1. Brief Introduction

Waterstop strip is also called swelling waterstop bar in market, it is a special new type waterproof products, not only it has performance of ordinary rubber products, but also its waterproofing property is better and more reliable than common rubber waterproof products. When it touch with water, its volume will swell three or four times than original volume and it will stuff up all irregular concrete joint, then achieve to stop leak thoroughly.

2. Classification

It can be divided into BW type and PZ Type. Any client can select it according to different demand of water-proof construction. It is like below picture, the red one is PZ type, the other black one is BW type.

3. Difference in PZ Type and BW Type

uThe performance of PZ Type is better than BW Type

uPZ Type is vulcanized rubber, instead, vulcanized process isn’t necessary for BW type

uAlmost all BW type is back in market, but PZ Type can be produced in different color, such as black, red, blue and so on (red and blue are more popular in market)

4.Parameter

BW Type

Item	Index
BW-150	BW-220	BW-300
Expansion Rate %	150	220	300
Flow at high temperature(80℃×5h)	No flow
Low temperature test(-20℃×2h)	No crack

PZ Type

Item	Index
PZ-150	PZ-250	PZ-400	PZ-600
Hardness (Shore A)	42±7	45±7	48±7
Tensile strength/Mpa≥	3.5	3
Elongation at break/%≥	450	350
Expansion rate in volume/%	150	250	400	600
Repeated water immersion test	Tensile strength/Mpa≥	3	2
Elongation at break/%≥	350	250
Expansion rate in volume/%≥	150	250	300	500
Low temperature bending(-20°C*2h)	No crack