TPO Roofing Membrane System

1. TPO Roofing Membrane

Brief Introduction:
TPO, an abbreviation of Thermal Polyolefin, is made by adopting special formulation, without adding any plasticizer and chlorine. Compared with other kinds of thermoplastic waterproof material, TPO has better performance in terms of low-temperature flexibility, anti-aging, and physical stability. What’s more, it is environmentally-friendly and can form a watertight unity. As a result, this waterproof material has an increasing popularity in America and European countries.
Yuhong TPO roofing membrane is the sheeted waterproof material that adopts TPO (made from EP rubber and polypropylene through advanced polymerization technology) as the base material, and uses girdding fabric of polyester fiber as the embryo reinforcing material.

Product Specifications:

Thickness(mm)	Width(m)	Length(m)
1.2	2.0, 2.4, 3.0, 3.6	15, 20, 30
1.5

Performance Index of TPO Roofing Membrane:

Item			Performance Index
Tensile strength at break, N/50mm ≥			500
Elongation at break, % ≥			450
Tear strength, N ≥			20
Water impermeability(0.3MPa, 30min)			No leakage
Low temperature bending temperature, ℃ ≤			-40
Heating extensive quantity(80℃, 168h) mm		Extend ≤	2
		Shrink ≤	2
Seam peel strength, N/mm ≥			1.5
Water absorbing capacity(70℃, 166h), % ≤			3.0
Alkali resistance (10%Ca(OH)2, Normal conditions, 168h)	Conservation rate of tensile strength at break, % ≥		90
	Maximum elongation, % ≥		90
Anti-ozone performance (40℃ *168h, 200*10-8 )			No cracking
Hot air aging(116℃, 680h)	Conservation rate of breaking strength, % ≥		90
	Conservation rate of tensile strength at break, % ≥		90
Artificial weathering	Conservation rate of breaking strength, % ≥		90
	Conservation rate of tensile strength at break, % ≥		90
Combined strength(FSZ type surface layer and sandwich layer)N/mm ≥			1.2

Features of TPO Roofing Membrane:
1. TPO material combines the advantages of the EP (weather resistance and durability) and polypropylene (weldability).
2. Special formulation, need no plasticizer (which may make the material fragile), with high flexibility and long-term waterproof performance
3. There is a layer of polestar fabric between two layers of TPO materials, which can improve the physical performance, breaking strength, as well as fatigue-resistance and puncture-resistance ability. So it is applicable to mechanical fastening roofing system.
4. Outstanding flexibility at low temperature(-40℃), super mechanical strength at high temperature.
5. Thermal aging resistance, good dimension stability
6. Exceptional chemical resistance: corrosion resistant to acid, alkali, salt, animal fat, vegetable oil, lubricant
7. The TPO in the surface of the reinforcing layer is mainly in white color, reflexible and smooth.
8. For it contains no chlorinated polymer or chlorine, it is beneficial to the environment and construction safety.
9. Adopt thermal welding for overlapping, which can form high strength sealing layer.

Application Scope:
Yuhong TPO roofing membrane is mainly applied in industrial and civil buildings, public buildings as well as other kinds of waterproof roofing projects.

2. TPO Waterproof Membrane Thermal Welding System

TPO Membrane Thermal Welding System
TPO membrane lap seam adopts adhesive lap joint using hot air. The adjacent membranes overlap each other by means of thermal welding to form continuous sealing waterproof layer of the whole membrane. Thermal welding is applicable to fix each membrane and substrate.

TPO Membrane Roofing System (Mechanical Fastening)
TPO membrane roofing system usually adopts mechanical fastening. Fastening screw or setting-up piece are used to fix the lower layer of membrane overlap to the substrate, while the overlap between the upper layer of membrane and the lower layer of membrane adopts hot air welding. The outer edge of joint can be sealed by sealant according to engineering requirement.

Mechanical Fastening System Construction Points
1. Substrate: The substrate the TPO will be laid should be firm, smooth, clean and dry. The movement joint part should be sealed at first, and add an extra TPO membrane as an additional layer.
2. Pre-laying of TPO membrane: Lay the membrane orderly, avoiding twisting or overlapping of the adjacent membranes.
3. Overlap uses thermal welding, 150mm wide membrane (long side) should be removed between two adjacent membranes, the fasteners of the lower layer of the membrane are covered by the upper layer, clear the welding zone before perform welding by welding torch.
4. Additional waterproofing in some special parts: Adopt non-reinforced TPO affusion substrate as the additional waterproof layer, which connects to the main waterproof layer through hot air welding.

TPO Membrane Adhesive System
The substrate and the underside of membrane are fully coated with cementing agent. The overlap of the adjacent membranes is welded by hot air, and the edge is sealed by sealant. The bonding process is applicable to the buildings that are cement concrete base.

Seam Overlapping Conditions
Auto hot air welding machine: usually, welding pressure: about 500~550N, welding temperature: 500~550℃, welding speed: 1.5-2m/min.
Manual welding: temperature of the welding torch is controlled from 250 to 450℃, welding speed is from 0.2 to 0.5 m/min.

Construction Hints:
1. The operating staff must be trained before go on duty.
2. Before welding, ensure that the material surface is clean, without any dirt
3. Inspect welding quality
4. The person wearing spiked shoes is forbidden to enter the construction sites.

Package, Transportation and Preservation:
1. The membrane is curled into a cylindrical shape, packed by suitable materials.
2. During transport and storage, pay attention to the package, store the membrane in a dry, ventilative, level place, prevent it from contacting acid, alkali, oil and organic solvent.
3. Under normal condition, the storage life is 1 year.

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