Elastic polyurethane sealant for tanks and silos Sikaflex-403 Tank & Silo is a 1-part, moisture-curing, elastic polyurethane sealant which is resistant to organic acids as found in liquid manure and silage liquids. The Product is used for sealing segmented and bolted tanks, concrete containers and floor joints and sewage systems. - Resistant to organic acids such as silage liquids.
- Resistant to domestic and municipal sewage, liquid manure and silage liquid.
- Resistant to wastewater such as domestic and municipal sewage and liquid manure.
- Resistant to temperatures of +65 °C as found in thermophilic digestors.
- Very low swelling in organic acids enabling use for floor joints traficked by front loaders.
- Good mechanical resistance.
- Very good resistance to specific chemicals.
- Very good tear propagation resistance.
- Movement capability of ± 20 % (ISO 9047).
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Usage Sikaflex-403 Tank & Silo is used for: - Sealing joints that are exposed to organic acids. A typical application is the sealing of joints in segmented and bolted enameled steel or stainless steel tanks including wall-to-floor connection.
Sikaflex-403 Tank & Silo is used for the following areas: - Tanks for the anaerobic digestion process including biogas tanks.
- Tanks for thermophilic and mesophilic digestion for biogas production.
- Liquid manure tanks.
- Drive-in silos for agricultural use.
- Agricultural stables.
- Silage clamp retaining walls.
- Domestic and municipal sewage treatment plants including wastewater.
- Floor joints where very high chemical resistance to organic acids is required.
Advantages - Resistant to organic acids such as silage liquids.
- Resistant to domestic and municipal sewage, liquid manure and silage liquid.
- Resistant to wastewater such as domestic and municipal sewage and liquid manure.
- Resistant to temperatures of +65 °C as found in thermophilic digestors.
- Very low swelling in organic acids enabling use for floor joints traficked by front loaders.
- Good mechanical resistance.
- Very good resistance to specific chemicals.
- Very good tear propagation resistance.
- Movement capability of ± 20 % (ISO 9047).
Packaging 600 ml cylindrical 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 current price list for the colour range. |
Technical Information Shore A Hardness 40 (after 28 days) | (EN ISO 868) |
Secant Tensile Modulus 0.90 N/mm2 at 60 % elongation (+23 °C) | (ISO 8339) |
Tear Propagation Resistance
Chemical Resistance IMPORTANT Depolymerisation due to chemical attack The Product is not fully chemically resistant until the Product has fully cured. Moreover, chemical resistance depends on the chemicals, their concentration and their temperature. Exceeding the stated performance limits could cause depolymerisation of the sealant. - Analyze the content, exposure time and temperature of the chemicals.
- Design the joints for the intended and foreseeable conditions.
Sikaflex-403 Tank & Silo is resistant to: Sikaflex-403 Tank & Silo is not resistant to:
Service Temperature IMPORTANT Depolymerisation due to exceeded service temperature In any process system, service temperatures affect the aggressiveness of the chemical mixture. Exceeding the stated performance limits could cause depolymerisation of the sealant. - During specification, analyze the content of the chemicals to establish their behavior at temperature, and to define the continuous maximum service temperature.
Service temperature range in a dry condition. Maximum | +80 °C | Minimum | -40 °C |
Maximum service temperature in a wet condition. Movement joints | ≤ +45 °C | Overlap sealing | ≤ +65 °C |
Joint Design Refer to all relevant local construction guidelines and regulations. The sealant must be specified and included in the design of the containment system. Reference must be made to the following document: Design guideline: Dimensioning of construction joints.
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Application Information Backing Material Use closed cell, polyethylene foam backing rod. Sag Flow 20 mm profile tested at +50 °C | 0 mm |
Product Temperature Maximum | +40 °C | Minimum | +5 °C |
Ambient Air Temperature Maximum | +40 °C | Minimum | +5 °C |
Substrate Temperature Maximum | +40 °C | Minimum | +5 °C |
Curing Time 3.5 mm / 24 hours | (CQP049-2) |
Skin Time At +23 °C and 50 % r.h. | 5 hours |
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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.
