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Sikaflex-403 Tank & Silo, Elastic Polyurethane Sealant for Tanks & Silos, Interior & Exterior, Grey, 600 mL

Sikaflex-403 Tank & Silo, Elastic Polyurethane Sealant for Tanks & Silos, Interior & Exterior, Grey, 600 mL

Adhesives & Sealants
SIKA

Sika is a global leader in specialty chemicals for the construction and industrial sectors. The company develops and supplies innovative products and systems for bonding, sealing, damping, reinforcing, and protecting structures. With a strong focus on sustainability and performance, Sika serves a wide range of applications including concrete production, waterproofing, roofing, flooring, and structural strengthening.

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General Specifications
Packaging 600 mL
Usage Sealing Tanks, Silos, Joints Exposed To Organic Acids
Usage Area Interior & Exterior
Color Grey
Chemical Base Polyurethane
Storage Conditions +5 °C to +25 °C - Store in sealed, undamaged packaging in dry conditions. Refer to packaging and safety data sheet.
Density 1.20 kg/L
Service Temperature -40 >< +80
Application Time N/A
Curing Time 24 hours
Application Thickness N/A
Application Method Gun
UV Resistant Yes
Moisture Resistant Yes
Mold Resistant No
Paintable No
Sealant Yes
Flexible Yes

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).
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)

Elastic Recovery

80 %

(EN ISO 7389)

Tear Propagation Resistance

10.0 N/mm

(ISO 34-2)

Movement Capability

± 20 %

(EN ISO 9047)

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.

  1. Analyze the content, exposure time and temperature of the chemicals.
  2. Design the joints for the intended and foreseeable conditions.

Sikaflex-403 Tank & Silo is resistant to:

  • Water

  • Sea water

  • Liquid manure

  • Silage liquid

  • Dilute alkali

  • Neutral water-based dispersed detergents or cleaners

  • Domestic and municipal sewage

Sikaflex-403 Tank & Silo is not resistant to:

  • Concentrated organic and inorganic acids

  • Organic solvents

  • Chlorinated or aromatic hydrocarbons

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.

  1. 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.
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