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ROOFEX-SEAL PS
- Water tank expansion joint leak
- Fuel-exposed floor joints
- Road and highway joints
- Building expansion joint sealing
ROOFEX-SEAL PS is a two-component polysulphide liquid polymer sealant, available in Gun Grade (non-sag) and Pour Grade (self-levelling). When mixed, the base and curing agent react to form a firm, flexible rubber-like seal with excellent adhesion to concrete, masonry, wood, glass, acrylic and PVC. Capable of withstanding repeated expansion, contraction and cyclic movement without loss of adhesion — with 30% movement accommodation on butt joints, 50% on lap joints, and a stated service life of 20 years or more. Service temperature: -40°C to +80°C. Compliant with ASTM C-920-87, DIN-18549, TT-S-00227E and BS-4254-83. CPWD and government infrastructure approved.
Specifications
Figures are controlled laboratory results. Actual site performance varies with substrate, temperature, humidity, application method and workmanship — please confirm the current product datasheet before specification.
Where to use ROOFEX-SEAL PS: polysulphide sealant for tanks, roads and fuel areas
ROOFEX-SEAL PS is a polysulphide sealant made of two components, a base and a curing agent, that react to form a firm, flexible rubber-like seal. Gun Grade is non-sag and applied with a caulking gun. Pour Grade is self-levelling and poured into horizontal joints. It withstands repeated expansion, contraction and cyclic movement without loss of adhesion.
Expansion Joints in Buildings
Accommodates 30% movement on butt joints and 50% on lap joints.
Roads & Highways
Resists petrol, diesel, jet fuel and vegetable oils.
Potable Water Retaining Structures
Use the correct primer on concrete before sealing the joint.
Internal Structural Seals
Cures in 7 days at 20°C to a firm, flexible seal.
Horizontal Floor Joints (Pour Grade)
Pour Grade self-levels in the joint, so no tooling is required.
Vertical & Ceiling Joints (Gun Grade)
Gun Grade is non-sag and applied with a caulking gun.
Petrochemical & Fuel-Exposed Joints
Chemical resistance covers alkalis, dilute acids, solvents and fuels.
For a water tank expansion joint leak or similar moving joint, ROOFEX-SEAL PS handles joint widths of 6–25 mm in a single application and up to 50 mm in multiple applications. Service temperature is -40°C to +80°C, with a stated service life of 20 years or more when correctly applied. As a fuel resistant joint sealant it complies with ASTM C-920-87, DIN-18549, TT-S-00227E and BS-4254-83. Keep width to depth at 2:1 on butt joints and 1:1 on lap or floor joints, and prime first.
Armstrong Chemicals supplies ROOFEX-SEAL PS to sites across Telangana, Andhra Pradesh, Karnataka, Kerala and Tamil Nadu, including Hyderabad, Vijayawada, Bengaluru, Kochi and Chennai.
20 Years + Service Life. Gun Grade or Pour Grade.
A two-component polysulphide sealant with 30% butt-joint and 50% lap-joint movement accommodation, -40°C to +80°C service range, and a stated 20-year plus service life — available in non-sag gun grade for all orientations and self-levelling pour grade for horizontal joints.
Get a QuoteWhy Standard Expansion Joint Fillers Fail Over Time
Bitumen, mastics and metallic channel expansion sheets cannot handle repeated cyclic movement without cracking, losing adhesion or deteriorating under UV, fuel or chemical exposure. Most require maintenance within 5–10 years.
The ROOFEX-SEAL PS Advantage
A polysulphide rubber-like seal that withstands repeated expansion, contraction and cyclic movement without loss of adhesion — resistant to UV, ozone, water, salt, oils, fuels and most solvents. Stated service life: 20 years or more.
Self-Levelling Pour Grade
The Pour Grade flows under gravity into horizontal joints and self-levels without tooling — eliminating the skilled labour requirement of gun-applied sealants for floor joint applications, and ensuring complete, void-free joint filling.
Petrol, Diesel & Jet Fuel Resistant
Chemical resistance to petrol, diesel, jet fuel and many solvents — specifically relevant for highways, airport aprons, petrochemical plants and fuel-handling facilities where standard PU and cement-based sealants are not rated.
Trusted on India's Toughest Infrastructure
Gun Grade vs Pour Grade
Gun Grade (Non-Sag)
For horizontal, vertical and ceiling joints — applied by caulking gun.
| Applications | Horizontal, vertical and ceiling joints |
| Method | Caulking gun |
| Joint width | 6–25mm (single); up to 50mm (multiple) |
| Movement | 30% butt joints; 50% lap joints |
| Colours | Grey (standard); Black and Mahogany (special order) |
Built to Last the Life of the Structure
Two grades, four standards, 20-year service life — for expansion joints that move, corrode and see chemicals.
20 Years + Service Life
Anticipated service life is 20 years or more when correctly applied. Withstands repeated expansion, contraction and cyclic movement without loss of adhesion — outperforming bitumen, mastics and metallic channel expansion sheets.
-40°C to +80°C Service Range
The widest service temperature range of any Armstrong sealant — from sub-zero infrastructure applications to high-temperature industrial environments.
4 International Standards
Compliant with ASTM C-920-87, DIN-18549, TT-S-00227E and BS-4254-83 — certified across US, German, American Federal and British specifications simultaneously.
Self-Levelling Pour Grade
The only Armstrong sealant with a self-levelling pour grade — for horizontal joint applications where gravity fills and levels the sealant without tooling or skilled gun application.
Joint Design Reference
Sizing formula and width limits for specifying engineers.
| Parameter | Butt Joints | Lap / Floor Joints |
|---|---|---|
| Movement accommodation | 30% | 50% (shear) |
| Width : Depth ratio | 2:1 | 1:1 |
| Design width formula | Movement × 4.33 | Movement × 2 |
| Min width — porous | 10mm | 12mm (floors) |
| Min width — non-porous | 6mm | 12mm (floors) |
| Max width — single application | 25mm | 25mm |
| Max width — multiple application | 50mm | 50mm |
Primer Reference
Match the correct primer to the substrate before applying ROOFEX-SEAL PS.
| Primer Type | Suitable for |
|---|---|
| Porous Primer | Brick, concrete, natural stone, stained timber frame, glazed tile (unglazed edge) |
| Non-Porous Primer | Stainless steel, glass, glazed tile (face) |
Not compatible with either primer: PPC aluminium/steel, lead, galvanised steel, GR cement, mill-finished or anodised aluminium, PVC-U.
How to Use
Determine joint type (butt or lap/floor) and expected movement
Calculate design joint width using the formula: butt joints = expected movement × 4.33; lap joints = expected movement × 2
Confirm substrate type — check primer compatibility; do NOT use on PPC aluminium, lead, galvanised steel, anodised aluminium or PVC-U
Apply the correct primer: porous primer for concrete/brick/stone/timber; non-porous primer for steel/glass/glazed tile face
Allow primer to cure fully before applying ROOFEX-SEAL PS
For Gun Grade: apply with a caulking gun to horizontal, vertical or ceiling joints
For Pour Grade: pour the mixed sealant into horizontal joints — self-levelling, no tooling required
Full cure: 7 days at 20°C
Paintable after cure — note that excessive joint movement may crack the paint and could induce tears in the sealant
Contact Armstrong technical support for site-specific mixing ratios and application method guidance
Applicable Areas
Packing & Primer Coverage
Available in 1 Kg, 4 Kg and 2.5 Litre packs. No shelf life figure is stated in this brochure — confirm with Armstrong before ordering stock for long-term storage. Primer coverage: 25 metres per 250ml tin (porous and non-porous primers).
Health Classification & Substrate Limits
Pour Grade Base is labelled "Irritant"; Pour Grade Curing Agent is labelled "Harmful". Gun Grade curing agent contains Manganese Dioxide. Handle per material safety data sheet. Not compatible with: PPC aluminium/steel, lead, galvanised steel, GR cement, mill-finished or anodised aluminium, PVC-U.
Gun Grade vs Pour Grade
Gun Grade (non-sag): horizontal, vertical and ceiling joints — applied by caulking gun. Pour Grade (self-levelling): horizontal joints only — poured and self-levels without tooling. Also see ROOFEXSEAL PU 212 for the polyurethane alternative. Confirm grade selection before ordering.
Product Brochure
Download Technical Datasheet
Full specifications, application systems, layering guides, and coverage tables.
Frequently Asked Questions
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