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SIKA INDUSTRY
SikaFast®-5221

SikaFast®-5221

Product catalog summary

Technical Product Data
SikaFast®-5221 is a fast curing, two-component structural adhesive with an open time of approximately 9 minutes. It consists of Component A (SikaFast®-5221) and Component B (SikaFast®-5200), both based on ADP acrylic chemistry. The mixed product is grey, thixotropic, and cures through polymerisation. Key properties include a density of approximately 1.14 g/cm³ for Component A and 1.46 g/cm³ for Component B, a mixing ratio of 10:1 by volume, and a service temperature range from -40°C to +80°C.

Description and Benefits
SikaFast®-5221 is designed for high-strength fastening of concealed joints on various substrates, including metals and plastics, without extensive substrate preparation. It offers benefits such as rapid strength development, flexibility, vibration damping, and is solvent and acid-free. It is approved for incidental food contact and is manufactured under ISO 9001/14001 standards.

Application and Cure Mechanism
The adhesive is applied using a 2-C cartridge or pump with a static mixer. It has a relatively long open time, allowing for adjustments within 9 minutes, followed by fast curing. The adhesive should be allowed to cure for 25 minutes before any load is applied. Surface preparation is crucial, and Sika® ADPrep is recommended for optimal adhesion.

Adhesion and Chemical Resistance
Adhesion tests show varying lap-shear strengths across different substrates, such as aluminium, steel, and glass. The adhesive's mechanical properties are temperature-dependent, and preliminary tests are recommended for specific applications. For chemical resistance advice, contact Sika's Technical Service Department.

Method of Application and Removal
Surfaces must be clean and free from contaminants. The adhesive should be applied with a bond line thickness not exceeding 3 mm to prevent excessive heat generation. Excess material can be removed before curing with a dry wipe, while cured material requires mechanical removal.

Packaging and Safety
SikaFast®-5221 is available in various packaging sizes, including pails and dual cartridges. Users should refer to Material Safety Data Sheets for detailed safety information regarding handling and disposal.

Important Notes
The information provided is based on Sika's current knowledge and experience. However, due to varying materials and conditions, no warranty is implied. Users should consult the most recent Technical Data Sheet for the product.

Catalog excerpts

Technical Data Sheet Version 09 / 2005 SikaFast®-5221 Fast curing 2-C structural adhesive (open time: 9 min.) Technical Product Data Component A Component B SikaFast®-5221 SikaFast®-5200 Chemical base 2-Component ADP Acrylic 1) White Black Colour (CQP 001-1) Colour mixed Grey Cure mechanism Polymerisation Density (uncured) (CQP006-4) 1,14 g/cm3 approx. 1,46 g/cm3 approx. Mixing Ratio by volume 10 : 1 by weight 10 : 1,28 Consistency Thixotropic paste Application temperature 10° - 40°C (50°- 105°F) Open time2) (CQP526-1), (static mixer) 9 min. approx. 2) Curing speed (CQP546-1 / ISO 4587) (see diagram 1 ) Shore hardness A (CQP023-1 / ISO 868) 90 approx. Shore hardness D 50 approx. 2) Tensile strength (CQP036-1 / ISO 527) 10 N/mm2 approx. 2) Elongation at break (CQP036-1 / ISO 527) 150% approx. Tensile-shear strength2) (CQP546-1 / ISO 4587) 8 N/mm2 approx. Glass transition temperature (CQP509-1 / ISO 4663) 50°C approx. 13 Electrical resistance (CQP079-2 / ASTM D 257-99) 1,6 x 10 Ω cm approx. Service temperature (CQP513-1) permanent -40° to + 80°C Shelf life and storage3) (CQP016-1) cartridge 9 months pail 12 months 9 months 1) CQP = Corporate Quality Procedures Description SikaFast®-5221 is a fast curing, flexible 2-component adhesive system. It is based on ADP, Sika’s polymer technology, derived from the acrylic chemistry. Uncured SikaFast®-5221 is a pasty, non-sagging, non-flammable material which allows an easy and precise application. ® SikaFast -5221 is manufactured in accordance with ISO 9001 / 14001 quality assurance system and with the responsible care program. Product Benefits - Strength development within minutes after application - Adhesion to a wide range of metals and plastics with no or only limited substrate preparation - High strength - Gap filling, allowing for manufacturing tolerances (up to 3 mm) - Flexible - Vibration damping - Solvent and acid free - Easy mixing - Low odour - Approved Wheelmark and NSF R2 (incidental food contact) Stored at temperature below 25°C (77°F) and not exposed to direct sun light Areas of Application The ADP technology offers a new generation of fast curing, flexible adhesives designed to substitute welding, riveting, clinching and other mechanical fastening techniques. SikaFast®-5221 is suitable for high strength fastening of concealed joints on different types of substrates including top coats, plastics, glass etc.

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Diagram: Open time and curing speed for SikaFast®-5221 Chemical Resistance For advice contact the Technical Service Department of Sika Industry. Adhesion results The following table summarises lap-shear test results obtained with different substrates. These results are indications. Due to the diversity of substrates, preliminary tests are recommended. Be aware that the mechanical properties are temperature depending (values on request). Adhesion table Material Aluminium Al Mg3 Steel St 32 Stainless steel Galvanised steel Float glass UP-FRP ABS (Terulan) PVC ( Köradur ES) Polycarbonate Lap shear...

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SikaFast®-5221

SikaFast®-5221

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