Phone Us

(936) 273-3300

Mail Us

epcon@epconlp.com

Industries Served

Home Industries Served

Share

Epcon LP has a long history of being innovative in customizing thermal oxidizers, industrial ovens, furnaces, and finishing systems to meet the demanding needs of clients from every industry.

QUICK CONTACT

“Discover how EPCONs products can improve your company efficiency”

OR
if you have specific expectations, get a detailed quote

Top
SKIP
THE LINE
Interested in saving yourself a few hours worth of critical technical comparison?
Looking for information about:
Your e-mail address
We do this each and every day. Allow us to explain your options, and together we'll find what system works best for you.
APPLICATION
Please submit your information to download our application PDF.
QUICK CONTACT

                <div class='gf_browser_safari gf_browser_iphone gform_wrapper' id='gform_wrapper_13' ><a id='gf_13' class='gform_anchor' ></a><form method='post' enctype='multipart/form-data' target='gform_ajax_frame_13' id='gform_13'  action='/industries_served/#gf_13'>
                        <div class='gform_body'><ul id='gform_fields_13' class='gform_fields top_label form_sublabel_below description_below'><li id='field_13_1' class='gfield gfield_contains_required field_sublabel_below field_description_below gfield_visibility_visible' ><label class='gfield_label' for='input_13_1' >Name<span class='gfield_required'>*</span></label><div class='ginput_container ginput_container_text'><input name='input_1' id='input_13_1' type='text' value='' class='medium'  tabindex='1'  placeholder='Name *' aria-required="true" aria-invalid="false" /></div></li><li id='field_13_5' class='gfield gfield_contains_required field_sublabel_below field_description_below gfield_visibility_visible' ><label class='gfield_label' for='input_13_5' >Company<span class='gfield_required'>*</span></label><div class='ginput_container ginput_container_text'><input name='input_5' id='input_13_5' type='text' value='' class='medium'  tabindex='2'  placeholder='Company *' aria-required="true" aria-invalid="false" /></div></li><li id='field_13_2' class='gfield gfield_contains_required field_sublabel_below field_description_below gfield_visibility_visible' ><label class='gfield_label' for='input_13_2' >Email *<span class='gfield_required'>*</span></label><div class='ginput_container ginput_container_email'>
                            <input name='input_2' id='input_13_2' type='text' value='' class='medium' tabindex='3'   placeholder='Email *'/>
                        </div></li><li id='field_13_3' class='gfield gfield_contains_required field_sublabel_below field_description_below gfield_visibility_visible' ><label class='gfield_label' for='input_13_3' >Phone<span class='gfield_required'>*</span></label><div class='ginput_container ginput_container_phone'><input name='input_3' id='input_13_3' type='text' value='' class='medium' tabindex='4'  placeholder='Phone *' aria-required="true" aria-invalid="false" /></div></li><li id='field_13_4' class='gfield field_sublabel_below field_description_below gfield_visibility_visible' ><label class='gfield_label' for='input_13_4' >Comments</label><div class='ginput_container ginput_container_textarea'><textarea name='input_4' id='input_13_4' class='textarea medium' tabindex='5'  placeholder='Comments'  aria-invalid="false"   rows='10' cols='50'></textarea></div></li>
                            </ul></div>
        <div class='gform_footer top_label'> <input type='submit' id='gform_submit_button_13' class='gform_button button' value='SEND' tabindex='6' onclick='if(window["gf_submitting_13"]){return false;}  window["gf_submitting_13"]=true;  ' onkeypress='if( event.keyCode == 13 ){ if(window["gf_submitting_13"]){return false;} window["gf_submitting_13"]=true;  jQuery("#gform_13").trigger("submit",[true]); }' /> <input type='hidden' name='gform_ajax' value='form_id=13&amp;title=&amp;description=&amp;tabindex=1' />
            <input type='hidden' class='gform_hidden' name='is_submit_13' value='1' />
            <input type='hidden' class='gform_hidden' name='gform_submit' value='13' />
            
            <input type='hidden' class='gform_hidden' name='gform_unique_id' value='' />
            <input type='hidden' class='gform_hidden' name='state_13' value='WyJbXSIsImY3NjA2Yjk4NzU1M2JhYTJlZDFiYmFkZTU3MWMxMTlmIl0=' />
            <input type='hidden' class='gform_hidden' name='gform_target_page_number_13' id='gform_target_page_number_13' value='0' />
            <input type='hidden' class='gform_hidden' name='gform_source_page_number_13' id='gform_source_page_number_13' value='1' />
            <input type='hidden' name='gform_field_values' value='' />
            
        </div>
                        </form>
                        </div>
                <iframe style='display:none;width:0px;height:0px;' src='about:blank' name='gform_ajax_frame_13' id='gform_ajax_frame_13'>This iframe contains the logic required to handle AJAX powered Gravity Forms.</iframe>
                <script type='text/javascript'>jQuery(document).ready(function($){gformInitSpinner( 13, 'http://www.epconlp.com/wp-content/plugins/gravityforms/images/spinner.gif' );jQuery('#gform_ajax_frame_13').load( function(){var contents = jQuery(this).contents().find('*').html();var is_postback = contents.indexOf('GF_AJAX_POSTBACK') >= 0;if(!is_postback){return;}var form_content = jQuery(this).contents().find('#gform_wrapper_13');var is_confirmation = jQuery(this).contents().find('#gform_confirmation_wrapper_13').length > 0;var is_redirect = contents.indexOf('gformRedirect(){') >= 0;var is_form = form_content.length > 0 && ! is_redirect && ! is_confirmation;if(is_form){jQuery('#gform_wrapper_13').html(form_content.html());if(form_content.hasClass('gform_validation_error')){jQuery('#gform_wrapper_13').addClass('gform_validation_error');} else {jQuery('#gform_wrapper_13').removeClass('gform_validation_error');}setTimeout( function() { /* delay the scroll by 50 milliseconds to fix a bug in chrome */ jQuery(document).scrollTop(jQuery('#gform_wrapper_13').offset().top); }, 50 );if(window['gformInitDatepicker']) {gformInitDatepicker();}if(window['gformInitPriceFields']) {gformInitPriceFields();}var current_page = jQuery('#gform_source_page_number_13').val();gformInitSpinner( 13, 'http://www.epconlp.com/wp-content/plugins/gravityforms/images/spinner.gif' );jQuery(document).trigger('gform_page_loaded', [13, current_page]);window['gf_submitting_13'] = false;}else if(!is_redirect){var confirmation_content = jQuery(this).contents().find('#gforms_confirmation_message_13').html();if(!confirmation_content){confirmation_content = contents;}setTimeout(function(){jQuery('#gform_wrapper_13').replaceWith('<' + 'div id=\'gforms_confirmation_message_13\' class=\'gform_confirmation_message_13 gforms_confirmation_message\'' + '>' + confirmation_content + '<' + '/div' + '>');jQuery(document).scrollTop(jQuery('#gforms_confirmation_message_13').offset().top);jQuery(document).trigger('gform_confirmation_loaded', [13]);window['gf_submitting_13'] = false;}, 50);}else{jQuery('#gform_13').append(contents);if(window['gformRedirect']) {gformRedirect();}}jQuery(document).trigger('gform_post_render', [13, current_page]);} );} );</script><script type='text/javascript'> if(typeof gf_global == 'undefined') var gf_global = {"gf_currency_config":{"name":"U.S. Dollar","symbol_left":"$","symbol_right":"","symbol_padding":"","thousand_separator":",","decimal_separator":".","decimals":2},"base_url":"http:\/\/www.epconlp.com\/wp-content\/plugins\/gravityforms","number_formats":[],"spinnerUrl":"http:\/\/www.epconlp.com\/wp-content\/plugins\/gravityforms\/images\/spinner.gif"};jQuery(document).bind('gform_post_render', function(event, formId, currentPage){if(formId == 13) {if(typeof Placeholders != 'undefined'){
                        Placeholders.enable();
                    }if(!/(android)/i.test(navigator.userAgent)){jQuery('#input_13_3').mask('(999) 999-9999').bind('keypress', function(e){if(e.which == 13){jQuery(this).blur();} } );}} } );jQuery(document).bind('gform_post_conditional_logic', function(event, formId, fields, isInit){} );</script><script type='text/javascript'> jQuery(document).ready(function(){jQuery(document).trigger('gform_post_render', [13, 1]) } ); </script>
<div class="to-hide"><p>
OR,
<br>
if you have specific expectations,
<br>
<a class="red" href="http://www.epconlp.com/get-a-quote/">get a detailed quote !</a>
</div>
We will review applications on a rolling basis and will contact you if we feel your qualifications match our current needs.
Download our application PDF then email completed applications to careers@epconlp.com or feel free to drop off in person at our Plant location in the Woodlands.
DOWNLOAD