Material
▪ The material types of waterproof membrane include Ethylene-Copolymer-Bitumen (ECB), Poly-Vinyl-Chloride (PVC), or other material, such as EVA and LDPE. The physical and chemical properties can fully meet all the standards requirements in Table I or Tabl.
▪ There should be layers revealing cracks on one side and the color should contrast sharply with the waterproof membrane for easy identification of cracks by naked eyes.

Size
▪ The length of waterproof membrane should be cut based on the tunnel perimeter. There should be no vertical joint except the intersection or special design.
Material requirements and testing standard: As Table I and II.
 
 ▪ ECB Waterproof Membrane Material Requirement and Testing Standard

Testing Item	Testing Standard	Testing Regulation
Thickness	2.0mm	DIN 53370
Tensile Strength	8 N/square millimeter (min.)	DIN 53455
Elongation at Break	500% (min.)	DIN 53455
Compressive Strength (20% Strain)	2.5 N/square millimeter (min.) (Length of the cubic sample is 10mm.)	DIN 53454
Anti Fracture Strength	150 N/mm (min.)	DIN 53363
Waterproof	Excellent (10 bar/10 hours)	DIN 16726
Tensile Strength of Seam	7.2 N/square millimeter (min.)	DIN 16726
Heat Resistance	±2% (max.)	DIN 16726
Water Absorption	1% (max.)	DIN 53495
Acid and Alkali Resistance (28 Days)	Loss in Tensile Strength ±20% (max.)	DIN 16726
	Elongation at Break: ±20% (max.)
Flammability	Nonflammable	DIN 4102/1

＊The length of the cubic sample is 10mm.
 
▪ PVC Waterproof Membrane Material Requirement and Testing Standard

Testing Item	Testing Standard	Testing Regulation
Thickness	2.0 mm	DIN 53370
Tensile Strength	15 N/square millimeter (min.)	DIN 53455
Elongation at Break	250 % (min.)	DIN 53455
Compressive Strength (20% Strain)	2.5 N/square millimeter (min.) (Length of the cubic sample is 10mm.)	DIN 53454
Anti Fracture Strength	100 N/mm (min.)	DIN 53363
Waterproof	Excellent (10 bar/10 hours)	DIN 16726
Tensile Strength of Seam	13.5 N/square millimeter (min.)	DIN 16726
Heat Resistance	±2% (max.)	DIN 16726
Water Absorption	1% (max.)	DIN 53495
Acid and Alkali Resistance (28 Days)	Loss in Tensile Strength: ±20% (max.)	DIN 16726
	Elongation at Break: ±20% (max.)
Flammability	Nonflammable	DIN 4102/1

＊The length of the cubic sample is better to be 10 mm.
 
PDF Download