SPACE ARC ENGINEERING · AUTHORIZED DISTRIBUTOR & APPLICATOR · INDIA
Joint Sealants & Treatment Systems in India
Joint sealants are the flexible barrier that keeps water, air, dust and noise out of the gaps designed into every building and structure. Because concrete, masonry, glass and metal expand, contract and deflect, sealed movement joints are not optional details, they are what determines whether a facade, podium, water tank or car park stays watertight over its service life. The right system depends on chemistry, expected joint movement, substrate, exposure and whether the joint is trafficked, immersed or fire-rated. This hub brings together the major sealant technologies, polyurethane, silicone, polysulphide and modern hybrid (MS polymer) sealants, along with joint design, backer rods and fire-stopping, so specifiers and contractors can choose by performance rather than by brand. Space Arc Engineering supplies sealants and joint-treatment products from Sika (Sikaflex, Sikasil), Fosroc (Nitoseal, Thioflex) and Dr. Fixit, as an authorized project distributor and applicator across India. Beyond supply, our team helps with joint design, sealant selection, primer and backer-rod compatibility, and trained applicator services for facades, expansion joints and waterproofing details, so the specified system performs exactly as intended on site.
Sealant technologies: polyurethane, silicone, polysulphide and hybrid
Each sealant chemistry has a sweet spot. Polyurethane sealants (such as Sika Sikaflex-1A and Fosroc Nitoseal PU range) are tough, abrasion-resistant and paintable, making them the workhorse for expansion and connection joints in concrete, masonry and floors. Silicone sealants (Sikasil WS series) offer outstanding UV stability and movement capability and are the default for glazing, curtain-wall weatherseals and glass-to-metal interfaces, though they are generally not paintable or trafficable. Polysulphide sealants (Fosroc Thioflex 600) cure to a rubber-like seal with excellent chemical and fuel resistance, traditionally specified for trafficked floor joints, fuel-exposed areas and civil structures. Hybrid / MS-polymer sealants (for example Nitoseal MS600) combine low-VOC, primerless adhesion to many substrates with good weathering, bridging the gap between PU and silicone. Choosing the correct technology first, then the grade, is the single biggest driver of long-term joint performance.
Key selection criteria: movement, substrate, exposure and traffic
Specify sealants against the joint’s actual demands, not just its width. Movement accommodation factor (MAF), the percentage of joint width a sealant can cyclically absorb, must exceed the calculated thermal and structural movement; products are rated roughly from +/-25% up to +/-50% and beyond. Substrate matters: porous concrete and masonry usually need a primer, while many MS hybrids bond primerless. Exposure dictates UV and chemical resistance, weathersealed facades favour silicones, immersed and below-grade joints favour PU or polysulphide. Traffic and point loading rule out soft silicones in favour of tough PU or polysulphide floor-grade products. Also confirm sag vs self-levelling grade (vertical joints need non-sag; horizontal floor joints often use pourable/self-levelling), cure speed, service temperature, and whether a fire rating is required. Correct joint geometry, the right width-to-depth ratio set by a backer rod or bond-breaker tape, is just as important as the sealant itself.
Application contexts across building and infrastructure
Sealant and joint-treatment systems appear across almost every project type. On facades and glazing, weatherseal and structural glazing silicones close the gaps in curtain walls, ACP and stone cladding. In water-retaining structures, basements and STPs, PU and polysulphide sealants treat construction and movement joints alongside waterstops and waterproofing membranes. In car parks, podiums and industrial floors, trafficable PU or polysulphide sealants handle saw-cut and expansion joints under wheel loads. In precast and panel construction, low-modulus PU and hybrids seal panel-to-panel joints. And throughout fire-compartmented buildings, fire-rated sealants and joint systems maintain the fire and smoke barrier where services and joints penetrate rated walls and floors. Space Arc supplies and applies the matching products from Sika, Fosroc and Dr. Fixit for each of these contexts nationwide.
Common joint problems these systems solve
Most sealant failures trace back to a handful of avoidable causes: adhesion loss from skipped or wrong primers, cohesive splitting when movement exceeds the sealant’s MAF, three-sided adhesion from a missing backer rod, and premature chalking or cracking from using the wrong chemistry for the exposure. Correctly specified joint-treatment systems solve these by pairing the right sealant with the right primer, the right backer rod (typically a closed-cell or open-cell polyethylene foam rod sized to set joint depth) and a sound joint design. They stop water ingress at expansion and construction joints, prevent dust and draughts, absorb thermal and seismic movement without tearing, and, where fire-rated systems are used, restore the fire and smoke compartmentation. Getting the detail right the first time is far cheaper than re-cutting and re-sealing failed joints later, which is why Space Arc pairs product supply with applicator guidance.
How to Choose — Quick Selection Guide
| If you need… | Recommended approach |
|---|---|
| Glazing, curtain-wall or ACP weatherseal joints exposed to UV | Specify a neutral-cure silicone such as the Sikasil WS range for high movement and long-term UV stability; avoid PU here as it chalks under sun. |
| Trafficked or fuel-exposed floor joints (car parks, workshops, civil floors) | Use a tough polysulphide like Fosroc Thioflex 600 (gun or pouring grade) or a floor-grade polyurethane for abrasion and chemical resistance. |
| General expansion / connection joints in concrete and masonry that need painting | Choose a one-part polyurethane such as Sika Sikaflex-1A or the Fosroc Nitoseal PU range, which is paintable, durable and bonds well after priming. |
| Low-VOC, multi-substrate joints where primerless adhesion is preferred | Consider an MS-polymer hybrid like Fosroc Nitoseal MS600 for good weathering and bonding to mixed substrates with minimal priming. |
| Horizontal floor or deck joints requiring a pourable seal | Use a self-levelling / pouring-grade sealant (e.g. Thioflex 600 pouring grade or a self-levelling PU); use non-sag grades for vertical and overhead joints. |
| High-movement structural or seismic movement joints | Select a high-movement-capability sealant (around +/-50%) or a dedicated movement-joint system, and set the correct width-to-depth ratio with a backer rod. |
| Joints penetrating fire-rated walls and floors | Use a tested fire-rated sealant or joint system that maintains the wall/floor fire rating; do not substitute a standard weatherproofing sealant. |
Products Available from Space Arc Engineering
Sika
- Sika Boom
- Sika MultiSeal AP
- Sika MultiSeal T
- Sika Polysulphide Gun Grade
- Sika Polysulphide, Pour Grade
- Sika Primer-3
- SikaBond-124 Instant Nails
- Sikaflex Construction+
- Sikaflex PRO-3
- Sikaflex-11 FC+
- Sikaflex-118 Extreme Grab
- Sikaflex-127
- Sikaflex-400 Fire
- SikaSeal-106 Construction
- SikaSeal-623 Fire+
- Sikasil MultiPlus/-T
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Frequently Asked Questions
Which joint sealant is best for exterior expansion joints in India?
For most exterior concrete and masonry expansion joints, a one-part polyurethane such as Sika Sikaflex-1A or the Fosroc Nitoseal PU range is the practical choice, it is durable, paintable and absorbs thermal movement well after priming. For UV-exposed glazing and curtain-wall weatherseals, a neutral-cure silicone (Sikasil WS) is better. Share the joint width, movement and exposure with Space Arc on +91 9999155255 and we will recommend the exact grade.
What is the difference between polyurethane, silicone and polysulphide sealants?
Polyurethane is tough, paintable and trafficable, ideal for floors and general movement joints. Silicone has the best UV resistance and movement capability for glazing and weatherseals but is not paintable or trafficable. Polysulphide cures to a chemical- and fuel-resistant rubber-like seal favoured for trafficked and fuel-exposed floor joints. MS-polymer hybrids combine low-VOC, primerless bonding with good weathering. The right choice depends on exposure, movement and whether the joint is walked or driven on.
Do I need a primer and backer rod with joint sealants?
Usually yes. Porous substrates like concrete and masonry generally need the manufacturer’s primer for reliable adhesion, while many MS hybrids bond primerless. A backer rod (closed- or open-cell polyethylene foam) sets the correct joint depth, prevents three-sided adhesion and lets the sealant move freely. Skipping either is one of the most common causes of premature sealant failure. Space Arc supplies compatible primers and backer rods alongside the sealant.
What does movement capability (e.g. +/-25% or +/-50%) mean for sealant selection?
It is the percentage of the joint’s designed width that the cured sealant can repeatedly stretch and compress without failing. You calculate the joint’s expected thermal and structural movement, then pick a sealant whose movement accommodation factor comfortably exceeds it. High-movement and seismic joints need around +/-50% capability, while many standard joints are fine with +/-25%. Correct joint width-to-depth geometry is essential to achieve the rated movement.
Which sealant should I use for water tanks, basements and STPs?
For water-retaining and below-grade structures, polyurethane and polysulphide sealants are typically specified for construction and movement joints because they tolerate immersion and resist water ingress. They are usually combined with waterstops and a waterproofing membrane system as part of the overall joint treatment. Space Arc can supply the matching Sika, Fosroc or Dr. Fixit products and advise on the full detail, contact info@space-arc.com.
Are Space Arc an authorized distributor for Sika, Fosroc and Dr. Fixit sealants in India?
Yes. Space Arc Engineering is an authorized project distributor and applicator supplying Sika (Sikaflex, Sikasil), Fosroc (Nitoseal, Thioflex) and Dr. Fixit sealants and joint-treatment products across India. Buying through an authorized distributor means genuine, batch-traceable material, correct storage, technical selection support and access to trained applicators. Reach us on +91 9999155255 or info@space-arc.com.
What is the price of joint sealants in India?
Sealant pricing depends on chemistry (silicone, PU, polysulphide or hybrid), pack size (cartridge, sausage or bulk), grade and project quantity, so it is quoted per project rather than fixed. Space Arc offers competitive, authorized-distributor pricing across Sika, Fosroc and Dr. Fixit. Send your joint details and quantities to +91 9999155255 or info@space-arc.com for a current quotation.
Can Space Arc help with joint design and sealant application, not just supply?
Yes. As an authorized applicator, Space Arc provides technical support on joint design, sealant and primer selection, backer-rod sizing and substrate preparation, plus trained applicator services for facades, expansion joints, floor joints and waterproofing details. This ensures the specified system is installed correctly and performs as intended. Call +91 9999155255 to discuss your project.
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Authorized Project Distributor & Applicator for India’s leading construction-chemical brands. Get product selection help, quotes and applicator support.
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