This information reflects our best understanding of product composition in 2021.
Thermoplastic polyolefin (TPO) membranes are a type of single-ply roofing membrane that are commonly made up of two layers of TPO surrounding a woven polyester reinforcing layer, or scrim. While specific chemistry of the TPO polymer may vary...
More about Reinforced Thermoplastic Polyolefin (TPO) Roofing Membrane
Thermoplastic polyolefin (TPO) membranes are a type of single-ply roofing membrane that are commonly made up of two layers of TPO surrounding a woven polyester reinforcing layer, or scrim. While specific chemistry of the TPO polymer may vary between products, they are block copolymers that have a combination of rigid and elastic blocks to provide both thermoplastic and elastomeric properties. The polymers are composed of segments of polypropylene and one or more additional polymers such as ethylene propylene, linear low density polyethylene (LLDPE), or EPDM rubber. Typical additives include UV stabilizers, antioxidants, and pigments. TPO roofing membranes also require flame retardants. While halogenated flame retardants are not common, they could be used in some products. TPO membranes typically do not contain any plasticizers. TPO membranes are usually sold in thickness of 45, 60, and 80 mil sheets and may include up to 15% post-industrial scrap recycled back into the membrane. Similar to other types of single-ply roofing membranes, they are sold in rolls which are applied via mechanical fasteners, site- or factory-applied adhesives, or loose laid with gravel. Membrane seams are heat welded and edges are sealed using tapes or sealants.
A historical version of this Common Product is available here: https://pharosproject.net/common-products/2214443
Name | % Wt Whole | Function | GS Score | Sources | ||
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Ethene, polymer with 1-propene
9010-79-1
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71.31% | Polymer | Subscribe to view | |||
Magnesium hydroxide
1309-42-8
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13.97% | Flame Retardant, Filler | Subscribe to view | |||
Titanium dioxide
13463-67-7
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3.78% | Pigment | Subscribe to view | |||
Tris(2,4-di-tert-butylphenyl) phosphite
31570-04-4
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1.06% | Antioxidant | Subscribe to view | |||
Irganox 1010
6683-19-8
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1.01% | Antioxidant | Subscribe to view | |||
Butanedioic acid, 1,4-dimethyl ester, polymer with 4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol
65447-77-0
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0.96% | UV Stabilizer | Subscribe to view | |||
Calcium stearate
1592-23-0
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0.96% | Lubricant | Subscribe to view | |||
Carbon black
1333-86-4
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0.67% | Pigment | Subscribe to view | |||
Polyethylene Terephthalate (PET)
25038-59-9
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6.24% | Polymer | Subscribe to view | |||
Titanium dioxide
13463-67-7
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0.02% | Pigment | Subscribe to view | |||
Irganox 1010
6683-19-8
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<0.01% | Antioxidant | Subscribe to view | |||
ANTIMONY TRIOXIDE
1309-64-4
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<0.01% | Residual Catalyst | Subscribe to view |
Name | % Wt Part | % Wt Whole | Function | GS Score | Sources | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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TPO Sheet Membrane | 93.74% | 93.74% | Structure Component | Subscribe to view | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Polyester Scrim in Single-ply Roofing Membrane | 6.26% | 6.26% | Structure Component | Subscribe to view | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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CASRN | NAME | GS SCORE | TYPE | FREQUENCY | % WT CHEM | % WT PRODUCT | SOURCE | |
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CASRN | NAME | GS Score | TYPE | FREQUENCY | % WT CHEM | % WT PRODUCT | SOURCES | |
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Discussion | Carbon vs Chemicals |
Template | Manufacturer Product Disclosure Request Template |