Polytech? ST-Pre waterproofing membrane

Scope of application

Underground engineering floor and side wall of the basement with small construction space, mining method tunnel.

Product specifications

Model	Thickness（mm）	Wide（m）	Length（m)
Category P (plastic)	1.2、1.5、1.7	1	20

Product features

1. Using pre-paving anti-adhesive method construction, the waterproof membrane and concrete structure form an excellent full adhesion effect, waterproof and reliable without channeling water.

2. Based on HDPE sheet, the coil has excellent physical properties, high strength and good puncture resistance.

3. Butyl self-adhesive layer has excellent aging resistance and water resistance, and can be used in complex underground environments.

Technical indicators

Executive standard: GB/T23457-2017 "Pre-paved waterproofing membrane"

Project		Indicators (P category)
Tensile properties	pulling force/（N/50mm）≥	600
	Tensile strength/MPa≥	16
	Membrane rupture elongation/%≥	400
	Phenomenon when stretching	There is no separation between the adhesive layer and the main material
Nail rod tear strength/N≥		400
Puncture resistance/N≥		350
Impact resistance(0.5kg·m)		No leakage
Resistant to static loads		20kg, no leakage
Heat tolerance		80 °C, 2h no slip, flow, dripping
Low temperature bending		The main material is -35 °C, no cracks
Low temperature flexibility		Adhesive layer -25 °C, no cracks
Oil permeability/number of sheets≤		1
Resistance to channeling (hydraulic gradient)		0.8MPa/35mm, 4h no channeling
Impermeable（0.3MPa，，，，，，120min）		Impermeable
With post-poured concrete Peel strength/（N/mm）	No processing≥	1.5
	Water immersion treatment≥	1.0
	Sediment contaminates the surface≥	1.0
	UV treatment≥	1.0
	Heat treatment≥	1.0
Peel strength after water immersion with post-poured concrete/（N/mm）≥		1.0
Coil to coil peel strength (lap edge)/（N/mm）	No processing≥	0.8
Coil to coil peel strength (lap edge)/（N/mm）	Water immersion treatment≥	0.8
The anti-stick treatment part of the coil has strong peeling/（N/mm）≤		Non-adhesive
Heat aging （80℃，，，，，，168h）	Pull retention/%≥	90
	Elongation retention/%≥	80
	Low temperature bending	The main material is -32 °C, no cracks
	Low temperature flexibility	Adhesive layer -23 °C, no cracks
Rate of dimensional change/%≤		±1.5

Construction steps

Base layer cleaning → Bullet line positioning → Large surface paving waterproofing membrane → Lap treatment → Detailed node sealing → Self-inspection, repair, acceptance → Lashing steel bars

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