Specification text 
Bentofix® NSP 4900

Pos.: ……. Amount [m²]: .…..… Unit price/m²: ………. Total price/m²: ………………

Supply of a geosynthetic clay liner (GCL), Bentofix® NSP 4900, from Naue GmbH & Co. KG or equivalent and installation on the prepared subgrade according to the manufacturer's installation guidelines. Payment is done in accordance to total covered GCL area. Overlap losses and waste due to cutting of GCL must be taken into account.

Bentofix® NSP 4900 is a Geosynthetic Clay Liner (GCL) of a continuous layer of a high swelling sodium bentonite powder, sandwiched between a needle-punched polypropylene (PP) geotextile as a cover layer and a slit-film PP woven geotextile as the carrier layer. The components are needle-punched uniformly together across the entire GCL creating a shear stress-transferring composite GCL. Additional 800g/m² bentonite with the same quality as the core bentonite is impregnated into the surface of 500mm of the length edges of the cover nonwoven geotextile during the manufacturing process to facilitate self-sealing length overlaps. An overlap guide-line delineating the overlap zone is imprinted with non-toxic ink 30cm from the woven edges of the GCL panel to ensure the accuracy of the seam.

The following equivalency average parameters (if not indicated otherwise) must be fulfilled:

Cover layer
Geotextile:								needle-punched nonwoven
Type:									Polypropylene (PP)
Mass per unit area (ISO 9864):					≥ 200g/m²

Bentonite layer
Bentonite type:							Sodium bentonite powder 
Bentonite grain size:						≤ 0.2mm
Mass per unit area (ISO 14196):				
(at ≤ 15% moisture content)				4,670g/m2
Swell index (ASTM D5890):					≥ 24ml/2g
Fluid loss (ASTM D5891):						≤ 18ml/2g
Moisture content (ISO 11465 (5h, 105°C)):			≤ 15%

Carrier layer
Geotextile:								Slit-film woven
Type:									Polypropylene (PP)
Mass per unit area (EN ISO 9864):				≥ 100g/m2

Geosynthetic clay liner
Mass per unit area (EN 14196): 		
(at ≤ 15% moisture content) 				5,000g/m2
Length overlapping areas:						self-sealing
Thickness, dry (EN ISO 9863-1):					6.0mm
Tensile strength, max., md/cmd (EN ISO 10319):		13.0 /13.0kN/m
Elongation at break, md/cmd (EN ISO 10319):			10 / 6 %
Peel strength (ASTM D6496)
Maximum peak value:					≥ 60N/10 cm
Average value: 						≥ 360N/m

Internal shear strength, 24h hydration under confining stress
(Shear apparatus according to EN ISO 12957-1, 
≥ 900cm² shear surface)
Confining stress = 20kPa, internal shear stress:			≥ 35kPa	

Static puncture test (EN ISO 12236):				2,200N

Permeability (k10) (EN 16416 / ASTM D5887):			1.2 ∙ 10-11 m/s
Permittivity (ψ10) (EN 16416 / ASTM D 5887):			1.7 ∙ 10-9 1/s
Index flux (q10) (EN 16416 / ASTM D5887):			2.6 ∙ 10-9 (m3/m2)/s
	
Needle detector tested (continuously over entire width):	Yes
Needle-punching thermally bonded onto carrier layer:		Yes

Roll dimensions:
Width x length							5.0m x 50m

The following additional documents must be provided with the offer:
•	Manufacture quality control and assurance management system following DIN 18200
•	Quality management system according to EN ISO 9001
•	Current CE-certification
•	Product group EPD (Environmental Product Declaration)

Supplier of Bentofix® NSP 4900
Naue Group
www.naue.com 

md – machine direction
cmd – cross-machine direction
										Status: 01.02.2022