Hydrocor Corkjoint Type 106: Technical Details, Specifications, and Features

Product Description

Hydrocor Corkjoint Type 106 is a self-expanding cork joint filler manufactured by Fosroc and distributed by Parchem Construction Supplies Pty Ltd. It is engineered as a joint filler and sealer made from cork granules bound together with insoluble synthetic resin and reinforced with fibres to increase constraint and extrusion control.

The product expands when exposed to moisture and provides the necessary semi-rigid, void-free backing for elastomeric sealants subject to hydrostatic pressures. Notably, Hydrocor Corkjoint Type 106 expands to fill and seal joints and does not necessarily require additional joint sealants in some applications.

Key Advantages

• Hydrostatic Pressure Support: Supports sealants subject to hydrostatic pressure in water-retaining structures
• Fibre Reinforcement: Fibre-reinforced formulation prevents extrusion under pressure
• Lightweight and Manageable: Light weight and easy to handle
• Resilient and Waterproof: Maintains resilience and provides waterproof protection
• Self-Expanding: Expands to fill and seal joints effectively

Standards Compliance

Hydrocor Corkjoint Type 106 meets ASTM D1752 - Type 3 standards specification, ensuring consistency with international performance criteria.

Technical Properties

The following table summarizes the key performance properties:

Property	Specification
Form	Compressible sheet, resin bonded cork
Load required to compress to 50%	1 - 2 MPa
Recovery	Greater than 90%; less than 6 mm residual compression (under test conditions after 50% compression)
Extrusion at 50% compression	Less than 1 mm in use
Expansion in boiling water (1 hour)	40% minimum
Expansion in cold water (72 hours)	24% minimum

Material Composition

• Cork Granules: Primary material component providing the base structure
• Synthetic Resin: Insoluble resin binding cork granules together
• Fibres: Reinforcement materials incorporated to increase constraint and prevent extrusion

Supply and Sizing

Hydrocor Corkjoint Type 106 is made to order with flexible dimensions:

• Widths: 50 mm to 610 mm
• Thicknesses: 12 mm, 15 mm, and 20 mm
• Standard Length: 915 mm
• Measurement: Sold by square meter (m²)

Applications and Design Criteria

Water Retaining Structures

Hydrocor Corkjoint Type 106 provides semi-rigid backing essential to joint sealing systems in:

• Dams
• Reservoirs
• Culverts
• Canals
• Sea walls
• Water treatment structures
• Water storage structures

Used in conjunction with suitable joint sealers.

Internal and External Traffic Areas

The product provides necessary support for joint sealants subject to pedestrian or wheeled traffic. Where traffic loads may be high, it is preferable to recess the joint sealant approximately 2 mm below the surface to avoid direct abrasion.

Water Excluding Structures

Hydrocor Corkjoint Type 106 is suitable for filling expansion joints in:

• Basements
• Subways
• Site slabs

Roads, Bridges, and Carparks

The product fills and supports joints in traffic infrastructure applications subject to vehicular and pedestrian movement.

Application Instructions

Preparation and Installation

• Do not remove waterproof wrapping from the product until immediately prior to fixing
• Hydrocor Corkjoint Type 106 must be fixed against one section of concrete after shutter removal
• Fixed in place by bonding to concrete using construction adhesive
• The next section of concrete is then poured directly against the filler with minimal delays
• After initial concrete cure, the top section is removed by power grinder or saw to form a sealing slot of required dimensions

Alternative Installation Method

To avoid the cutting or grinding step:

• Initially place Hydrocor Corkjoint Type 106 below the concrete surface at the depth of the required sealing slot
• Place another section of filler, timber, or polystyrene foam above the fixed filler, reaching to the concrete surface
• This unattached top section is easily removed once concrete has cured

Bond Breaker Tape Application

Fosroc Bond Breaker Tape must be applied over Hydrocor Corkjoint Type 106 prior to application of the joint sealant. Refer to individual sealant Technical Data Sheets for details.

Storage Requirements

• Store in original packaging
• Keep in cool, dry conditions to maintain product integrity
• Ensure proper packaging protection to prevent moisture exposure before installation

Limitations and Considerations

Concrete Staining

Hydrocor Corkjoint Type 106 may cause staining of surrounding concrete in damp conditions, especially on:

• Light-coloured concrete
• Exposed aggregate finishes produced by high pressure hosing

Staining usually disappears after 6-8 weeks of normal weathering.

Alternative for Staining Concerns

Fosroc Hydrocell, a non-staining polyethylene foam filler, may be more suitable in applications where concrete staining is a concern.

Safety and Documentation

• A Safety Data Sheet (SDS) is available from the Fosroc website
• Read both the SDS and Technical Data Sheet (TDS) carefully prior to use
• Application or performance data may change over time; consult the most current documentation
• In emergencies, contact a Poisons Information Centre (phone 13 11 26 within Australia) or a doctor

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References

• [1] Fosroc_Hydrocor_Corkjoint_Type_106_TDS.pdf
• [2] Fosroc_Hydrocor_Corkjoint_Type_3_TDS.pdf