High Performance Base Seals pvc waterstop to USA

I  
Q:Can you describe about the concrete pvc water stop ?
A:

Water stop being embedded in the concrete joints, acts as a continuous watertight diaphragm to prevent any seepage of liquids in constructions joints which are subject to hydrostatic pressure. It is designed for expansion or contraction joint; At the same time, it can accommodate lateral and transverse movements which make it capable to suit the moving joints.

 
 
 
 
 
 
II
Q:What are the welding method and overlapping method of pvc waterstop?
A:The following are the the welding method and overlapping method of pvc waterstop:

Weld of pvc waterstop	1.Before welding,cut the both ends of the weld plastic flat,there shall be no gap. And clean the dirt.
	2.The connector plug in the power supply is about fifteen minutes.
	3.The plastic waterstop placed in the fixture or two people opposite hold each end of plastic sealing on the welding device on both sides of about 15 - 20 mm bake.
	4.To observe the change of both ends of the plastic waterstop melting of the whole cross section and Note that do not make their color yellow or sparkling.If it is found that this situation should be removed and re modified to bake.When the two ends of the plastic melt grease evenly after baking,take off the fuse immediately and Closure and clamp or two people  increase the strength to squeeze on two end immediately. When the melting plastic bulge at the joint,the closure will bulge a thick seam, about 3-5 mm band,then release pressure after cooling lasts for about 5 minutes.
Lap of pvc water stop	1.Repair both ends of the water stop which will be lapped about the length of 100 mm with knife.
	2.With the heating of the flat iron (thickness of 4-5mm, burning red after a slightly placed 10 seconds or so) sandwiched between the bonding surface pressuring and pull the flat iron out slowly.
	3.The two section respectively overlapped with heated steel (phi 18) into a certain slope can be.

 
 
 
 
 
 
 
 
 
 
 
 
 
III
Q:How about the accelerated extraction about the pvc water stop?
A:

Accelerated extraction
Tensile Strength & ASTM D-638-68	150 kg/cm2
Elongation & ASTM D -638-68	260%-40%

 
 
 
 
 
IV
Q:Can you tell me the properties about the pvc water stop?
A:The following are the properties about the pvc water stop;

Description			Index
1. Hardness ( Shore A )			60±5	60±5	60±5
2.Tensile strength ,MPa                              ≥			15	12	10
3.Elongation at break , %                            ≥			380	380	300
4.Compression set %		70°C ×24h, %        ≤	35	35	35
		23 °C ×168h, %       ≤	20	20	20
5. Tear strength ,KN/m                               ≥			30	25	25
6.Brittleness temperature, °C                   ≤			-45	-40	-40
7.Hot air aging	70 °C ×168h	Hardness (shoreA)	+8	------	_
		Tensile strength, MPa      ≥	12	10	_
		Elongation at break, % ≥	300	300	_
	100 °C  ×168h	Hardness (shoreA)	__	__	+8
		Tensile strength, MPa                   ≥	__	__	9
		Elongation at break, % ≥	__	__	250
8. Resistance to ozone ageing50pphm:20%,48h			Grade2	Grade2	Grade0
9. Adhesion of rubber to metal			With contact section in elastomer

 
 
 

 
V
Q:What are the construction matters needing attention of the PVC water stop?
A:The following matters need attention:

1.In the course of construction,when operating,pay attention to avoid mechanical damage to the sealing belt,because there are many sharp stones and reinforced concrete.

2.When the location of the plastic water stop,the water stop should fit the interface of the concrete flat.There is no turning,no warping about the pvc water stop.Otherwise it should be carried out in a timely manner.

3.When pouring fixed sealing strip,We should prevent the water stop deviation,so as not to affect the sealing effect.

4.Use of bonding, thermal welding, etc. to ensure the plastic water stop joint firm,

5.In the process of pouring concrete,pay attention to adequate shock,to ensure the sealing strips and concrete combine.

 



VI
Q:Please describe about the quality testing of joint after welding.
A:
Weld seam protruding rib was bright and full empty sag, no leakage welding slag, no bubble.
The strip folded 180 degrees with hands and the weld joints as much as possible into sharp corners. There will be no crack,no bubble and no traces of slag. If there are defects, re fusion with welding torch welding or cutting
  
 
 

 
VII
Q:Please describe the index about the pvc water stop.
A:The following is some index about the pvc water stop:

Parameter	ASTM Standard	Standard value
Breaking strength	ASTM D-638-68	170 kg/cm2-100                               kg/cm2
Ultimate elongation	ASTM D-638-68	≥300%
Tear strength	ASTM D-624-54	60 N/mm
Hardness	ASTM D-2240-68	Type A 70 ± 5°

 
 

 
 
VIII
Q:How about the retention of properties after immersion about the pvc water stop?
A:

Retention of properties after immersion
Water Absorption at 48 hours	0.50%
ASTM D-570-63
Water-soluble material at 24 hours	0.10%
ASTM D-570-63

 
 


 
IX
Q:How about effect of Alkali (B) about the pvc water stop?
A:

Effect of Alkali (B)
Change in hardness to 7 days & ASTM D -618-61	± 5
Change in weight	0.07