GSO ASTM D6341:2021由GSO 发布于 2021-07-01。
GSO ASTM D6341:2021在国际标准分类中归属于: 17.040.99 有关长度和角度测量的其他标准。
GSO ASTM D6341:2021 测定 –34.4 至 60°C(–30 至 140°F)之间塑料板材和塑料板材形状的线性热膨胀系数的标准试验方法1的最新版本是哪一版?
最新版本是 GSO ASTM D6341:2021 。
1.1 This test method covers the determination of the coefficient of linear thermal expansion for plastic lumber and plastic lumber shapes to two significant figures. The determination is made by taking measurements with a caliper at three discrete temperatures. At the test temperatures and under the stresses imposed, the plastic lumber shall have a negligible creep or elastic strain rate, or both, insofar as these properties would significantly affect the accuracy of the measurements. 1.1.1 This test method details the determination of the linear coefficient of thermal expansion of plastic lumber and plastic lumber shapes in their “as manufactured” form. As such, this is a test method for evaluating the properties of plastic lumber or shapes as a product and not a material property test method. 1.2 The thermal expansion of plastic lumber and shapes is composed of a reversible component on which it is possible to superimpose changes in length due to changes in moisture content, curing, loss of plasticizer or solvents, release of stresses, phase changes, voids, inclusions, and other factors. This test method is intended to determine the coefficient of linear thermal expansion under the exclusion of non-linear factors as far as possible. In general, it will not be possible to exclude the effect of these factors completely. For this reason, the test method can be expected to give a reasonable approximation but not necessarily precise determination of the linear coefficient of thermal expansion. 1.3 Plastic lumber and plastic lumber shapes are currently made predominately with recycled plastics where the product is non-homogeneous in the cross-section. However, it is possible that this test method will also be applicable to similar manufactured plastic products made from virgin resins or other plastic composite materials.
取样管直接与吸收瓶连接,其外露于煤气管外至吸收瓶的部分应尽量短,并用热水夹套保温,使取样管中煤气的温度比煤气主管中煤气的温度高5一10C.两只 各 加 30mL甲苯或二甲苯的吸收瓶置于加冰的冷水浴中,保证在取样时吸收液温度不高于100C在加热保温取样管后,置换放散煤气lomina二3.1.2 吸收:按图3连接取样管、吸收瓶和湿式流量计取样管、吸收瓶之间的连接,使用橡胶管或塑料管,管口应尽量互相对接,...
:水温20~25℃ 流量>5L/min 水压>0.1MPa分光器技术指标光栅:中阶梯光栅,52.67 lp/mm,64闪耀角,采用德国肖特公司热膨胀系数接近于零的Zerodur材料做基底,性能更出众棱镜:超纯康宁紫外熔融石英,在170nm处内透过率99.6%波长范围:165nm~900nm焦距:430mm数值孔径:F/8,超高的光通量保证仪器的检出限和灵敏度分辨率:...
用氢氧化钠标准溶液的浓度计算: (5)式中:St,ad-空气干燥煤样中全硫含量,%;V-煤样测定时,氢氧化钠标准溶液的用量,mL;V0-空白测定时,氢氧化钠标准溶液的用量,mL;c-氢氧化钠标准溶液的浓度,mmol/mL;0.0016-硫的毫摩尔质量,g/mmoL;f-校正系数,当St,ad4%时,f=1.05;m-煤样质量,mg。2. ...
04结果与讨论4.1线性相关系数依次测定3.1中氨氮和总磷标准系列溶液,测得的标准谱图见图1,线性回归方程及相关系数见表1。图1氨氮(上)和总磷(下)标准谱图与标准曲线表1 标准工作曲线方程与线性相关系数实验结果表明,氨氮和总磷在0~8mg/L浓度范围内线性关系良好。...
Copyright ©2007-2022 ANTPEDIA, All Rights Reserved
京ICP备07018254号 京公网安备1101085018 电信与信息服务业务经营许可证:京ICP证110310号