikaHyflex®-305 AP is designed for weather proofing and sealing applications where durability under severe conditions is required. SikaHyflex®-305 AP is particularly suited for use as a weather sealant for curtain wall and metal cladding facades.Advantages
- Very good resistance to weathering
- Movement capability of ±50 % (ASTM C 719)
- Very good workability
- Good adhesion to a wide range of substrates
- Solvent-free
- Neutral cure
Packaging
300 ml cartridge, 25 cartridges per box
Colour
Black, Grey
Further colour available on request
Product Details
APPROVALS / STANDARDS
- ASTM C 920, class 50
Chemical Base
Neutral cure silicone
Shelf Life
SikaHyflex®-305 AP has a shelf life of 12 months for cartridges from the date of production, if it is stored in undamaged, original, sealed packaging, and if the storage conditions are met.
Storage Conditions
SikaHyflex®-305 AP shall be stored in dry conditions, where it is protected from direct sunlight.
Density
| ~ 1.50 kg/l | (ISO 1183-1) |
Compatibility
SikaHyflex®-305 AP is compatible with most SikaHyflex® and Sikasil® silicone weather sealants, Sikasil® SG adhesives and Sikasil® IG sealants. All other sealants and adhesives have to be approved by Sika before using them in direct contact with SikaHyflex®-305 AP.
Where two or more different reactive sealants and/or adhesives are used, allow the first one to cure completely before applying the next one. For specific information regarding compatibility contact Sika technical service.
Shore A Hardness
| ~ 25 (after 28 days) | (ISO 868) |
Secant Tensile Modulus
| ~ 0.35 N/mm2 at 100 % elongation (23 °C ) | (ISO 8339) |
| ~ 0.40 N/mm2 at 100 % elongation (−20 °C) |
Elastic Recovery
| ~ 80 % | (ISO 7389) |
Tear Propagation Resistance
~ 4.5 N/mm | (ISO 34) |
Movement Capability
| ± 25 % | (ISO 9047) |
| ± 50 % | (ASTM C 719) |
Resistance to Weathering
10 | (ISO / DIS 19862) |
Service Temperature
−40 °C to +150 °C
Joint Design
The joint width must be designed to suit the joint movement required and the movement capability of the sealant. The joint width shall be ≥ 6 mm and ≤ 45 mm. The joint depth shall be ≥ 6 mm and ≤ 15 mm. A width to depth ratio of 2:1 must be maintained (for exceptions, see table below).
Typical joint dimensions
| Joint width [mm] | Joint depth [mm] |
| 10 | 6 |
| 15 | 8 |
| 20 | 10 |
| 30 | 15 |
| 45 | 15 |
All joints must be correctly designed and dimensioned in accordance with the relevant standards, before their construction. The basis for calculation of the necessary joint widths are the type of structure and its dimensions, the technical values of the adjacent building materials and the joint sealing material, as well as the specific exposure of the building and the joints.
For larger joints please contact Sika technical service.
Application
Backing Material
Use closed cell, polyethylene foam backing rods
Sag Flow
~ 2 mm (20 mm profile, 50 °C) | (ISO 7390) |
Ambient Air Temperature
+5 °C to +40 °C, min. 3 °C above dew point temperature
Substrate Temperature
+5 °C to +40 °C
Curing rate
| ~ 2 mm / 24 hours (23 °C / 50 % r.h.) | (CQP 049-2) |
Skin Time
| ~ 25 minutes (23 °C / 50 % r.h.) | (CQP 019-1) |
Tack Free Time
| ~ 160 minutes (23 °C / 50 % r.h.) | (CQP 019-1) |
Consumption
Joint length [m] per 600 ml foil pack | Joint width [mm] | Joint depth [mm] |
| 10 | 10 | 6 |
| 5 | 15 | 8 |
| 3 | 20 | 10 |
| 2 | 25 | 12 |
| 1.3 | 30 | 15 |
SUBSTRATE PREPARATION
The substrate must be clean, dry, sound and homogeneous, free from oils, grease, dust and loose or friable particles. The following priming and/or pre-treatment procedures shall be followed:
Non-porous substrates
Float glass, coated glass, anodised aluminium and stainless steel have to be pre-treated using Sika® Aktivator-205, Sika® Aktivator-100 or Sika® Cleaner P. Powder coated and PVDF coated metals have to be pre-treated using Sika® Aktivator-205. For details like application and flash-off times refer to the most recent PDS of the respective pre-treatment product.
Porous substrates
Concrete, aerated concrete and cement based renders, mortars and bricks shall be primed using Sika® Primer-3 N or Sika® Primer-210. For details like application and flash-off times refer to the most recent PDS of the respective pre-treatment product.
Adhesion tests on project specific substrates must be performed prior to application. For more detailed advice and instructions please contact Sika technical service. Note: Primers are adhesion promoters. They are neither a substitute for the correct cleaning of a surface, nor do they improve the strength of the surface significantly.
CLEANING OF TOOLS
Clean all tools and application equipment immediately after use with Sika® Remover-208 and/or Sika® TopClean T. Once cured, residual material can only be removed mechanically.