Sikaflex® Tank N
ELASTIC SEALANT FOR JOINTS EXPOSED TO CHEMICALS
Sikaflex® Tank N is a 1-component, moisture-curing, elastic joint sealant.
- High chemical resistance
- High mechanical resistance
- Movement capability of ± 25% (ISO 9047)
- Good application properties
Usage
Sikaflex® Tank N shall be used by professional applicators only. Sikaflex® Tank N is designed for use in areas that are used for the storage, filling and handling of water polluting liquids such as: floor joints in petrol stations, joints in handling areas, storage tanks and containment bunds, and movement and connection joints in parking garages.Advantages
- High chemical resistance
- High mechanical resistance
- Movement capability of ± 25% (ISO 9047)
- Good application properties
Packaging
600 ml foil pack, 20 foil packs per box
Colour
Concrete Grey.
Product Details
APPROVALS / STANDARDS
- European Technical Approval ETA-09/0272
Chemical Base
Polyurethane
Shelf Life
Sikaflex® Tank N has a shelf life of 12 months from the date of production, if stored in an undamaged, original, sealed packaging and if the storage conditions are met.
Storage Conditions
Sikaflex® Tank N shall be stored in dry conditions, where it is protected from direct sunlight and at temperatures between +5 °C and +25 °C.
Density
| ~1.50 kg/l | (ISO 1183-1) |
Shore A Hardness
| ~35 (after 28 days) | (ISO 868) |
Secant Tensile Modulus
| ~0.60 N/mm2 at 100% elongation (23 °C) | (ISO 8339) |
| ~1.10 N/mm2 at 100% elongation (−20 °C) |
Elastic Recovery
| ~80% | (ISO 7389) |
Tear Propagation Resistance
| ~8.0 N/mm | (ISO 34) |
Movement Capability
| ± 25% | (ISO 9047) |
Chemical Resistance
The following is a list of liquids for which the joint- sealing system is impermeable and resistant for up to 72 hours (medium duty). For these liquids Sikaflex® Tank N is approved according to TRwS (Technical Rules on substances Hazardous to Water) for sealing in storage / filling / handling facilities for water-polluting products.
Group no.* | Liquids |
DF 1 + 1a | Petrol (gasoline) for motor vehicles to DIN 51600 and DIN EN 590 |
DF 2 | Aviation fuels |
| DF 3 + 3a + 3b | Extra-light heating oil (DIN 51603-1), diesel fuel (DIN EN 590), unused internal combustion engine oils and unused vehicle gear oils, mixtures of saturated and aromatic hydrocarbons with an aromatic content < 20% by weight and a flash point > 55 °C |
| DF 4 | All hydrocarbons |
| DF 4a | Benzene and benzene-containing materials |
| DF 4b | Crude oils |
| DF 4c | Used internal combustion engine oils and used vehicle gear oils with a flash point > 55 °C. |
| DF 5 | Monohydric and polyhydric alcohols (< 48% by volume methanol) glycol ethers |
| DF 5a | All alcohols and glycol ethers |
| DF 5b | Monohydric and polyhydric alcohols ≥ C2 |
| DF 11 | Inorganic alkalis and alkaline-hydrolysing inorganic salts in aqueous solutions (pH > 8), excluding ammonia solutions and oxidising salt solutions (i. e. hypochlorite). |
*As specified in approval guidlines for joint-sealing systems in storage/filling/handling facilieites for water-polluting liquids, Part 1. See DIBt (German Institute for Construction Technology) documentation, Book 16.1.
Service Temperature
−40 °C to +70 °C
Joint Design
The relevant technical rules for joints with elastic sealants have to be considered.
All joint sealing in storage / filling / handling facilities for water-polluting liquids and in water pollution control have to be made according to the technical approval for Sikaflex® Tank N (ETA-09/0272) and its annexes. To avoid damage to sharp edges in in-situ concrete a chamfer (approx. 3–5 mm) should be made on the sides of the joint.
The joint width must be designed to suit the joint movement required and the movement capability of the sealant. The joint width shall be > 10 mm and < 35 mm. A width to depth ratio of 1:0.8 must be maintained (for exceptions, see table below).
Standard joint widths for joints between concrete elements
| Joint distance [m] | Min. joint width [mm] | Min. joint depth [mm] |
| 2 | 10 | 10 |
| 4 | 15 | 12 |
| 6 | 18 | 15 |
| 8 | 20 | 18 |
| 10 | 30 | 25 |
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 our Technical Service Department.
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, min. 3 °C above dew point temperature
Substrate Temperature
+5 °C to +40 °C
Curing Rate
| ~2.5 mm/24 hours (23 °C / 50% r.h.) | (CQP 049-2) |
Skin Time
| ~90 minutes (23 °C / 50% r.h.) | (CQP 019-1) |
Consumption
Joint length [m] per 600 ml foil pack | Joint width [mm] | Joint depth [mm] |
| 6 | 10 | 10 |
| 3.3 | 15 | 12 |
| 1.9 | 20 | 16 |
| 1.2 | 25 | 20 |
| 0.8 | 30 | 24 |
SUBSTRATE PREPARATION
The substrate must be clean, dry, sound and homogeneous, free from oils, grease, dust and loose or friable particles. Cement laitance must be removed. Grinding the surface of non-porous substrates with a very fine abrasive pad may improve the adhesion performance of Sikaflex® Tank N.
The Sikaflex® Tank N joint sealing system is approved for application on uncoated liquid proofed precast concrete elements. Sikaflex® Tank N has a technical approval for use in storage / filling / handling facilities for water-polluting liquids or grade ≥C35/C45 ≤C50/60 (EN 206-1), in-situ concrete to DIN 1045 as “FD” (liquid proof) concrete, or “FDE” (penetration-tested liquid-proof) concrete.
Non- porous substrates
Aluminium, anodised aluminium, stainless steel, galvanised steel, powder coated metals or glazed tiles have to be cleaned and pre-treated using Sika® Aktivator-205, wiped on with a clean towel. Before sealing, allow a flash-off time of > 15 minutes (< 6 hours).
Other metals, such as copper, brass and titanium-zinc, also have to be cleaned and pre-treated using Sika® Aktivator-205,wiped on with a clean towel. After the necessary flash-off time, use a brush to apply Sika® Primer-3 N and allow a further flash-off time of > 30 minutes (< 8 hours) before sealing the joints.
PVC has to be cleaned and pre-treated using Sika® Primer-215 applied with a brush. Before sealing, allow a flash-off time of > 30 minutes (< 8 hours).
Porous substrates
Concrete, aerated concrete and cement-based renders, mortars, and brick have to be primed with Sika® Primer-215, for uses in accordance with ETA-09/0272, or Sika® Primer-3 N applied with a clean brush or roller. Before sealing allow a flash-off time of >30 minutes (<8 hours).
For more detailed advice and instructions please contact the local Sika Technical Services Department.
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.