求翻译：但由于实际生产的玻化微珠因烧结窑炉的可控性不高或原料质量的不均衡性等原因，存在表面玻化层的厚度和表面覆盖率难以控制，闭孔率低，密度较大，容重通常都大于膨胀珍珠岩，使配制的保温砂浆的干密度较大，从而影响到保温砂浆的实际保温性能。是什么意思？

However, the actual production of sintered glass beads due to the controllability of the furnace is not high, or the uneven quality of raw material and other reasons, there is a surface of the glass layer thickness and surface coverage is difficult to control, closed-cell low density than large, bul

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But because produces actually because Bolivia melts the micro bead the agglutination kiln stove controllability not high or raw material quality reasons and so on disproportionality, existence surface Bolivia melts the level thickness and the superficial coverage fraction controls with difficulty, t

But due to actual production of glass of micro-Pearl due to sintering kiln furnace of may controlled sexual does not high or raw materials quality of does not balanced sexual, causes, exists surface glass of layer of thickness and surface coverage difficult to control, closed hole rate low, density

However, the actual production of sintered glass beads due to the controllability of the furnace is not high, or the uneven quality of raw material and other reasons, there is a surface of the glass layer thickness and surface coverage is difficult to control, closed-cell low density than large, bul