{"id":28024,"date":"2026-09-21T05:37:02","date_gmt":"2026-09-21T05:37:02","guid":{"rendered":"https:\/\/purepack-kh.com\/?p=28024"},"modified":"2026-09-21T05:38:55","modified_gmt":"2026-09-21T05:38:55","slug":"how-to-tell-if-plastic-is-pp-or-pe","status":"publish","type":"post","link":"https:\/\/purepack-kh.com\/how-to-tell-if-plastic-is-pp-or-pe\/","title":{"rendered":"How to Tell If Plastic Is PP or PE?"},"content":{"rendered":"<p>In this article, you will learn about the major difference between PP and PE plastics, how to easily distinguish between them, and how to test your plastics for better results. You will also be guided on what you need to know before ordering from foreign plastic companies.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_88 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/purepack-kh.com\/how-to-tell-if-plastic-is-pp-or-pe\/#1_PP_vs_PE_How_to_Know_the_Difference\" >1.\u00a0PP vs. PE: How to Know\u00a0the Difference?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/purepack-kh.com\/how-to-tell-if-plastic-is-pp-or-pe\/#11_Identify_the_Plastic_Identification_Code\" >1.1.\u00a0Identify the Plastic Identification Code<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/purepack-kh.com\/how-to-tell-if-plastic-is-pp-or-pe\/#12_Evaluate_the_Flexibility_and_Rigidity\" >1.2.\u00a0Evaluate the Flexibility and Rigidity<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/purepack-kh.com\/how-to-tell-if-plastic-is-pp-or-pe\/#13_Evaluate_the_Surface_and_Appearance\" >1.3.\u00a0Evaluate\u00a0the Surface and Appearance<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/purepack-kh.com\/how-to-tell-if-plastic-is-pp-or-pe\/#14_Perform_a_Float_Test\" >1.4.\u00a0Perform a Float Test<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/purepack-kh.com\/how-to-tell-if-plastic-is-pp-or-pe\/#15_Consider_the_Melting_Point\" >1.5.\u00a0Consider the Melting Point<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/purepack-kh.com\/how-to-tell-if-plastic-is-pp-or-pe\/#16_Ask_Your_Supplier_for_Material_Documentation\" >1.6.\u00a0Ask Your Supplier for Material Documentation<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/purepack-kh.com\/how-to-tell-if-plastic-is-pp-or-pe\/#17_Use_Laboratory_Testing_for_Important_Orders\" >1.7.\u00a0Use Laboratory Testing for Important Orders<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/purepack-kh.com\/how-to-tell-if-plastic-is-pp-or-pe\/#2_Why_Does_PP_vs_PE_Identification_Matter_to_You\" >2.\u00a0Why Does PP vs. PE Identification Matter to You?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/purepack-kh.com\/how-to-tell-if-plastic-is-pp-or-pe\/#3_Frequently_Asked_Questions\" >3.\u00a0Frequently Asked Questions<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/purepack-kh.com\/how-to-tell-if-plastic-is-pp-or-pe\/#Q1_Is_HDPE_easier_to_distinguish_from_PP_than_LDPE\" >Q1. Is HDPE easier to distinguish from PP than LDPE?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/purepack-kh.com\/how-to-tell-if-plastic-is-pp-or-pe\/#Q2_Can_recycled_PP_and_PE_look_different_from_virgin_material\" >Q2. Can recycled PP and PE look different from virgin material?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/purepack-kh.com\/how-to-tell-if-plastic-is-pp-or-pe\/#Q3Can_additives_change_the_appearance_of_PP_or_PE\" >Q3.Can additives change the appearance of PP or PE?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/purepack-kh.com\/how-to-tell-if-plastic-is-pp-or-pe\/#Q4_Does_PP_feel_different_from_PE_when_folded\" >Q4. Does PP feel different from PE when folded?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/purepack-kh.com\/how-to-tell-if-plastic-is-pp-or-pe\/#Q5_Can_color_help_you_identify_PP_or_PE\" >Q5. Can color help you identify PP or PE?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/purepack-kh.com\/how-to-tell-if-plastic-is-pp-or-pe\/#4_Conclusion\" >4.\u00a0Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"1_PP_vs_PE_How_to_Know_the_Difference\"><\/span>1.\u00a0<strong>PP vs. PE: <\/strong><strong>How to Know<\/strong><strong>\u00a0the Difference?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Both PP and PE are thermoplastics. However, they have different structures and properties.<\/p>\n<p><strong><b>PP<\/b><\/strong>\u00a0refers to\u00a0<strong><b>polypropylene<\/b><\/strong>. It is a light thermoplastic which is known to be stiff, chemically resistant, durable and has decent heat resistance. PP is used for packaging, automotive parts, storage items, reusable containers, sheets and other various industrial purposes.<\/p>\n<p><strong><b>PE<\/b><\/strong>\u00a0refers to<strong><b>\u00a0polyethylene<\/b><\/strong>. This type of plastic is probably one of the most popular in the world. Polyethylene is available in several types: <strong><b>LDPE<\/b><\/strong>, <strong><b>LLDPE<\/b><\/strong>\u00a0and <strong><b>HDPE<\/b><\/strong>. According to the type, PE may be flexible or rigid.<\/p>\n<p>As different types of PE have their own features, you shouldn\u2019t think that all PE materials will act similarly.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-28027\" src=\"https:\/\/purepack-kh.com\/wp-content\/uploads\/2026\/09\/PP-and-PE-1.jpg\" alt=\"PP-and-PE\" width=\"1280\" height=\"720\" srcset=\"https:\/\/purepack-kh.com\/wp-content\/uploads\/2026\/09\/PP-and-PE-1.jpg 1280w, https:\/\/purepack-kh.com\/wp-content\/uploads\/2026\/09\/PP-and-PE-1-768x432.jpg 768w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<h3><span class=\"ez-toc-section\" id=\"11_Identify_the_Plastic_Identification_Code\"><\/span>1.1.\u00a0<strong>Identify the Plastic Identification Code<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Start your analysis at the product marking.<\/p>\n<p>Some plastic products will show you a resin identification code in the form of numbers enclosed in a recycling logo.<\/p>\n<ul>\n<li>PP = #5<\/li>\n<li>HDPE = #2<\/li>\n<li>LDPE\/LLDPE = #4<\/li>\n<\/ul>\n<p>In case you spot a <strong><b>#5 code<\/b><\/strong>, it is usually polypropylene, <strong><b>#2<\/b><\/strong>\u00a0is high-density polyethylene, and <strong><b>#4<\/b><\/strong>\u00a0is low-density polyethylene.<\/p>\n<p>But not all plastic products are accompanied by a recycling logo. Plastic films, custom-made items, and industrial plastics do not always have a code on them.<\/p>\n<p>Keep in mind that a recycling logo will only tell you what type of resin was used for the product, but it may not be enough for you to know its entire composition.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"12_Evaluate_the_Flexibility_and_Rigidity\"><\/span>1.2.\u00a0<strong>Evaluate the Flexibility and Rigidity<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>You can usually determine this at the first stage by touching the plastic.<\/p>\n<p>Polypropylene (PP) tends to be stiffer and more rigid than many common polyethylene (PE) plastics. It is likely to retain its shape well, and will be fairly stiff to the touch.<\/p>\n<p>PE may be more flexible than PP, especially in the form of low density (LDPE) and linear low density (LLDPE). On the other hand, high density (HDPE) is quite stiff.<\/p>\n<p><strong><b>For example<\/b><\/strong>,\u00a0when you are comparing a <a href=\"https:\/\/purepack-kh.com\/corrugated-polypropylene-sheet\/\">PP corrugated sheet<\/a>\u00a0to a PE sheet with the same thickness, the PP sheet will feel relatively stiff despite being light-weight and manageable.<\/p>\n<p>Again, it is just an initial test. Different grades and thicknesses will yield different outcomes.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"13_Evaluate_the_Surface_and_Appearance\"><\/span>1.3.\u00a0<strong>Evaluate<\/strong><strong>\u00a0the Surface and Appearance<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>PP and PE can both be made with smooth, textured, glossy, and matte surfaces. Appearance cannot therefore be used to identify the material alone.<\/p>\n<p>However, if you are familiar with a certain product, you will note differences in:<\/p>\n<ul>\n<li>Texture of the surface<\/li>\n<li>The degree of glossiness<\/li>\n<li>Translucency<\/li>\n<li>Stiffness<\/li>\n<li>Thickness uniformity<\/li>\n<li>Flexibility<\/li>\n<\/ul>\n<p><strong><b>For your information<\/b><\/strong>, PP has a hard, stiff, and shiny surface, giving it a neat look, whereas PE has a soft, flexible, and waxy surface.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"14_Perform_a_Float_Test\"><\/span>1.4.\u00a0<strong>Perform a Float Test<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>In your float test in water, you will realize that PP and PE float because their densities are less than that of water.<\/p>\n<p>In the case of PP, you will observe that PP floats freely having a density of about 0.90-0.91 g\/cm\u00b3.<\/p>\n<p>On the other hand, PE will float having a density of about 0.91-0.97 g\/cm\u00b3.<\/p>\n<p>From the above observations, it is clear that you cannot differentiate between PP and PE using the water float test.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"15_Consider_the_Melting_Point\"><\/span>1.5.\u00a0<strong>Consider the Melting Point<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Another significant difference is the melting properties.<\/p>\n<p>Usually, PP has a greater melting point compared to other grades of PE. The standard melting points are about:<\/p>\n<ul>\n<li>PP: ~160-170\u00b0C<\/li>\n<li>HDPE: ~130-135\u00b0C<\/li>\n<li>LDPE: ~105-115\u00b0C<\/li>\n<\/ul>\n<p>These ranges may vary based on the grade and composition.<\/p>\n<p>In order to examine the melting properties of the plastic, one could perform a controlled thermal analysis in the lab. It is much more accurate than heating the sample on your own.<\/p>\n<p>If you are a distributor who buys a big amount of plastic products, then conducting professional material testing would be a much safer choice than heating the sample.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"16_Ask_Your_Supplier_for_Material_Documentation\"><\/span>1.6.\u00a0<strong>Ask Your Supplier for Material Documentation<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>One of the simplest methods of determining material for foreign purchasers is asking your supplier for documentation.<\/p>\n<p><strong><b>Based on your products and your purchasing needs, you can ask your suppliers for:<\/b><\/strong><\/p>\n<ul>\n<li>Material specification<\/li>\n<li>Technical data sheet (TDS)<\/li>\n<li>Safety data sheet (SDS) where appropriate<\/li>\n<li>Certificate of analysis (COA)<\/li>\n<li>Raw material information<\/li>\n<li>Grade or resin specification<\/li>\n<li>Third party testing results<\/li>\n<\/ul>\n<p>You should also make sure the documentation corresponds to the actual product being supplied.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"17_Use_Laboratory_Testing_for_Important_Orders\"><\/span>1.7.\u00a0<strong>Use Laboratory Testing for Important Orders<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>In case you require a very high level of assurance, laboratory testing is definitely the way to go.<\/p>\n<p><strong><b>Some of the methods available for identifying the polymer include:<\/b><\/strong><\/p>\n<ul>\n<li>FTIR (Fourier-transform infrared spectroscopy)<\/li>\n<li>DSC (Differential Scanning Calorimetry)<\/li>\n<li>Density tests<\/li>\n<li>Thermal analysis<\/li>\n<\/ul>\n<p>The most common way of identifying the chemical composition of a polymer is FTIR while DSC helps in identifying melting point and other thermal properties.<\/p>\n<p>A test of a production sample before shipping in case of an important order may prove beneficial for you.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"2_Why_Does_PP_vs_PE_Identification_Matter_to_You\"><\/span>2.\u00a0<strong>Why Does PP vs. PE Identification Matter to You?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>For you, it is not only a technical issue to classify the material.<\/p>\n<p>You could be ordering PP because your customers require certain characteristics such as rigidity, lightweight, resistance to chemicals, durability, or high temperatures.<\/p>\n<p>If the supplier uses some other material without your consent, it will behave differently.<\/p>\n<p><strong><b>For instance, a client buying PP corrugated sheets will probably have certain needs regarding:<\/b><\/strong><\/p>\n<ul>\n<li>Rigidity of the sheet<\/li>\n<li>Its weight<\/li>\n<li>Resistance to impact<\/li>\n<li>Resistance to chemicals<\/li>\n<li>Folding<\/li>\n<li>Printing<\/li>\n<li>Reusable<\/li>\n<li>High temperatures<\/li>\n<\/ul>\n<p>So it could affect your product quality and your customer satisfaction.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"3_Frequently_Asked_Questions\"><\/span>3.\u00a0<strong>Frequently Asked Questions<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Q1_Is_HDPE_easier_to_distinguish_from_PP_than_LDPE\"><\/span><strong>Q1. Is HDPE easier to distinguish from PP than LDPE?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>In some cases, HDPE may be more easily identifiable because it is usually more stiff and denser than PP. LDPE, on the other hand, is relatively flexible and hence more difficult to identify from some PP materials.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Q2_Can_recycled_PP_and_PE_look_different_from_virgin_material\"><\/span><strong>Q2. Can recycled PP and PE look different from virgin material?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Yes. The recycled plastics will differ in their color, clarity, and surface appearance due to prior handling and contamination. But it does not mean that it can be used for the identification of polymers, since you still need to conduct tests.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Q3Can_additives_change_the_appearance_of_PP_or_PE\"><\/span><strong>Q3.Can additives change the appearance of PP or PE?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Yes. Additives can considerably affect the appearance of both polymers. For example, colored or filled PP will have completely different properties compared to PP in its original form; the same for PE.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Q4_Does_PP_feel_different_from_PE_when_folded\"><\/span><strong>Q4. Does PP feel different from PE when folded?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Yes. PP is often crispier and may not bend easily before making a crease, whereas PE is usually soft and bends easily. Folding films multiple times will help you notice the differences between them more easily.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Q5_Can_color_help_you_identify_PP_or_PE\"><\/span><strong>Q5. Can color help you identify PP or PE?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>No, because the color does not work as an identifying factor for the polymer. These two polymers may be manufactured in different colors by using pigments and masterbatches. Thus, the white, black, transparent, or colored sample may belong to any of the two polymers.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"4_Conclusion\"><\/span>4.\u00a0<strong>Conclusion<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>PP and PE may appear alike, but they are quite different when it comes to their properties. If you want to be sure about what plastic you have, you must verify the resin identification code and properties of the plastic. If you wish to be absolutely certain, you must obtain technical data.<\/p>\n<p>Visit\u00a0<a href=\"https:\/\/purepack-kh.com\/\">Purepack<\/a>\u00a0for more information on PP.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In this article, you will learn about the major difference between PP and PE plastics, how to easily distinguish between them, and how to test your plastics for better results. You will also be guided on what you need to know before ordering from foreign plastic companies. 1.\u00a0PP vs. PE: [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":28027,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-28024","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Tell If Plastic Is PP or PE? 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