美国黄色片一区二区三区,欧美韩日亚洲影视在线视频,国产人妻大战黑人20p,免费无码又爽又刺激高潮的视频免费 ,国产在线丝袜精品一区免费,国禁国产you女视频网站,少女たちよ在线观看动漫4,免费啪啪视频一区

        Skill requirements for fireproof glass

        2021-06-24 3399

        The fire-resistant function of fire-proof glass for construction is obtained by embedding the fire-proof glass directly in the wall hole or combined with the structure, and then embedded in the wall hole to make components according to gbl2513. It includes the determination of fire-resistant integrity, fire-resistant and heat insulation and thermal radiation intensity. The temperature of the thermal insulation surface is used as the criterion.

        防火玻璃

        According to gb15763 1-2009 (according to the rules of safety glass and fire-proof glass for construction), fire-proof glass for construction is divided into class A (fire-proof glass satisfying the requirements of fire integrity and fire insulation) and class C (fire-proof glass satisfying the requirements of fire integrity). According to the fire resistance rating, the three types of fireproof glass can be divided into grade I (≥ 90min), grade II (≥ 60min), grade III (≥ 45min) and grade IV (≥ 30min). Fire resistance integrity -- refers to the flame on the back fire surface of the test piece and continues to burn for 10s or more; During the experiment, when the flame or gas of the test piece appears from the holes and other gaps, the ignition test of the cotton pad shall be carried out. If the cotton pad is ignited, it indicates that the test piece has lost its integrity (if the test piece collapses during the experiment, the manufacturer of the raw material of the fire-proof liquid is the same, it indicates that the test piece has lost its integrity).

        Fire resistance and thermal insulation -- refers to the temperature rise of single point at the temperature measuring point on the back fire surface of the test piece of 180 ℃ and uniform temperature rise of 140 ℃.

        Article source: fireproof glasshttp://www.wan-xin.net/


        主站蜘蛛池模板: 美腿丝袜美腿国产在线| 国产高清在线精品一区在线| 日本高清色惰www在线视频| 一区二区在线亚洲av蜜桃| 亚洲天堂中文| 国产做a爰片久久毛片a片| 加勒比在线中文字幕一区二区| 亚洲欧美日韩天堂一区二区| 久久亚洲精品国产精品婷婷| 国产精品免费久久久免费| 亚洲男女在线| 国产男生午夜福利免费网站| 欧美成人高清手机在线视频| 久久精品国产亚洲av成人| 欧美综合自拍亚洲综合百度| 亚洲不卡av不卡一区二区| ww污污污网站在线看com| 在线不卡免费视频| 在线一级毛片| 国产亚洲精品hd网站| 国产天堂一区二区三区四区| 韩国三级大全久久网站| 男人的天堂一区av在线| 一本大道香蕉久中文在线播放| 黄色三级视频中文字幕| 日产精品一区二区三区免费| 国产成人精品a视频| 亚洲欧美综合区自拍另类| 免费人成视频欧美| 亚洲一区二区国产日韩| 国产呦精品一区二区三区网站| 亚洲欧美在线精品一区二区| A亚洲VA欧美VA国产综合| 日本不卡一区二区高清中文| 本道无码一区二区久久激情| 激情五月开心综合亚洲| 99久久无码私人网站| 国产综合一区二区三区av| 亚洲AV无码乱码1区久久| 国产av一区二区三区国产精品| 亚洲精品国产成人7777|