1.0Insulation Outlook Magazinehttps://insulation.org/ioInsulation Outlook Magazinehttps://insulation.org/ioHourly Fire Ratings—What’s the Deal?rich600338<blockquote class="wp-embedded-content" data-secret="a3P4YTQhEP"><a href="https://insulation.org/io/articles/hourly-fire-ratings-whats-the-deal/">Hourly Fire Ratings—What’s the Deal?</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://insulation.org/io/articles/hourly-fire-ratings-whats-the-deal/embed/#?secret=a3P4YTQhEP" width="600" height="338" title="“Hourly Fire Ratings—What’s the Deal?” — Insulation Outlook Magazine" data-secret="a3P4YTQhEP" 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);
/* ]]> */
</script>
This primer on fire safety standards (ASTM, UL, and ISO) explains the differences between flame spread, combustibility, and hourly ratings, to help engineers and specifiers make informed decisions to enhance safety in their projects.https://insulation.org/io/wp-content/uploads/sites/3/2026/01/IO251202_01.jpg17881141