Factory Direct Supply
TY-SHIELD™ JS Waterproof Coating — a professional two-component composite system of organic polymer emulsion and inorganic cement. Engineered for the 'Cement-to-Cement' bonding logic, it eliminates the need for primers before tiling. Our formula adheres to GB/T 23445-2009 standards, offering Type I (Flexible, 1:1.2 ratio), Type II (Balanced, 1:1.5 ratio), and Type III (Rigid, high-adhesion). Specifically designed for damp-base applications, it solves the challenge of waterproofing basements and bathrooms without waiting for complete substrate drying. Direct factory supply in 50kg sets (20kg Liquid + 30kg Powder).
For project-specific pricing, send your technical requirements and destination port.
JS occupies an unusual position in the waterproofing product family. It is half organic polymer emulsion and half inorganic cement powder — mixed on site, troweled onto a wall, and left to cure into something that is neither plastic nor mortar. The cement hydrates like concrete. The polymer coalesces like paint. The result bonds to the substrate not through surface adhesion, but through shared chemistry — cement to cement, no interface to fail.
This is why over 90% of residential bathroom waterproofing in China uses JS. Not because it’s the highest-spec coating available, but because it’s the only one that lets you screed and tile directly on top — eliminating the bonding primer every other polymer coating requires. For bathrooms, kitchens, and wet areas where tiles are the final surface, JS strips a full step out of the construction schedule. Per square meter, material cost runs 40–60% below single-component polyurethane coatings — when you add the eliminated labor step, the installed cost gap widens further.
The Three Types — I, II, and III — are not quality grades. They’re application profiles. See the FAQ section below for a detailed selection guide covering elongation, adhesion, and substrate compatibility for each Type.
Tianyuan manufactures JS coating direct from the production line. Polymer-to-cement ratio, set time, and viscosity are adjustable to your market’s climate and application norms. GB/T 23445-2009 is the baseline national standard. The updated GB/T 23445-2025 (effective July 2026) adds long-term water resistance, accelerated aging, and VOC limits — our production is already aligned. Request the current TDS with your inquiry.
Over 90% of residential bathroom waterproofing in China uses JS. Not because it's the highest-spec coating available — because it's the only one that lets you screed and tile directly on top without a bonding primer. Walls, floors, under shower trays — one JS layer, then tile adhesive, then tiles.
Type II and III handle 0.6 MPa anti-permeability pressure. Non-toxic, water-based formulation is safe for potable water contact. JS holds ≥80% tensile retention after alkali treatment — pool disinfectants and treated water won't degrade the coating.
Once a basement wall is backfilled, a leak costs more to fix than to rebuild — you're excavating. JS bonds to damp concrete at ≥0.7 MPa (Type II), which means it goes on right after formwork is stripped, before the wall has fully cured. You're not waiting for the concrete to dry before you waterproof. That pulls the entire underground construction sequence forward.
Type I's 200% elongation absorbs the thermal expansion and contraction of the roof slab. The JS goes directly on the concrete deck — then insulation, screed, and the waterproof membrane above it. Sunlight never hits this layer. But temperature does — and that's why elasticity matters more than rigidity here.
The polymer emulsion is white to begin with. Add whatever pigment your project needs. Blue for swimming pools — the waterproofing layer doubles as the decorative finish, no separate coating on top. Grey for balconies — matches the floor tile tone, no visible seam at the transition. White for exterior walls — reflects solar radiation, keeps the wall cooler. Color doesn't change performance. It changes which projects you can bid for.
Pour the liquid into the mixing bucket first. Add powder gradually while stirring. Mix for five minutes until lump-free. Now check the consistency — too thin and it'll run down the wall. Too thick and you won't spread it. The trick: for vertical surfaces, use 10–15% less water than the package specifies. The slurry should hold its shape on a trowel like plaster, not drip off like paint.
A basement wall faces groundwater, and groundwater is almost always alkaline — dissolved minerals from soil and rock. Standard polymer coatings soften, blister, and debond in alkaline conditions over months of exposure. GB/T 23445 requires JS to retain ≥80% of its tensile strength and full adhesion grade after alkali treatment. This isn't a nice-to-have. For anything buried underground, it's the minimum survival requirement.
Bathroom corners where the wall meets the floor — on most sites, they're sharp 90-degree angles, not rounded arcs. Coating applied in a sharp corner is naturally thinner. When temperatures drop and the building contracts, rigid coatings crack right at that thin spot. Type I's 200% elongation is there for this exact construction reality — the coating moves with the corner instead of splitting. For cold, dry regions and high-altitude projects where inside corners stay sharp, Type I is the safer choice than Type III.
JS Polymer Cement / Type II / GB/T 23445-2009 (Representative Configuration)
| Test Item | Unit | Test Method | Requirement | Result / Notes |
|---|---|---|---|---|
| Solid Content (all types) | % | GB/T 23445 | ≥ 70 | ≥ 81 |
| Tensile Strength — Type I | MPa | GB/T 23445 | ≥ 1.2 | ≥ 1.9 |
| Tensile Strength — Type II | MPa | GB/T 23445 | ≥ 1.8 | ≥ 1.8 |
| Tensile Strength — Type III | MPa | GB/T 23445 | ≥ 1.8 | ≥ 1.8 |
| Elongation at Break — Type I | % | GB/T 23445 | ≥ 200 | 200+ |
| Elongation at Break — Type II | % | GB/T 23445 | ≥ 80 | 80+ |
| Elongation at Break — Type III | % | GB/T 23445 | ≥ 30 | 30+ |
| Adhesive Strength — Type I | MPa | GB/T 23445 | ≥ 0.5 | ≥ 0.8 |
| Adhesive Strength — Type II | MPa | GB/T 23445 | ≥ 0.7 | ≥ 0.7 |
| Adhesive Strength — Type III | MPa | GB/T 23445 | ≥ 1.0 | ≥ 1.0 |
| Low Temp Flexibility (Type I) | °C, 10mm | GB/T 23445 | -10°C — No crack | No crack |
| Watertightness (all types) | MPa / min | GB/T 23445 | 0.3MPa, 30min | Impervious |
| Anti-Permeability (Type II/III) | MPa | GB/T 23445 | ≥ 0.6 | ≥ 0.6 |
Swipe to view the full table →
Values shown apply to the stated product configuration. Other types (Type I / II / III) and formulations may have different performance values. Request the corresponding TDS and batch test report before specification or procurement.
Scrape off loose material and dust. Wipe away oil and grease. Patch any cracks before coating. Inside corners — if you can radius them, do it. If the corner stays sharp, choose Type I over Type III. For basements, pump out standing water first. The surface can feel damp to the touch — that's fine. It just can't have puddles.
Pour the liquid component into the bucket. Add water per the ratio on the package. Stir briefly, then add the powder slowly while continuing to stir — dumping powder too fast creates lumps that are hard to break. Mix for five minutes until the slurry is uniform, with no dry pockets visible. You've got about two hours to use it after mixing. If it starts thickening, don't add water — it won't help.
Every inside corner, outside corner, pipe root, and drain surround is a potential leak point. Before you do the main area, apply 2–4 thin coats to each of these spots with a small brush, waiting for each coat to dry before the next. If the design calls for it, embed polyester non-woven fabric into the wet coating — press from the center outward with a trowel to squeeze out all air bubbles. The fabric must be fully saturated, with no dry fibers visible.
First coat goes on vertically. Once it's dry to the touch, the second coat goes horizontally. The third coat back to vertical. Four coats minimum, with the alternating pattern ensuring no pinhole gets missed twice. Minimum eight hours between coats — faster in summer, slower in winter. Each coat consumes around 0.8 kg per square meter. Total dry film thickness per specification — bathroom walls at 1.2mm, shower areas and pools at 1.5–2mm.
The liquid component is a polymer emulsion — it freezes and irreversibly breaks below 0°C, so winter shipping requires insulated container loading. Powder is cement-based — keep dry. Standard sizes per client specification. Palletized for container shipment.
Liquid: the emulsion separates if frozen. Powder: cement hardens on contact with moisture — reseal opened bags immediately. Shelf life: 12 months in original unopened packaging under standard conditions.
Your brand on bucket and bag. Polymer-to-cement ratio adjustable — higher polymer content for more flexibility, more cement for higher compressive strength. Set time tunable for climate: faster for hot regions, slower for cold. Send your target specification.
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