HYDRO-BLOK® Joint Sealant is a polyurethane-based joint sealant used as part of HYDRO-BLOK® waterproofing accessories for sealing seams, joints, and panel connections within shower assemblies. It creates a flexible, watertight bond that supports moisture control in wet-area installations.

The non-sag formulation allows controlled application on vertical and horizontal surfaces, while primerless adhesion supports direct bonding to HYDRO-BLOK® components and compatible construction substrates.

Key Features

• Polyurethane Joint Sealant: Forms a flexible, waterproof seal for seams, joints, and panel connections in shower systems.
• Primerless Adhesion: Bonds directly to HYDRO-BLOK® panels and common construction materials without primer.
• Non-Sag Consistency: Supports clean application on vertical joints and seams.
• Flexible Performance: Elongation of 250% accommodates movement within the assembly.
• Weather-Resistant Formula: Exterior-grade, paintable, and non-yellowing after cure.
• Wide Temperature Tolerance: Applies between 35°F and 110°F with service temperatures from -60°F to 225°F.
• Industry Compliance: Meets ASTM C920 Type S, Grade NS, Class 25, Use NT, M, and A.

Specifications

Specification	Details
Consistency	Non-sag
Skin Time	30–40 minutes
Elongation at Break	250%
Tensile Strength	200 psi
Lap Shear	250 psi
Application Temperature	35°F to 110°F
Service Temperature	-60°F to 225°F
Shelf Life	12 months unopened at 75°F

HYDRO-BLOK® Joint Sealant is a core waterproofing accessory for creating watertight seams and movement-tolerant joints within HYDRO-BLOK® shower system installations.