- products & services
- your industry
- about us
With more than 30 years of market presence, Santoprene™ thermoplastic vulcanizates (TPV) have proven to be dependable polymers for flexible engineered parts that require long-term performance. Santoprene TPV has become the global standard for engineered TPV, in most demanding automotive and industrial applications.
Thermoplastic elastomers (TPE) are a diverse family of rubber-like materials that, unlike conventional thermoset rubber, can be processed and recycled within the manufacturing process like thermoplastic materials.
Santoprene TPV is fully dynamically vulcanized ethylene propylene diene monomer (EPDM) rubber in a thermoplastic matrix of polypropylene (PP). It looks, feels and behaves like rubber but, due to the PP content, offers simple, flexible part design and manufacturing.
Depending on the ratio of EPDM rubber to PP, the physical properties such as hardness, modulus and flexibility will vary.
Find out more about ExxonMobil Chemical’s specialty elastomers by viewing our knowledge libraryBack to Top
Santoprene TPV is a high performance elastomer comprising polypropylene, EPDM rubber and other products, which exhibits the properties of rubber while providing the ease of processing of plastics. It has proven to be a dependable polymer for flexible engineered parts that require long-term performance.
Santoprene TPV offers manufacturing flexibility, ease of processing and consistent durability. It can deliver outstanding performance for automotive and demanding industrial applications. With the potential for reduced system costs, compared to materials such as thermoset rubber, and the potential for sustainability benefits, Santoprene TPV has become the global standard for engineered TPV.
Combining the characteristics of vulcanized rubber with the processing ease of thermoplastics, Santoprene TPV offers a sealing solution that is both durable and attractive for a variety of market segments, including: automotive, household appliances, electrical, construction and healthcare.
Visit our knowledge library for a comprehensive look at our product information.
Explore the proven benefits of Santoprene TPV.Back to Top
Santoprene TPV continues to demonstrate success in a wide range of applications in the automotive, commercial, and industrial sectors – providing proven solutions from weatherseals to electrical components.
What is the difference between Santoprene TPV and Vistalon™ EPDM?
Santoprene TPV has the look, feel and behavior of EPDM rubber, but it can be processed on conventional thermoplastic processing equipment. This allows simplified, more flexible part design and easier manufacturing when compared to EPDM rubber. The main advantage of a TPV over EPDM rubber is lower weight for parts with a similar design. The weight reduction can be as high as 30%.
What is the best Santoprene TPV grade for automotive weatherseals?
Santoprene TPV offers features and benefits for a range of dynamic or static automotive weatherseal applications that include:
• Sealing performance: excellent seal retention over time provides durability
• Excellent UV and ozone resistance: good aesthetic appearance for the life of the part with no bloom
• Good adhesion to PP or TPO: excellent design flexibility and parts integration for easy assembly and system functionality
• Low specific gravity: lower part weight compared to thermoset rubber and PVC can translate into improved fuel economy
• Processing ease and flexibility: reduced part costs can be achieved because:
• Recyclability: in-process scrap can be ground for reuse or recycling
Find out about the many different Santoprene TPV grades and the weatherseal applications for which they are best suited.
Our AnswerPerson support service is comprised of a team of technical specialists providing fast, accurate answers to a wide range of questions − from part design assistance to which grade of SantopreneTM TPV to use. Drawing on an extensive database of knowledge, AnswerPerson support service is your link to 40 years of Santoprene TPV manufacturing, design and technical information. Our AnswerPerson support specialists are located around the world and can respond quickly to your question, regardless of your location. If you have a question and want to contact our AnswerPerson support, just click here.Back to Top
According to ISO18064, the recycling code for Santoprene TPV is: TPV-(EPMD+PP)Back to Top
Santoprene TPV grades are placed into IMDS using the following method:
• They are entered into IMDS as "Materials"
• They are identified by a "trade name" as well as by an "ID"
• Data is "published" without restriction, which means it can be consulted by any company that is authorized to access IMDS
CAS numbers are normally only given to pure products. This means products consisting of one type of molecule only. The CAS number is used to equivocally identify these materials and make the identification independent of whatever naming system is used to give a molecule a name.
Since Santoprene TPV is a mixture of products (PP, EPDM rubber and other products) it cannot be attributed a CAS number. The constituents of Santoprene TPV have a CAS number, but these are the proprietary information of ExxonMobil Chemical.
Prototyping is the only method to determine accurate shrinkage data for Santoprene TPV (assuming the desired dimensions of a part can be attained). This should be used on a single cavity mold that is built in a “steel safe” condition to allow for small corrections and is gated in the same location(s) as the production mold.
Prototype samples should be run for at least 30 minutes under the same conditions as would be used for a production run. It is best to make the dimensional measurements after a 48-hour period at room temperature, as 85% of shrinkage will occur during this time. It is important to note that with crystalline or partially crystalline materials, such as polyethylene (PE) or PP, the ultimate shrinkage may not be reached for days, weeks or even months.
Numerous factors affect shrinkage, including:
• Material: hardness, viscosity, and type (general purpose, molding, high flow, etc.)
• Part and tool design: geometry of part; length and wall thickness of part; runner style and size; gate type, size and position; vent locations and sizes
• Process conditions: melt temperature, ram velocity, mold temperature, cooling time, injection fill pressure, pack pressure, hold pressure
See technical literature about the shrinkage rates of injection molded Santoprene TPV.
Fluid resistance is available for 40 grades of Santoprene TPV and 39 different fluid mediums ranging from 1-propanol to zinc chloride, 10%.
See the full Santoprene TPV fluid resistance guide.
Recycling and regrinding
Santoprene TPV can contribute to a reduction in overall waste in the manufacturing process as scrap produced during processing can be recycled. The recycling code for Santoprene TPV is TPV-(EPDM+PP).
Up to 20% regrind can be used without affecting the physical properties of the final part. It is recommended that the shape of the regrind granules is as close as possible to virgin Santoprene TPV material for a homogenous blend.
See the technical literature about the regrind stability of Santoprene TPV in the blow molding process.
Bonding Santoprene TPV to metal
In insert molding, if the insert and the TPV are compatible materials, a melt bond occurs at the interface between the two materials. Non-compatible insert materials such as metal can also be used, but an adhesive must be applied to the insert so that it bonds with the TPV. There is one exception; ExxonMobil Chemical does manufacture a special Santoprene TL grade that can bond with metal.
Another way of combining incompatible materials is to design the part with mechanical locks, so the molten TPV material flows into the locking area and creates a bond.
For low-volume applications requiring insert molding, the inserts can be hand-loaded. For higher volumes, robotic pick and place equipment may be a cost effective choice. Applications need to be evaluated on a case-by-case basis to learn which method is most cost effective.
Learn more about the processing and insert molding of Santoprene TPV.
Bonding Santoprene TPV to other plastics
Many Santoprene TPV grades can bond to a wide range of other polymers, such as PC, ABS, PS, PET and blends, PA and ExxonMobil™ PP.
Insert molding (sometimes called overmolding)
Santoprene TPV bonding grades B100 and B150 excel at overmolding onto engineered thermoplastics such as PC, ABS, PS, PET and blends, PA, ExxonMobil PP, and a variety of other materials. Grades also bond to PMMA, ASA and PPO/PS blends.
To find details about Santoprene TPV bonding grades B100 and B150, see the bonding grade slate for engineered plastics.
Two-shot injection molding
Used in injection molding, Santoprene TPV B500 bonding grades offer standout noise, vibration and heat performance as well as excellent bonding to PA components.
ExxonMobil Chemical has licensed manufacturing rights for the Santoprene™ thermoplastic vulcanizate (TPV) nylon bondable thermoplastic elastomer (TPE) product line to RTP Company. RTP Company now produces and sells the products globally under RTP 6091 Series bondable thermoplastic elastomer compounds.
Specialty Santoprene TPV grades also exist to bond to ABS, PC, PS, EPDM rubber, and metals.Back to Top
Find out more about Santoprene TPV and REACH, the European Community Regulation on chemicals and their safe use (EC 1907/2006) which deals with the Registration, Evaluation, Authorization and Restriction of Chemical substances.Back to Top
ExxonMobil Chemical uses a nomenclature system to identify and describe our products.
Santoprene TPV grade discontinuation
In order to ensure that the product offering remains both competitive and sustainable, ExxonMobil Chemical regularly takes the opportunity to review its Santoprene TPV product portfolio to streamline its product range.
It may be possible that a grade being used by a customer is no longer listed or available. If this is the case, customers should contact our technical support group for confirmation that the grade is no longer available and to determine a proposition for an alternative grade.Back to Top
How Santoprene TPV rates against OEM specifications varies from product to product and the component for which it is intended.
For details of which Santoprene TPV grades meet different automotive OEM specifications in the US, check our compliance documents. For Europe and Asia, please get in touch with our AnswerPerson℠ for more information.
What is the classification of Santoprene TPV according PSA B620300?
The classification of Santoprene TPV according to PSA B620300 varies from product to product. This information is regularly reviewed with respect to all of ExxonMobil Chemical’s automotive classifications (USA, EU, and Asia OEM), what information will be published, and in which format. Each grade has a different classification depending on the OEM.
See technical literature about Santoprene TPV automotive specifications.Back to Top