HS Butyl 0421 is a preformed butyl tape designed to create a permanent, flexible seal for caisson rings, box culverts, and manhole sections in accordance with BS EN 1917. It is easy to use, maintains flexibility, and does not shrink over time, ensuring a reliable seal in various construction and infrastructure applications.

Product Type: Tape

Application Area: Box Culverts, Lap Joints, Manholes

Features: Ease Of Use, Excellent Multi-Substrate Adhesion, Flexible, No Shrinkage

Technical Data Sheet
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Enhanced TDS

Identification & Functionality

Features & Benefits

Labeling Claims
Ready-to-Use Product Features
Product Features
  • Bitumen-free.
  • Easy to use with good adhesion to most building substrates.
  • Permanently flexible.
  • Non-shrinking.

Applications & Uses

Markets
Applications
Application Area
Application Instructions

Surface preparation

  • All surfaces should be clean, dry, and free from frost, grease, and loose materials.

  • When cleaning contaminated substrates, HS Butyl recommends using propan-2-ol (IPA) and allowing it to dry before applying the butyl tape.

Application

  • Apply directly from the reel onto one surface and press along its entire length to ensure good initial adhesion.

  • Overlap the tape ends to ensure a good seal and compress.

  • Remove the backing paper, position the other surface onto the sealant, and push firmly to seal across the joint.

  • Spacers may be inserted into the tape to prevent over-compression.

Product Application

Sealing concrete caisson rings, box culverts, manhole sections.

Properties

Performance Properties
ValueUnitsTest Method / Conditions
Service Temperature Range-40 to +60°C-
Solids Contentmin. 99%-
Application Properties
ValueUnitsTest Method / Conditions
Application Temperature Range5 - 40°C-
Product Tolerance

Rectangular sections:

  • Thickness: ±10%
  • Width: 26mm to 100mm ±2mm

Bead sections:

  • Thickness: ±10%
Chemical Resistance

Acetone, Ammonia, Anti-Freeze, Phenol Solutions 5%, Salt Water, mild acid and alkalis, raw sewerage (typically pH 5.5 to 8)

Regulatory & Compliance

Certifications & Compliance

Packaging & Availability

Packaging Information

HS Butyl 0421 is normally supplied as an extruded strip on a siliconised release paper. A wide range of dimensions can be supplied. Product dimensions will determine the number of rolls per carton.

Storage & Handling

Shelf Life
24 months
Storage Condition

24 months when stored flat in original packaging in cool, dry conditions.