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MASTERBENT® LP bentonite mat — laminated bentomat with polymer additive
BentIzol

MASTERBENT® LP bentonite mat — laminated bentomat with polymer additive

Bentonite waterproofing

Grade LP combines both enhancements of the line: a polymer additive to the sodium bentonite and a laminating polyethylene film. The mat is impermeable, resistant to media with pH from 1 to 13, remains flexible down to −70 °C and withstands hydrostatic pressure up to 7 atm. It is used on foundations, in basements, car parks, tunnels, wells and tanks; the recommended storage period is 8 months from the date of manufacture.

Specifications

ManufacturerBentIzol — OOO “BentIzol”, Vvedenskoye
Typebentonite waterproofing
Usefoundations and basements, tunnels and metro, roofs, tanks and pools, hydraulic structures and dams
Basegeosynthetic roll material: needle-punched carrier of woven (160 µm) and nonwoven (200 µm) polypropylene with sodium bentonite granules (5.0 kg/m²); with a special polymer additive to the bentonite; laminated with 180 µm polyethylene film
Packagingrolls 1.15 × 5 m without a core on wooden pallets (35 rolls per pallet, stretch film) and 2.5 × 10 m on a core in a sealed polyethylene sleeve with lifting slings; also 5.0 × 40 m; roll weight, kg: 32 (1.15×5 m); 140 (2.5×10 m)
Application methodthe base may be damp, puddles and standing water are not permitted; on vertical surfaces “black side to the structure”: onto a finished structure — with plate dowels, dowels with press washers or powder-actuated fastening through a metal strip; to the inner side of the outer timber formwork — with a stapler or fastening gun, leaving at least 30 cm outside the formwork; along the overlaps, nails with washers at 40–50 cm spacing; on horizontal surfaces longitudinal overlap at least 15 cm, transverse at least 30 cm, stagger joints by at least 30 cm, sprinkle overlaps with bentonite granules; laminated layer facing the more aggressive side
Application temperatureinstallation at any time of year
Key propertiesmass per unit area 5,560 g/m²; permeability coefficient no more than — (impermeable) m/s; flux no more than — (impermeable) m³/m²·s; static puncture resistance at least 2.2 kN; tensile load at least 12 / 7 kN/m; elongation at break at least 20 / 10 % (longitudinal/transverse); tear strength at least 400 N/m; peel strength of the laminating layer at least 360 N/m; dynamic perforation no more than Ø10 mm; thickness at 2 kPa 6.7 mm; bond strength to concrete when cast together at least 0.17 MPa; flexibility down to −70 °C without damage; chemical resistance pH 1–13; withstands hydrostatic pressure up to 7 atm; works in fresh water, saline, alkaline and acidic solutions; unlimited service life
Layer thicknessthickness at a pressure of 2 kPa 6.7 mm
Shelf liferecommended storage period 8 months from the date of manufacture; in covered warehouses or under sheds, protected from moisture, sun, mechanical and chemical damage
StandardsSTO 87299967.004-2021 “Geosynthetic bentonite roll materials of the MASTERBENT® type”; GOST R certificate of conformity; environmental compliance certificate; seismic resistance certificate; fire safety certificate; QMS GOST ISO 9001:2015; ITB certificate (Poland); opinion of TsNIIS, Research Centre “Tunnels and Metros”

Data from the manufacturer’s technical data sheet. The coating system, number of coats and quantity are selected for your project on request.

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