NWJ122 Polyester-Reinforced Self-Adhesive Polymer-Modified Bitumen Waterproofing Membrane

This product is a self-adhesive polymer-modified asphalt waterproofing membrane formulated with a base of polymer-modified asphalt—composed of synthetic rubbers such as SBS and SBR, tackifying resins, and high-quality petroleum asphalt—with a polyester felt backing and a release liner on the surface.

产 品 结 构

产 Product Categories

Based on the top surface material, they are classified as polyethylene film (PE), fine sand (S), and double-sided self-adhesive without film (D).

Based on performance, they are classified as Type I and Type I-II; the 2.0 mm thick PY grade is available only in Type I.

 Specifications and Dimensions

Thickness: 2.0 mm, 3.0 mm, 4.0 mm;

Width: 1000 mm;

Nominal area: 15 m², 20 m².

Label in the following order: product name, type, top surface material, thickness, area, and standard number.

Example: A self-adhesive polymer-modified bitumen waterproofing membrane with a 10 m² area, 3.0 mm thick polyethylene film, and Type I polyester felt backing is labeled as: Self-adhesive Membrane PY I PE 3.010 GB 23441-2009

• Strong bonding strength, good “self-healing” properties, and excellent adhesion to the substrate;
• High strength, high elongation, and high elasticity, capable of withstanding general deformation and cracking in the substrate;
• Long service life, excellent weather resistance, and the ability to withstand climatic changes in both hot and cold regions;
• Cold application—safe, reliable, and pollution-free.

施 Engineering Methods

Depending on the specific conditions of the project, either the pre-laid method or the dry-laid method may be used.

• Loose-lay Method: Lay the membrane loosely on the substrate with the self-adhesive side facing up. Peel off the top release liner, then pour concrete to ensure the membrane’s self-adhesive side bonds firmly to the concrete, creating a watertight membrane.

Key Points for the Pre-lay Method

◎The substrate should be level, firm, and free of standing water; all protrusions must be completely removed;

◎The facade is mechanically fastened at 500-mm intervals;

• Dry-Lay Method: On a dry, level, and dust-free substrate, first apply a primer. Once dry, peel off the release film from the self-adhesive side of the roll material and adhere it directly to the substrate. Key Points for the Dry-Lay Method

◎Before laying the membrane, apply a primer evenly to the substrate surface; once dry, lay the membrane promptly;

◎When installing the membrane, completely remove the release film from the underside of the membrane; ensure all air is completely removed from beneath the membrane, and roll it firmly to ensure a secure bond; the installed membrane should be flat and straight, with accurate lap dimensions, and must not be twisted. Hot air may be used to assist with installation at the overlaps; after heating with hot air, the membrane should be firmly adhered immediately.

Suitable for waterproofing applications in industrial and residential buildings, including roofs, basements, interiors, tunnels, subways, and municipal projects.

Suitable for waterproofing roofs with special structures, such as wooden roofs.

It is particularly suitable for waterproofing projects at oil depots, chemical plants, textile mills, and other facilities where open-flame work is not permitted.

包 Packaging, Storage, and Transportation

• Packaging: Sealed in special packaging film.
• Storage: Products of different types and specifications should be stored separately and must not be mixed. Protect from direct sunlight and rain, and ensure adequate ventilation. The storage temperature should not exceed 45°C. When stored upright, products should be stacked in a single layer; during transportation, they may be stacked upright in no more than two layers. Under normal storage and transportation conditions, the product has a shelf life of 1 year from the date of manufacture.
• Transportation: Prevent tilting or lateral pressure during transport; cover with a tarpaulin if necessary.

 Performance Metrics

Applicable Standard: GB 23441-2009 "Self-Adhesive Polymer-Modified Bituminous Waterproofing Membranes"