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TPO CERTIFIED

What is EPDM and TPO;
EPDM rubber (ethylene propylene diene Monomer (M-class) rubber),^[1][2] a type of synthetic rubber, is an elastomer which is characterized by wide range of applications.The E refers to Ethylene, P to Propylene, D to diene and M refers to its classification in ASTM standard D-1418. The “M” class includes rubbers having a saturated chain of the polymethylene type. The diene(s) currently used in the manufacture of EPDM rubbers are DCPD (dicyclopentadiene), ENB (ethylidene norbornene) and VNB (vinyl norbornene).

A roll of EPDM foil, used for waterproofing roofs

The ethylene content is around 45% to 75%. The higher the ethylene content the higher the loading possibilities of the polymer, better mixing and extrusion. Peroxide curing these polymers give a higher crosslink density compared with their amorphous counterpart. The amorphous polymer are also excellent in processing. This is very much influenced by their molecular structure. The dienes, typically comprising between 2.5 wt% up to 12 wt% of the composition serve as crosslinks when curing with sulphur and resin, with peroxide cures the diene (or third monomer) functions as a coagent, which provide resistance to unwanted tackiness, creep or flow during end use.

Thermoplastic PolyOlefin (TPO) is a trade name that refers to polymer/filler blends usually consisting of some fraction of PP (polypropylene), PE (polyethylene), BCPP (block copolymer polypropylene), rubber, and a reinforcing filler. Common fillers include, though are not restricted to talc, fiberglass, carbon fiber, wollastonite, and MOS (Metal Oxy Sulfate). Common rubbers include EPR (ethylene-propylene rubber), EPDM (EP-diene rubber), EO (ethylene-octene), EB (ethylene-butadiene), SEBS (Styrene-ethylene-butadiene-styrene). Currently there is a great variety of commercially available rubbers and BCPP's. They are produced using regioselective and stereoselective catalysts known as metallocenes. The metallocene catalyst becomes embedded in the polymer and cannot be recovered.

The geometry of the metallocene catalyst will determine the sequence of chirality in the chain, as in, atactic, syndiotactic, isotactic, as well as average block length, molecular weight and distribution. These characteristics will in turn govern the microstructure of the blend.

The components are blended together at 210 - 270 °C under high shear. A twin screw extruder or a continuous mixer may be employed to achieve a continuous stream, or a Banbury compounder may be employed for batch production. A higher degree of mixing and dispersion is achieved in the batch process, but the superheat batch must immediately be processed through an extruder to be pelletized into a transportable intermediate. Thus batch production essentially adds an additional cost step.

As in metal alloys the properties of a TPO product depend greatly upon controlling the size and distribution of the microstructure. PP and PE form a vaguely crystalline structure known as a spherulite. Unlike metals, a spherulite cannot be described in terms of a lattice or unit cell, but rather as a set of polymer chains that pack down closely next to one another and form a dense core. The PP and PE components of a blend constitute the "crystalline phase", and the rubber gives the "amorphous phase".

If PP and PE are the dominant component of a TPO blend then the rubber fraction will be dispersed into a continuous matrix of "crystalline" polypropylene. If the fraction of rubber is greater than 40% phase inversion may be possible when the blend cools, resulting in an amorphous continuous phase, and a crystalline dispersed phase. This type of material is non-rigid, and is sometimes called TPR for ThermoPlastic Rubber.

To increase the rigidity of a TPO blend, fillers exploit a surface tension phenomena. By selecting a filler with a higher surface area per weight, we can achieve a higher flexural modulus.

TPO blends have densities 0.92 - 1.1

TPO is frequently found in outdoor applications such as roofing because it does not degrade[1] under solar UV radiation, a common problem with nylons. TPO is used extensively in the automotive industry.

TPO is easily processed by injection molding, profile extrusion, and thermoforming. TPO cannot be blown, or sustain a film thickness less than 1/4 mil (about 6 micrometres), where 1 mil is equal to 0.001 inch.

Energy-Efficient Membranes  

Versico manufactures three highly reflective,

energy-efficient single-ply roofing membranes that 

help reduce a building’s heating and cooling costs 

as well as its overall energy consumption. From its

heat-weldable VersiWeld® TPO and VersiFlex® PVC

to its innovative VersiGard® White EPDM, Versico 

has a product and system for every energyeffi

cient design.

VersiWeld, VersiFlex and VersiGard White 

membranes carry the ENERGY STAR® rating, having 

exceeded the stringent program guidelines for solar

refl ectance and heat emittance. These products 

are also CRRC (Cool Roof Rating Council) certified 

and Title 24 compliant.

• Highly refl ective, ENERGY STAR-rated membranes

• CRRC certified

• Title 24 compliant

• Chlorine-free membranes

• Cool-roof materials

• Manufactured with recycled content

• Low-VOC adhesives

Local Service Area Includes: Katy, Sugarland, Houston, League City, Pearland, Alvin, Galveston, Texas City, Baytown, LaPorte, spring, Kingwood, The Woodlands, Conroe, Champions, Cypress, Beaumont, Orange, Port Arthur, and Louisiana

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