Sikacryl-621 Fire is a fire resistant, phthalate-free acrylic sealant for interior joints and penetration sealing in walls and floors. Can be combined with SikaSeal-623 Fire, Sikacryl- 624 Fire, SikaSeal-626 Fire Board, SikaSeal-627 Fire Collar, SikaSeal-628 Fire Wrap and SikaSeal-629 Fire Wrap.

The extremely versatile 1-part product is ready to use and easy to apply, providing acoustic insulation and up to 4 hours fire resistance.

Sika now offer a Fire Stopping Solution Finder - a useful tool when needing assistance on specifying fire stopping solutions.

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• Features & Benefits
• Environmental Information
• Approvals/Standards
• Product Information
• Technical Information
• Application Information
• Application Instructions
• Further Documents
• Limitations

Features & Benefits

• Restores the fire resistance performance of a floor or wall which incorporates penetration services or linear seals
• Extremely versatile
• Can be combined with many other Sika Passive Fire Protection products:
• SikaSeal-626 Fire Board
• SikaSeal-627 Fire Collar
• SikaSeal-628 Fire Wrap
• SikaSeal-629 Fire Wrap
• Provides acoustic insulation
• 1-part ready to use, easy to apply
• Up to 4 hours fire resistance
• Wide service temperature, from −20 °C min. to +70 °C max.
• Available in cartridges or foil packs
• Sika now offer a Fire Stopping Solution Finder - a useful tool when needing assistance on specifying fire stopping solutions

Environmental Information

• Conformity with LEED v4 EQc 2: Low-Emitting Materials
• VOC emission classification GEV-EMICODE EC 1 PLUS

Approvals/Standards

• CE Marking and Declaration of Performance to EN 15651-1 - Sealants for non-structural use in joints in buildings - Facade elements
• CE Marking and Declaration of Performance to European Technical Assessment ETA 18/1051, based on EAD 350141-00-1106:2017 - Fire stopping and fire sealing products, linear joint an gap seals
• CE Marking and Declaration of Performance to European Technical Assessment ETA 18/1052, based on EAD 350454-00-1104:2017 - Fire stopping and fire sealing products, penetration seals
• Fire Protection of Movement Joints BS 476, EN 1366-3, EN 1366-4, Sikacryl-621 Fire, Warringtonfire, Approval No. CF 5718
• Fire Reaction, Flow Resistance, Elongation at Break, Durability tests EN 15651-1, Sikacryl-621, Sika, Test report No. 00002-CS&B-00554-Mri
• Fire Resistance Performance Classification EN 13501-2, Sikacryl-621 Fire, Warringtonfire, Classification report No. 401159/A
• Fire Sealant for Fire Stopping EN 1366-3, EN 1366-4, 13501-2, ETAG 026-2, ETAG 026-3, Sikacryl-621 Fire, UL, Certificate No. UL-EU-01090-CPR
• Certifire
• EN 10140-2
• UL EU

Product Information

Technical Information

Application Information

Resistance to fire of vertical linear joints in rigid and flexible walls sealed with Sikacryl-621 Fire. Movement ± 7.5%. Tested acc. EN 1366-4 and classified acc. EN 13501-2/EAD 350141-00-1106.

* Brickwork, concrete or aerated concrete with a density ≥ 670 kg/m³

** 2 Layers of gypsum board (2 x 1.5 mm on each side)

*** Backed with ≥ 60 kg/³ mineral wool, ≥ 75 mm deep

**** Backed with ≥ 45 kg/³ mineral wool, ≥ 40 mm deep

Resistance to fire of linear joints in floors as well as head of walls (wall thickness ≥ 150 mm) sealed with Sikacryl-621 Fire. Movement ± 7.5%. Tested acc. EN 1366-4 and classified acc. EN 13501-2/EAD 350141-00-1106.

* Brickwork, concrete or aerated concrete with a density ≥ 760 kg/m³

*** Backed with ≥ 60 kg/³ mineral wool, ≥ 75 mm deep

Application Instructions

Substrate Preparation

The substrate must be clean, dry, sound and homogeneous, free from oils, grease, dust and loose or friable particles. Sikacryl-621 Fire adheres without primers and/or activators.

Backing

Sikacryl-621 Fire may adhere to only two sides of the joint in order to perform properly. The bottom surface of the sealant must be free to deform. If the bottom of sealant adheres, the sealant will rupture during deformation. Backing rods are used to avoid adhesion to the joint’s bottom and to limit its depth.

In most cases, closed cell PE backers are used in combination with Sikacryl-621 Fire - for specific cases, refer to the relevant classification reports, ETA’s or similar.

To provide sufficient backpressure during sealant application, the backing rod should be ~25% larger than the joint width. Sizing differs among backing rod types; refer to the manufacturer’s recommendations.

Application Method/Tools

IMPORTANT: The sealant must fill the entire joint or cavity and be in full contact with the joint sides. If the joint is improperly filled, good adhesion will not be achieved, and the joint’s performance will be weakened.

Reference must be made to the Sika Passive Fire Protection Handbook or contact Sika/Rawlins Technical Services for additional information on 0113 2455450 (option 2) or send a message to [email protected] .

Cleaning of Tools

Clean all tools and application equipment with water immediately after use. Hardened material can only be removed mechanically.

Further Documents

• Sika Method Statement: Sikacryl-621 Fire
• Sika Passive Fire Protection Handbook
• Fire resistance classification reports (see "Data Sheets" tab above)

Limitations

• Sikacryl-621 Fire can be overpainted. However, paints must first be tested to ensure compatibility by carrying out preliminary trials (e.g. according to ISO technical paper: Paintability and paint compatibility of Sealants).
• Colour variations may occur due to exposure to chemicals, high temperatures and/or UV-radiation (especially with the colour shade white). However, a change in colour is purely of aesthetic nature and does not adversely influence the technical performance or durability of the product.
• Do not use Sikacryl-621 Fire as a glass sealant, for floor joints, sanitary joints, on natural stone, or for civil engineering applications.
• Do not use Sikacryl-621 Fire on bituminous substrates, natural rubber, EPDM rubber or on any building materials which might leach oils, plasticizers or solvents that could attack the sealant.
• Do not use Sikacryl-621 Fire for joints under water pressure or for permanent water immersion.

IMPORTANT FIRE PRODUCTS NOTICE: The information displayed on this website should be used as a guide ONLY and our Technical Department should be contacted to obtain a tailored specification and any advice necessary before you place an order for fire protection products. Fire protection products are non-returnable except in accordance with Condition 8 of the Terms and Conditions and should be applied only by an individual with the necessary expertise and experience. We will not be held liable for any resulting damage to property, human life or monetary costs incurred due to the incorrect specification you have prepared or use of fire protection products caused by your negligence, including your failure to have contacted us to obtain the relevant advice/specification.