1.0RIGAS PLASTIKA S.A.https://rigasplastika.gr/en/rich600338<blockquote class="wp-embedded-content" data-secret="i2q0OrPRdL"><a href="https://rigasplastika.gr/en/the-history-of-polymers/">THE HISTORY OF POLYMERS</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://rigasplastika.gr/en/the-history-of-polymers/embed/#?secret=i2q0OrPRdL" width="600" height="338" title="“THE HISTORY OF POLYMERS” — RIGAS PLASTIKA S.A." data-secret="i2q0OrPRdL" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script type="text/javascript"> /* <![CDATA[ */ /*! This file is auto-generated */ !function(d,l){"use strict";l.querySelector&&d.addEventListener&&"undefined"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!/[^a-zA-Z0-9]/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),o=l.querySelectorAll('blockquote[data-secret="'+t.secret+'"]'),c=new RegExp("^https?:$","i"),i=0;i<o.length;i++)o[i].style.display="none";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute("style"),"height"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):"link"===t.message&&(r=new URL(s.getAttribute("src")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener("message",d.wp.receiveEmbedMessage,!1),l.addEventListener("DOMContentLoaded",function(){for(var e,t,s=l.querySelectorAll("iframe.wp-embedded-content"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute("data-secret"))||(t=Math.random().toString(36).substring(2,12),e.src+="#?secret="+t,e.setAttribute("data-secret",t)),e.contentWindow.postMessage({message:"ready",secret:t},"*")},!1)))}(window,document); //# sourceURL=https://rigasplastika.gr/wp-includes/js/wp-embed.min.js /* ]]> */ </script> Humans have been using natural polymers for many centuries without even knowing they were dealing with macromolecules. Natural polymer products such as egg white, tar, gum arabic were known to the ancient Egyptians and Greeks. In combination with metallic elements, these products were used to prepare coating compositions for walls, burial chambers, etc. Hundreds of […]