The following discussion should be read in conjunction with our consolidated financial statements and the notes thereto included in "Item 8. Financial Statements and Supplementary Data." Some of the information contained in this discussion and analysis or included elsewhere in this report, including information with respect to our plans and strategy for our business, includes forward-looking statements that involve risks and uncertainties. Please see "Forward-looking Statements" for more information. You should review "Risk Factors" for a discussion of important factors that could cause actual results to differ materially from the results described in or implied by the forward-looking statements contained herein.

Overview

We are a leading global high-technology filtration company that develops, manufactures and markets specialized microporous membranes used in separation and filtration processes. In fiscal 2012, we generated total net sales of $717.4 million. We operate in two primary businesses: energy storage, which includes the transportation and industrial segment and the electronics and EDVs segment, and separations media. The transportation and industrial and separations media segments represent approximately 75% of our total net sales and operate in stable, growing markets, have high recurring revenue bases and generate strong cash flows. In the electronics and EDVs segment, we have a key presence in the more established consumer electronics market and participate in the potentially larger and developing electric drive vehicle ("EDV") and energy storage systems ("ESS") markets where lithium is the disruptive technology. As described in more detail below, the long-term growth drivers for lithium batteries are positive, but we have and may continue to experience variability in the short term as these markets emerge.

Since 2009, we have made significant investments in capacity expansion projects, all of which were funded by internally generated cash and a $49.3 million grant from the U.S. Department of Energy ("DOE"). Beginning in 2013, cash flows from operations and lower capital expenditures position us to generate significant amounts of cash. In addition, the United States Federal Trade Commission ("FTC") has ordered us to divest substantially all of the assets acquired in connection with the 2008 acquisition of Microporous Products L.P. ("Microporous"). We are pursuing our legal options and at the same time, evaluating alternatives for these assets. If we divest of all or a portion of these assets, we would intend to sell the assets at fair market value which would provide additional cash. As we transition into a period of substantial cash generation, we intend to maintain a total leverage ratio, defined in our credit agreement as the ratio of total indebtedness (total debt less cash on hand of up to $50.0 million) to adjusted EBITDA (as defined in our credit agreement and calculated in the liquidity and capital resources section), of approximately 3.0x, while also evaluating other alternatives for cash, including returning value to shareholders through share repurchases.

Energy Storage

In the energy storage business, our membrane separators are a critical performance component in lithium batteries, which are primarily used in consumer electronics and EDV applications, and lead-acid batteries, which are used globally in transportation and numerous industrial applications. We believe that the long-term growth drivers for the energy storage business-growth in Asia, demand for

consumer electronics and growing demand for EDVs-are positive. The energy storage business is comprised of two reportable segments.

Electronics and EDVs. Lithium batteries are the power source in a wide variety of applications, including consumer electronics applications such as notebook computers, tablets, mobile phones and cordless power tools; EDVs; and emerging applications such as ESS. Demand for lithium batteries in consumer electronics is driven by the need for increased mobility. In EDV applications, demand is driven by the need to increase fuel efficiency to meet mileage standards in many countries such as the U.S. and China, the need to reduce CO2 emissions around the world but especially in Europe due to regulations, conversion from nickel metal hydride to lithium battery technology in hybrid vehicles due to greater energy and power density, concern in developed countries and emerging markets over future access to petroleum at stable prices, smog and pollution control, and the need to address increasing transportation needs in developing economies. Since late 2009, we have expanded capacity at our existing Charlotte, North Carolina and Ochang, South Korea facilities and built a new facility in Concord, North Carolina. Equipment installation for the Concord facility is substantially complete and production has started for portions of the facility. The remaining capacity at Concord will ramp up over time as the nascent market for EDVs develops.

Although sales declined during 2012, we expect overall demand to increase in 2013 and we believe the long-term demand drivers for our products-consumer demand for mobility, regulations for fuel efficiency and CO2 emissions, conversion to lithium technology in hybrids, concerns about access to petroleum, efforts to reduce pollution, and increasing transportation needs in developing countries-remain fully intact. While consumer electronics applications have attractive long-term market growth trends, EDV and eventually ESS applications have the potential to be much larger markets. Based on industry forecasts and industry studies, unit sales of lithium batteries for EDV applications are expected to grow at a compound annual growth rate of greater than 40% over the next five years. We believe lithium battery separator growth will exceed battery unit sales growth because the trend towards larger batteries will require the use of more separator in each battery. Industry forecasts also predict EDV sales to be 5% or more of new car sales within the next five years. If 5% of new car sales were EDVs, we believe the entire lithium battery separator market would virtually double in total size. Based on our current customer base, if only a portion of these industry forecasts materialize, we believe we will completely utilize our current production capacity. We believe the electrification of the worldwide fleet of vehicles is just beginning, from hybrids to plug-ins to full battery electric vehicles, including automobiles, buses, taxis and commercial fleet vehicles. Hybrids are selling well and regulations around the world are driving development and introductions. New hybrids are coming to market and some high-separator content vehicles have just been introduced in Europe. We believe our dry process products continue to be the preferred product in large format lithium-ion batteries for EDVs and ESS. We are currently working with existing and new customers on next-generation batteries, which is important considering the long lead times required to become qualified for EDV applications. EDV and ESS are emerging market applications and are being adopted around the world in many forms. We believe the factors that influenced our decision to expand capacity remain valid, and we continue to expect significant sales growth as the EDV market develops and as ESS experiences more meaningful adoption. Although the long-term growth drivers are positive for these applications, short-term fluctuations in demand can be expected in the early stages of adoption while initial penetration rates are low. Given the high-separator content for these applications, and the potential size of these markets, small changes in end-market demand can have a significant impact on our business.

Transportation and industrial. In the lead-acid battery market, the high proportion of aftermarket replacement sales and the steady growth of the worldwide fleet of motor vehicles provide us with a growing recurring revenue base in lead-acid battery separators. Worldwide demand for lead-acid battery separators is expected to continue to grow at slightly more than annual economic growth. The Asia-Pacific region is the fastest growing market for lead-acid battery separators. Growth in this region is driven by the increasing penetration of automobile ownership, growth in industrial and manufacturing

sectors, export incentives and ongoing conversion to the polyethylene-based membrane separators we produce. We are meeting growing demand in this region by investing in Asia and exporting from our U.S. and European facilities. Our investments in Asia have included completing three capacity expansions at our Prachinburi, Thailand facility, the most recent of which started production in the second quarter of 2012; acquiring battery separator manufacturing assets and subsequently expanding our operations in Bangalore, India; acquiring a production facility in Tianjin, China; establishing an Asian Technical Center in Thailand; and entering into a joint venture with a customer, Camel Group Co., Ltd. ("Camel"), to produce lead-acid battery separators in Xiangyang, China, primarily for Camel's use.

Separations Media

In the separations media business, our filtration membranes and modules are used in healthcare and high-performance filtration and specialty applications. We believe that the separations media business will continue to benefit from continued growth in demand for higher levels of purity in a growing number of applications. The separations media business is a reportable segment.

For healthcare applications, we produce membranes used in blood filtration applications for hemodialysis, blood oxygenation and plasmapheresis. Growth in demand for hemodialysis membranes is driven by the increasing worldwide population of end-stage renal disease patients. We believe that conversion to single-use dialyzers and increasing treatment frequency will result in additional dialyzer market growth. In late 2011, we completed the expansion of our PUREMA ® hemodialysis membrane production capacity to support future market growth.

For filtration and specialty applications, we produce a wide range of membranes and membrane-based elements for micro-, ultra- and nanofiltration and gasification/degasification of liquids. Micro-, ultra-and nanofiltration membrane element market growth is being driven by several factors, including end-market growth in applications such as water treatment and pharmaceutical processing, displacement of conventional filtration media by membrane filtration due to membranes' superior cost and performance attributes, and increasing purity requirements in industrial and other applications.

Critical accounting policies

Critical accounting policies are those accounting policies that can have a significant impact on the presentation of our financial condition and results of operations, and that require the use of complex and subjective estimates based on past experience and management's judgment. Because of the uncertainty inherent in such estimates, actual results may differ from these estimates. Below are those policies that we believe are critical to the understanding of our operating results and financial condition. Management has discussed the development and selection of these critical accounting policies with the Audit Committee of our Board of Directors. For additional accounting policies, see Note 2 of the consolidated financial statements included in "Item 8. Financial Statements and Supplementary Data."

Allowance for doubtful accounts

Accounts receivable are primarily composed of amounts owed to us through our operating activities and are presented net of an allowance for doubtful accounts. We establish an allowance for doubtful accounts based upon factors surrounding the credit risk of specific customers, historical trends and other information. We charge accounts receivables off against our allowance for doubtful accounts when we deem them to be uncollectible on a specific identification basis. The determination of the amount of the allowance for doubtful accounts is subject to judgment and estimated by management. If circumstances or economic conditions deteriorate, we may need to increase the allowance for doubtful accounts.

Impairment of intangibles and goodwill

Identified intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. Goodwill and indefinite-lived intangible assets are not amortized, but are subject to annual impairment testing unless circumstances dictate more frequent assessments. We perform our annual impairment assessment for goodwill and indefinite-lived intangibles as of the first day of the fourth quarter of each fiscal year and more frequently whenever events or changes in circumstances indicate that the fair value of the asset may be less than the carrying amount. Our reporting units are at the operating segment level. In September 2011, the FASB amended the accounting guidance on annual goodwill impairment testing to allow companies the option to assess certain qualitative factors or use the quantitative two-step goodwill impairment test. The guidance states that if a company chooses the option to assess certain qualitative factors and determines, based on the assessment of qualitative factors, that it is more likely than not that the carrying amount of a reporting unit is less than its fair value, then the first and second steps of the quantitative goodwill impairment test are unnecessary. However, if a qualitative assessment is performed and indicates that it is more likely than not that the fair value of a reporting unit is less than its carrying amount, the quantitative two-step goodwill impairment test must be performed at the reporting unit level.

When performing a quantitative two-step goodwill impairment test, step one compares the fair value of our reporting units to their carrying amount. The fair value of the reporting unit is determined using the income approach, corroborated by comparison to market capitalization and key multiples of comparable companies. Under the income approach, we determine fair value based on estimated future cash flows of each reporting unit, discounted by an estimated weighted-average cost of capital. If the fair value of the reporting unit is greater than its carrying amount, there is no impairment. If the reporting unit's carrying amount exceeds its fair value, then the second step must be completed to measure the amount of impairment, if any. Step two calculates the implied fair value of goodwill by deducting the fair value of all tangible and intangible net assets of the reporting unit from the fair value of the reporting unit as calculated in step one. In this step, the fair value of the reporting unit is allocated to all of the reporting unit's assets and liabilities in a hypothetical purchase price allocation as if the reporting unit had been acquired on that date. If the carrying amount of goodwill exceeds the implied fair value of goodwill, an impairment loss will be recognized in an amount equal to the excess.

Determining the fair value of a reporting unit is judgmental in nature and requires the use of significant estimates and assumptions, including revenue growth rates, strategic plans and future market conditions, among others. There can be no assurance that our estimates and assumptions made for purposes of the goodwill impairment testing will prove to be accurate predictions of the future. If our assumptions regarding forecasted revenue or margin growth rates of certain reporting units are not achieved or changes in strategy or market conditions occur, we may be required to record goodwill impairment charges in future periods. It is not possible at this time to determine if any such future impairment charge would result or, if it does, whether such charge would be material.

In fiscal 2012, our annual impairment test indicated that the fair value of the reporting units exceeded their respective carrying amounts by substantially more than 10%.

Pension benefits

Certain assumptions are used in the calculation of the actuarial valuation of our defined benefit pension plans. Two critical assumptions, discount rate and expected return on assets, are important elements of plan expense and/or liability measurement and differences between actual results and these two actuarial assumptions can materially affect our projected benefit obligation or the valuation of our plan assets. Other assumptions involve demographic factors such as retirement, expected increases in compensation, mortality and turnover. The discount rate enables us to state expected future cash flows at a present value on the measurement date. The discount rate assumptions are based on the market

rate for high quality fixed income investments. At December 29, 2012, a 1% decrease in the discount rate would increase our projected benefit obligations and the unfunded status of our pension plans by $21.0 million. The expected rates of return on our pension plans' assets are based on the asset allocation of each plan and the long-term projected return of those assets. For 2012, if the expected rate of return on pension plan assets were reduced by 1%, the result would have increased our net periodic benefit expense for fiscal 2012 by $0.1 million. At December 29, 2012, if the actual plan assets were reduced by 1%, the unfunded status of our pension plans would increase by $0.2 million.

Environmental matters

Environmental obligations are accrued when such expenditures are probable and reasonably estimable. The amount of liability recorded is based on currently available information, including the progress of remedial investigations, current status of discussions with regulatory authorities regarding the method and extent of remediation, presently enacted laws and existing technology. Accruals for estimated losses from environmental obligations are adjusted as further information develops or circumstances change. We do not currently anticipate any material loss in excess of the amounts accrued. Future remediation expenses may be affected by a number of uncertainties including, but not limited to, the difficulty in estimating the extent and method of remediation, the evolving nature of environmental regulations and the availability and application of technology. Recoveries of environmental costs from other parties are recognized as assets when their receipt is deemed probable.

In connection with the acquisition of Membrana GmbH ("Membrana") in 2002, we recorded a reserve for environmental obligations. The reserve provides for costs to remediate known environmental issues and operational upgrades which are required in order for us to remain in compliance with local regulations. The initial estimate and subsequent finalization of the reserve was included in the allocation of purchase price at the date of acquisition. At December 29, 2012, the environmental reserve for the Membrana facility, which is denominated in euros, was $11.1 million. We anticipate the expenditures associated with the reserve will be made in the next twelve months.

We have indemnification agreements for certain environmental matters from Acordis A.G. ("Acordis") and Akzo Nobel N.V. ("Akzo"), the prior owners of Membrana. Akzo originally provided broad environmental protections to Acordis with the right to assign such indemnities to Acordis's successors. Akzo's indemnifications relate to conditions existing prior to December 1999, which is the date that Membrana was sold to Acordis. In addition to the Akzo indemnification, Acordis provides separate indemnification of claims incurred from December 1999 through February 2002, the acquisition date. We will receive indemnification payments under the indemnification agreements after expenditures are made against approved claims. At December 29, 2012, the amounts receivable, which are denominated in euros, under the indemnification agreements were $11.5 million.

Repairs and Maintenance

Repair and maintenance costs, which include indirect labor and employee benefits associated with maintenance personnel and utility, maintenance and repair costs for equipment and facilities utilized in the manufacturing process, are treated as inventoriable costs. Repair and maintenance costs as a percent of cost of goods sold has been consistent for fiscal 2012, 2011 and 2010. Major planned maintenance activities outside of the normal production process are capitalized as property, plant and equipment if the costs are expected to provide future benefits by increasing the service potential of the asset to which the repair or maintenance applies. We have not had any major planned maintenance activities or capitalized significant repair and maintenance costs as property, plant and equipment in the last three fiscal years.

Results of operations

The following table sets forth, for the fiscal years indicated, certain of our historical operating data in amount and as a percentage of net sales:

                                                              Fiscal Year
       (in millions)                                   2012      2011      2010
       Net sales                                      $ 717.4   $ 763.1   $ 616.6

       Gross profit                                     263.9     322.1     246.9
       Selling, general and administrative expenses     123.9     132.6     114.0

       Operating income                                 140.0     189.5     132.9
       Interest expense, net                             36.0      34.4      46.7
       Other                                              2.5      (2.0 )    (2.4 )

       Income before income taxes                       101.5     157.1      88.6
       Income taxes                                      30.5      51.9      25.0

       Net income                                     $  71.0   $ 105.2   $  63.6

                                                              Fiscal Year
       (percent of sales)                              2012      2011      2010
       Net sales                                        100.0 %   100.0 %   100.0 %

       Gross profit                                      36.8      42.2      40.0
       Selling, general and administrative expenses      17.3      17.4      18.4

       Operating income                                  19.5      24.8      21.6
       Interest expense, net                              5.0       4.5       7.6
       Other                                              0.4      (0.3 )    (0.4 )

       Income before income taxes                        14.1      20.6      14.4
       Income taxes                                       4.2       6.8       4.1

       Net income                                         9.9 %    13.8 %    10.3 %

Fiscal 2012 compared with fiscal 2011

Net sales. Net sales for fiscal 2012 were $717.4 million, a decrease of $45.7 million, or 6.0%, from fiscal 2011, as higher sales in the transportation and industrial and separations media segments were more than offset by lower sales in the electronics and EDVs segment and the negative impact of foreign currency translation of $24.4 million.

Gross profit. Gross profit was $263.9 million, a decrease of $58.2 million, or 18.1%, from fiscal 2011. Gross profit as a percent of net sales was 36.8% for fiscal 2012 compared to 42.2% for fiscal 2011. The decrease in consolidated gross profit and gross profit margin was primarily due to lower sales, costs associated with growth investments, including non-cash depreciation expense, and costs to export lead-acid separators from U.S. and European production facilities to meet growing demand in Asia.

Selling, general and administrative expenses. Selling, general and administrative expenses decreased $8.7 million in fiscal 2012 compared to fiscal 2011, primarily due to a $13.8 million decrease in performance-based incentive compensation expense and $3.2 million lower amortization expense, partially offset by a $7.0 million increase in stock-based compensation expense. Selling, general and administrative expenses were 17.3% of consolidated net sales in fiscal 2012 and 17.4% in fiscal 2011.

Segment operating income. Segment operating income, which excludes stock-based compensation and certain non-recurring and other costs, was $158.1 million, a decrease of $41.3 million, or 20.7%, from fiscal 2011. Segment operating income as a percent of net sales was 22.0% for fiscal 2012 compared to 26.1% for fiscal 2011. The decrease in segment operating income and segment operating income margin was the result of lower sales, costs associated with growth investments, including $7.5 million of additional non-cash depreciation expense, and costs to export lead-acid separators from U.S. and European production facilities to meet growing demand in Asia, partially offset by a decline in performance-based incentive compensation expense.

Interest expense. Interest expense for fiscal 2012 increased by $1.6 million from fiscal 2011, primarily resulting from a decrease in capitalized interest due to lower capital expenditures associated with capacity expansion projects.

Income taxes. Income taxes as a percentage of pre-tax income for fiscal 2012 were 30.1% compared to 33.0% for fiscal 2011. The income tax expense recorded in the financial statements fluctuates between years due to the mix of income between the U.S. and foreign jurisdictions taxed at varying rates and a variety of other factors, including state income taxes, changes in estimates of permanent differences and valuation allowances. The mix of earnings between the tax jurisdictions has the most significant impact on the effective tax rate. Each tax jurisdiction has its own set of tax laws and tax rates, and income earned by our subsidiaries is taxed independently by these various jurisdictions. Currently, the applicable statutory income tax rates in the jurisdictions in which we operate range from 0% to 39%.

The components of our effective tax rate are as follows:

                                                 Fiscal 2012     Fiscal 2011
        U.S. federal statutory rate                      35.0 %          35.0 %
        State income taxes                                0.6             1.1
        Mix of income in taxing jurisdictions            (7.6 )          (2.7 )
        Other                                             2.1            (0.4 )

        Total effective tax rate                         30.1 %          33.0 %

Fiscal 2011 compared with fiscal 2010

Net sales. Net sales for fiscal 2011 were $763.1 million, an increase of $146.5 million, or 23.8%, from fiscal 2010. The increase was due to higher sales across all segments and the positive impact of foreign currency translation of $13.3 million. By segment, electronics and EDVs increased $70.0 million, transportation and industrial increased $57.2 million and separations media increased $19.3 million.

Gross profit. Gross profit was $322.1 million, an increase of $75.2 million, or 30.5%, from fiscal 2010. Gross profit as a percent of net sales was 42.2% for fiscal 2011 compared to 40.0% for fiscal 2010. The increase in consolidated gross profit and gross profit margin was primarily due to higher . . .