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</LabelSeparator><Level>2</Level><ElementName>us-gaap_ScheduleOfInventoryCurrentTableTextBlock</ElementName><ElementPrefix>us-gaap_</ElementPrefix><IsBaseElement>true</IsBaseElement><BalanceType>na</BalanceType><PeriodType>duration</PeriodType><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsCalendarTitle>false</IsCalendarTitle><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><PreferredLabelRole>terseLabel</PreferredLabelRole><FootnoteIndexer /><Cells><Cell FlagID="0" ContextID="c20130101to20130630" UnitID=""><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText>&lt;div style="font-family: 'Times New Roman', Times, serif; font-size: 10pt;"&gt;&lt;div style="text-align: left; text-indent: 9pt; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;Inventories include the following:&lt;/div&gt;&lt;div&gt;&lt;br /&gt;&lt;/div&gt;&lt;table cellpadding="0" cellspacing="0" style="width: 100%; font-family: 'Times New Roman', Times, serif; font-size: 10pt;"&gt;&lt;tr&gt;&lt;td style="width: 72.6%; vertical-align: bottom;"&gt;&lt;div style="text-align: left; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;&amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td style="width: 1.67%; vertical-align: bottom;"&gt;&lt;div style="text-align: right; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;&amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td colspan="2" style="border-bottom: #000000 2px solid; width: 10.33%; vertical-align: bottom;"&gt;&lt;div style="text-align: right; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;June 30, 2013&lt;/div&gt;&lt;/td&gt;&lt;td style="width: 1.67%; vertical-align: bottom;"&gt;&lt;div style="text-align: left; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;&amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td style="width: 1.67%; vertical-align: bottom;"&gt;&lt;div style="text-align: right; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;&amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td colspan="2" style="border-bottom: #000000 2px solid; width: 10.4%; vertical-align: bottom;"&gt;&lt;div style="text-align: center; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;December 31, 2012&lt;/div&gt;&lt;/td&gt;&lt;td style="width: 1.67%; vertical-align: bottom;"&gt;&lt;div style="text-align: left; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;&amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="width: 72.6%; vertical-align: bottom;"&gt;&lt;div style="text-align: left; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;&amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td style="width: 1.67%; vertical-align: bottom;"&gt;&lt;div style="text-align: left; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;&amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td colspan="6" style="width: 24.07%; vertical-align: bottom;"&gt;&lt;div style="text-align: center; font-style: italic; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;(thousands of dollars)&lt;/div&gt;&lt;/td&gt;&lt;td style="width: 1.67%; vertical-align: bottom;"&gt;&lt;div style="text-align: left; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;&amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr style="background-color: #cceeff;"&gt;&lt;td style="width: 72.6%; vertical-align: bottom;"&gt;&lt;div style="text-align: left; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;Raw material&lt;/div&gt;&lt;/td&gt;&lt;td style="width: 1.67%; vertical-align: bottom;"&gt;&lt;div style="text-align: left; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;&amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td style="width: 1.67%; vertical-align: bottom;"&gt;&lt;div style="text-align: left; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;$&lt;/div&gt;&lt;/td&gt;&lt;td style="width: 8.67%; vertical-align: bottom;"&gt;&lt;div style="text-align: right; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;3,740&lt;/div&gt;&lt;/td&gt;&lt;td style="width: 1.67%; vertical-align: bottom;"&gt;&lt;div style="text-align: left; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;&amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td style="width: 1.67%; vertical-align: bottom;"&gt;&lt;div style="text-align: left; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;&amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td style="width: 1.67%; vertical-align: bottom;"&gt;&lt;div style="text-align: left; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;$&lt;/div&gt;&lt;/td&gt;&lt;td style="width: 8.74%; vertical-align: bottom;"&gt;&lt;div style="text-align: right; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;3,591&lt;/div&gt;&lt;/td&gt;&lt;td style="width: 1.67%; vertical-align: bottom;"&gt;&lt;div style="text-align: left; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;&amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr style="background-color: #ffffff;"&gt;&lt;td style="width: 72.6%; vertical-align: bottom;"&gt;&lt;div style="text-align: left; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;Petrochemical products&lt;/div&gt;&lt;/td&gt;&lt;td style="width: 1.67%; vertical-align: bottom;"&gt;&lt;div style="text-align: left; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;&amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td style="border-bottom: #000000 2px solid; width: 1.67%; vertical-align: bottom;"&gt;&lt;div style="text-align: left; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;&amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td style="border-bottom: #000000 2px solid; width: 8.67%; vertical-align: bottom;"&gt;&lt;div style="text-align: right; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;8,576&lt;/div&gt;&lt;/td&gt;&lt;td style="width: 1.67%; vertical-align: bottom;"&gt;&lt;div style="text-align: left; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;&amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td style="width: 1.67%; vertical-align: bottom;"&gt;&lt;div style="text-align: left; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;&amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td style="border-bottom: #000000 2px solid; width: 1.67%; vertical-align: bottom;"&gt;&lt;div style="text-align: left; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;&amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td style="border-bottom: #000000 2px solid; width: 8.74%; vertical-align: bottom;"&gt;&lt;div style="text-align: right; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;6,249&lt;/div&gt;&lt;/td&gt;&lt;td style="width: 1.67%; vertical-align: bottom;"&gt;&lt;div style="text-align: left; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;&amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr style="background-color: #cceeff;"&gt;&lt;td style="width: 72.6%; vertical-align: bottom;"&gt;&lt;div style="text-align: left; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;Total inventory&lt;/div&gt;&lt;/td&gt;&lt;td style="width: 1.67%; vertical-align: bottom;"&gt;&lt;div style="text-align: left; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;&amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td style="border-bottom: #000000 4px double; width: 1.67%; vertical-align: bottom;"&gt;&lt;div style="text-align: left; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;$&lt;/div&gt;&lt;/td&gt;&lt;td style="border-bottom: #000000 4px double; width: 8.67%; vertical-align: bottom;"&gt;&lt;div style="text-align: right; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;12,316&lt;/div&gt;&lt;/td&gt;&lt;td style="width: 1.67%; vertical-align: bottom;"&gt;&lt;div style="text-align: left; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;&amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td style="width: 1.67%; vertical-align: bottom;"&gt;&lt;div style="text-align: left; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;&amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td style="border-bottom: #000000 4px double; width: 1.67%; vertical-align: bottom;"&gt;&lt;div style="text-align: left; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;$&lt;/div&gt;&lt;/td&gt;&lt;td style="border-bottom: #000000 4px double; width: 8.74%; vertical-align: bottom;"&gt;&lt;div style="text-align: right; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;9,840&lt;/div&gt;&lt;/td&gt;&lt;td style="width: 1.67%; vertical-align: bottom;"&gt;&lt;div style="text-align: left; font-family: Times New Roman; color: #000000; font-size: 10pt;"&gt;&amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;div&gt;&lt;br /&gt;&lt;/div&gt;&lt;/div&gt;</NonNumbericText><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat></Cell></Cells><ElementDataType>nonnum:textBlockItemType</ElementDataType><SimpleDataType>na</SimpleDataType><ElementDefenition>Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.</ElementDefenition><ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef

 -Publisher SEC

 -Name Regulation S-X (SX)

 -Number 210

 -Section 2

 -Paragraph 6

 -Subparagraph a,b,c

 -Article 5



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