11
DOWSIL 888 silicone joint sealant sausage for concrete pavement expansion joints, +100% movement capability
DOWSIL 888 silicone joint sealant sausage for concrete pavement expansion joints, +100% movement capability

Dowsil 888 Silicone Joint Sealant

Non-sag, low-modulus silicone for concrete-to-concrete pavement movement joints. Bonds to properly prepared concrete without primer and accommodates high joint movement; not for asphalt contact.

Vendor: Dowsil
SKU: SILDC888/SSG
Availability: In Stock
$19.40
$19.40
Prices do not include GST
Guaranteed safe checkout
  • Apple Pay
  • Google Pay
  • Mastercard
  • Shop Pay
  • Visa
  • Secure SSL encrypted checkout
  • Fast, tracked shipping
  • Easy returns & support
Adheseal tool

Sealant Calculator

Not sure on how much sealant you'll need? Use our calculator to find out.

  • Width + depth presets
  • Instant quantity estimate
Shipping & Delivery

Flat-rate shipping $17.95 + GST (metro and standard zones). Excludes remote/regional/high-cost postcodes and certain items (DG, oversized, long-length, or bagged products 15 kg+). If your order includes any of these, we will contact you to arrange additional freight charges. Online purchases only.

Download Product Data

Download TDS Download SDS
Description  

DOWSIL 888 Silicone Joint Sealant is a non-sag, low-modulus silicone for movement joints in Portland cement concrete pavements. Designed for new roadworks and pavement repairs, it seals joints against water and debris while accommodating the expansion and contraction of concrete slabs.

Where DOWSIL 888 works best

Choose 888 for concrete-to-concrete pavement joints, including joints with uneven widths or minor edge spalling. The non-sag consistency stays in place rather than flowing, making it the appropriate DOWSIL pavement option where a self-levelling sealant is not wanted. It adheres to suitably prepared Portland cement concrete without a primer.

Why choose it?

  • High-movement sealing: accommodates up to +100% extension and -50% compression in properly designed joints.
  • Non-sag application: helps maintain the intended bead profile in pavement joints.
  • Concrete-specific adhesion: bonds to clean, dry and frost-free Portland cement concrete without priming.
  • Outdoor durability: resists weather and UV exposure; short-term incidental fuel exposure is distinct from spill containment.

DOWSIL 888 or 890-SL?

Use DOWSIL 890-SL where a self-levelling sealant is required for horizontal concrete or concrete-to-asphalt pavement joints. DOWSIL 888 is the non-sag choice for concrete joints and should not be selected for contact with asphalt.

Before installation

Joint faces must be clean, dry and frost-free. Specify suitable backing material and joint dimensions to avoid three-sided adhesion. Allow adequate atmospheric moisture for curing, and recess the sealant below the traffic surface in accordance with the applicable joint design. A skin may form in approximately one hour under standard conditions, but this is not full cure or automatic approval to reopen a pavement.

Important limitations

  • Do not use on or against asphalt; select a suitable alternative for mixed pavement joints.
  • Not intended for continuous immersion or chemical/fuel spill containment.
  • Do not install on wet concrete or in unsuitable weather, or within fully enclosed joints that prevent moisture cure.
  • Confirm project requirements and joint design before road or airfield use.
Common Questions  

What is Dowsil 888 used for?
It is designed for concrete-to-concrete pavement joints in new construction and remedial roadworks.

How much movement can Dowsil 888 handle?
It provides +100% extension and -50% compression movement capability to ASTM C 719.

Does Dowsil 888 need a primer on concrete?
It is formulated for unprimed adhesion to clean, dry and frost-free Portland cement concrete.

Can Dowsil 888 be used on asphalt?
No. Do not use it on or in contact with asphalt substrates.

Uses & Benefits  
Cold-applied, non-sag silicone joint sealant for Portland cement concrete pavement joints in new construction and remedial roadworks. Provides +100% extension and -50% compression movement capability to ASTM C 719. Bonds to clean, dry, frost-free Portland cement concrete without primer. Ultra-low-modulus silicone accommodates irregular joint widths and minor concrete spalling while reducing stress at the concrete bond line.
How To Apply  
Use only on clean, dry and frost-free Portland cement concrete. Install a backer rod to control sealant depth and prevent three-sided adhesion. Recess the sealant about 9.53mm to 12.7mm below the pavement surface, or deeper where future grinding is planned. For a 6mm joint, use a 9mm backer rod and 6mm sealant depth. For a 13mm joint, use a 16mm backer rod and 6mm sealant depth. For a 25mm joint, use a 32mm backer rod and 13mm sealant depth. Apply the non-sag sealant continuously so it wets both concrete joint faces.
Limitations and Safety Info  
Not recommended for continuous water immersion. Do not use in totally confined spaces where atmospheric moisture cannot reach the sealant. Do not use on or in contact with asphalt substrates. Do not apply to wet or damp concrete and do not install during inclement weather. Do not use in chemical or fuel spill containment areas. Not tested or represented for medical or pharmaceutical applications.
Suitable Substrates  
  • Portland cement concrete pavement, clean, dry and frost-free.

Dowsil 888 Silicone Joint Sealant Physical Properties

Dowsil 888 Silicone Joint Sealant Physical Properties
Property Value
Form Paste
Sag / Slump Pass (< 0.30 inches)
Extrusion Rate Minimum 72 mL/min
Tack Free Time Pass (5 hours max)
Heat Aging 3.05% loss (max 10% loss)
Shore A Hardness 15 (max 25)
Specific Gravity 1.48
Full Cure 21 days at 25°C, 50% RH
Elongation >= 1000% (min 600%)
Tensile Stress @ 150% 28 psi (max 45 psi)
UV Resistance Pass (5,000 hours)
Resilience 77% (min 75%)
Movement Capability +100% / -50% (10 cycles)
Application Temperature -29 to 49°C
Solubility in Water Insoluble
Flash Point 100°C

Dowsil 888 Silicone Joint Sealant - Use Cases

Here are some common examples on where Dowsil 888 Silicone Joint Sealant used by our customers.

Civil Construction

Concrete Pavement Joint Sealing

Sealing movement joints in new or remedial Portland cement concrete pavements subject to weather and traffic.

Its low-modulus silicone accommodates significant joint movement without primer on concrete, maintaining seal integrity under varying conditions.

  • ASTM D 5893 Type NS
  • +100% / -50% movement capability
  • Unprimed adhesion on concrete
  • -20 to 120°F application range

Alternative Products

Vendor
Example product title
From $19.40
From $19.40
Vendor
Example product title
From $19.40
From $19.40
Vendor
Example product title
From $19.40
From $19.40
Vendor
Example product title
From $19.40
From $19.40
Vendor
Example product title
From $19.40
From $19.40
Vendor
Example product title
From $19.40
From $19.40

Need Help with Dowsil 888 Silicone Joint Sealant?

Need more information about this product? Hit the button below and reach out to one of our experts now.

Get In Contact
Recently Viewed Products