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Luban Waterproof-Product Introduction | Ludu JS Polymer Cement Waterproof Coating

Company News 16 Oct,2026

Product Description

Ludu JS Polymer-Cement Waterproof Coating is a two-component composite waterproofing material composed of high-grade modified acrylic emulsion (liquid part) and an inorganic powder component. It combines the high elasticity of organic polymers with the excellent long-term durability of inorganic cement-based materials. Depending on the intended application range, it is available in Type I and Type II grades to suit different project scenarios.

Recommended Applications

Suitable for residential and commercial waterproofing projects, including roofs, swimming pools, underground structures, kitchens, bathrooms, corridors and dams. The product is also suitable for projects involving potable (drinking) water contact.

Packaging

Liquid component: sealed and packed in plastic drums (25 kg / 50 kg per drum).

Powder component: sealed and packed in plastic bags (25 kg per bag).

Coverage Reference

Under normal conditions, a finished waterproof coating thickness of 1.0 mm requires approximately 2.2 kg per square metre. Actual consumption depends on the substrate condition and the target coating thickness.

Key Benefits

Water-based coating - non-toxic, non-hazardous, non-polluting and environmentally friendly.

High tensile strength cured film with excellent resistance to water and weathering.

Can be applied onto damp substrates and bonds firmly to the base surface.

Easy to apply, helping to shorten construction schedules.

Application Instructions

1. Substrate Preparation

The substrate must be solid, flat, clean and free of standing water, dust and grease. Flat surface junctions and internal/external (yin and yang) corners should be finished into smooth, even, rounded transitions with an arc radius of no less than 50 mm.

2. Mixing Procedure

Weigh the liquid and powder components accurately according to the specified mixing ratio and stir evenly. Prepare only the amount that can be used within the working (pot) life. Mixed coating material must be used up within 30 minutes.

3. Detail Node Reinforcement

Detail nodes require an additional reinforcement layer. Method: lay the additional fabric first and the coating on top, using polyester non-woven fabric of 30-50 g/m².

4. Large-Area Application

The coating can be applied by roller brushing or mechanical spraying. Apply the coating in layers, making sure it is even. Wait until the previous coat has dried to a film (touch-dry, not sticking to the hand) before applying the next. Change the coating direction alternately for each layer. For the same layer, the lap width between successive passes of the coating film should be 30-50 mm.

Important Notes

Do not carry out construction in a closed space without ventilation, as this will affect film formation.

Type I and Type II products must not be mixed together.

Transportation & Storage

This product is non-flammable and non-explosive and can be transported as general cargo. During transport, protect it from rain, direct sunlight and freezing, avoid squeezing and impact, and keep the packaging intact.

Store the product in a dry, ventilated and cool place. The storage temperature of the liquid component should not be lower than 5 ℃. Under normal storage and transport conditions, the shelf life of the sealed package is 6 months.

Technical Specifications

Compliant with GB/T 23445-2009, Polymer-Modified Cement Compounds for Waterproofing Membrane (JS).

No.	Item	Condition	Type I	Type II	Type III
1	Solid content / % ≥	-	70	70	70
2	Tensile strength	Original condition / MPa ≥	1.2	1.8	1.8
		Heat-treatment retention / % ≥	80	80	80
		Alkali-treatment retention / % ≥	60	70	70
		Water-immersion retention / % ≥	60	70	70
		UV-treatment retention / % ≥	80	-	-
3	Elongation at break	Original condition / % ≥	200	80	30
		After heat treatment / % ≥	150	65	20
		After alkali treatment / % ≥	150	65	20
		After water immersion / % ≥	150	65	20
		After UV treatment / % ≥	150	-	-
4	Low-temperature flexibility	-10 ℃, no cracking	-	-	-
5	Bonding strength	Original condition / MPa ≥	0.5	0.7	1.0
		On damp substrate / MPa ≥	0.5	0.7	1.0
		After alkali treatment / MPa ≥	0.5	0.7	1.0
		After water immersion / MPa ≥	0.5	0.7	1.0
6	Impermeability (0.3 MPa, 30 min)	Impermeable	Impermeable	Impermeable	Impermeable

Our Manufacturing & Custom Service

✅ Chinese direct waterproof material factory We own complete production lines. Short lead time, competitive exfactory price.

✅ OEM / ODM & Private Label Available

· Custom physical dimension: thickness, roll length & width

· Custom surface film: PE, PET, aluminum foil etc.

· Private label: print your brand logo, custom carton & roll packaging

· Formula tuning for special climate requirement (high-temperature / cold-region grade)

✅ Whole-project support We serve international distributors, importers, building contractors and engineering companies. Send us your technical requirement or sample specification, our sales-engineering team will offer professional quotation and solution.

Contact us today for wholesale & custom manufacturing inquiry!

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