contribution from Americas Styrenics’ polystyrene business to our Adjusted EBITDA of approximately 13% in 2019, 8% in 2018, and 8% in 2017.
Products and End Uses
Styrene monomer is a basic building block of plastics and a key input to many of the Company’s products. Styrene monomer is a key raw material for the production of polystyrene, and in 2019 approximately 58% of the styrene monomer produced by Americas Styrenics was consumed in its own production of polystyrene. The remainder of Americas Styrenics’ product is sold as a key raw material to other manufacturers of polystyrene, expandable polystyrene, SB latex, ABS resins, unsaturated polyethylene resins, and styrene-butadiene rubber.
Americas Styrenics also produces GPPS, high heat, high impact resin, and STYRON A-TECH™ polystyrene products. Major applications for these polystyrene products include appliances, food packaging, food service disposables, consumer electronics, and building and construction materials.
Competition and Customers
Americas Styrenics’ principal competitors are INEOS Styrolution, Total S.p.A., and LyondellBasell. In our Americas Styrenics segment, we compete primarily based on our ability to offer reliable products as well as the quality of our customer service and the length and depth of our relationships.
As a leading styrenics producer in North America, this segment is well-positioned to benefit from consolidation dynamics in the styrene and polystyrene industries within the region. However, with new styrene capacity expected in China, global styrene utilization rates are expected to decline, which may decrease global styrene margins.
Seasonality
Reporting periods impacted by the winter season and unfavorable weather conditions that typically affect the construction and building materials end markets may result in seasonally lower performance in our Americas Styrenics segment.
Our Relationship with Dow
We have entered into certain agreements with Dow, including the Second Amended and Restated Master Outsourcing Services Agreement, which was modified on June 1, 2013 (“SAR MOSA”), the Amended and Restated MOD5 Computerized Process Control Software, Licenses and Services Agreement, with Rofan Services, Inc. which was modified on June 1, 2013 (“AR MOD5 Agreement”), site and operating services agreements (“SAR SSAs”), and supply agreements.
The SAR MOSA provides for ongoing worldwide services from Dow, in areas such as information technology, enterprise resource planning, finance, environmental health and safety, training, customer service, marketing and sales support, supply chain and certain sourcing and transactional procurement services. This agreement is effective through December 31, 2020, with automatic two-year renewals, barring six-months’ notice of non-renewal provided by either party. The Company has the ability to terminate all or a portion of the services under the SAR MOSA, subject to payment of termination charges, with certain ‘highly integrated’ services following a separate process for evaluation and termination. In addition, either party may terminate for cause, for material breach which is not cured, or by Dow in the event of our failure to pay for the services thereunder. In the event of a change of control, as defined in the agreement, Dow has the right to terminate the SAR MOSA.
We use SAP’s Enterprise Resource Planning (“ERP”) software systems to support our operations worldwide and to manage our day-to-day business processes and relationships with customers and suppliers. Under the SAR MOSA, Dow provides us with ERP systems support, global data/voice network and server infrastructure for desktop computing, email, file sharing, intranet and internet website access, and mainframe and midrange computer access.
During 2018, the Company began efforts to insource, and in some cases outsource to other vendors, certain information technology, procurement, supply chain, finance, and ERP services and systems currently provided by Dow. At the end of 2019, Dow no longer provided the majority of these services, such as customer service and logistics activities, procurement services, and environmental health and safety activities. Certain information security and