方正度是材料边缘或角偏离直角的程度，用于衡量板材构件在其平面内两端的方正程度。具体定义为距离顶点500毫米处的直角尺与相邻两个角点连线之间的距离，或板材对角线长度差与对角线长度的比值。该指标反映板材相邻边之间的角度与直角（90度）的偏差程度。
| 标准号 & 类别 | 标准名称 | 发布 |
|---|---|---|
| ASTM C550-15 Test Method |
Standard Test Method for Measuring Trueness and Squareness of Rigid Block and Board Thermal Insulation
|
2015 美国材料与试验协会 |
| ASTM C550-26 试验 |
Standard Test Method for Measuring Trueness and Squareness of Rigid Block and Board Thermal Insulation
|
2026-03-01 美国材料与试验协会 |
| BS EN 324-2:1993(1999) 试验 |
Wood - based panels — Determination of dimensions of boards — Part 2 : Determination of squareness and edge straightness
木质板材 |
1999-01-01 英国标准学会 |
| BS EN 991:1996(1999) 试验 |
开放式结构蒸压加气混凝土或轻骨料混凝土预制钢筋构件尺寸的测定 Determination of the dimensions of prefabricated reinforced components made of autoclaved aerated concrete or lightweight aggregate concrete with open structure
|
1999-01-01 英国标准学会 |
| DIN EN 1529:2020 规范标准 |
Door leaves - Height, width, thickness and squareness - Tolerance classes; German and English version prEN 1529:2020
门扇 |
2020-11-01 德国标准化学会 |
| DIN EN 17539:2020 试验标准 |
Modular mechanical locked floor coverings (MMF) - Determination of geometrical characteristics; German and English version prEN 17539:2020
直度 |
2020-07-01 德国标准化学会 |
| DIN EN ISO 24342 E:2017-07 试验标准 |
弹性和纺织地板覆盖物 瓷砖边长, 边缘平直度和直角度的测定（草案） Determination of edge length, edge straightness and squareness of ceramic tiles for resilient and textile floor coverings (draft)
弹性地板砖 |
2017-07 德国标准化学会 |
| IRAM 1741:1997 试验 |
Thermal Insulating Materials. Mineral Wool. Determination of Dimensions and Squareness.
尺寸测定 矿物棉 |
1997-06-06 阿根廷标准化研究所 |
| IRAM 9702:2005 试验 |
Wood-based panels. Determination of squareness and edge straightness.
|
2005-05-04 阿根廷标准化研究所 |
| ISO 6443:2005 试验 |
Door leaves - Method for measurement of height, width, thickness and squareness
测量仪器 门扇 |
2005-10 国际标准化组织 |
| ISO 9366:2001 试验 |
集成（凝聚）软木弹性地砖片 尺寸和边缘的平直度和垂直度的测定 Agglomerated cork floor tiles - Determination of dimensions and deviation from squareness and from straightness of edges
|
2001-05 国际标准化组织 |
| ISO 9426:2003 试验 |
Wood-based panels - Determination of dimensions of panels
木质板材 |
2003-06 国际标准化组织 |
| JC/T 411-2007 规范 |
Cement-bonded particle-board reinforced with fibrous wood particles
平直度 |
2007-09-22 行业标准-建材 |
| LST EN 17539:2021 试验 |
Modular mechanical locked floor coverings (MMF) - Determination of geometrical characteristics
|
2021-10-29 立陶宛标准局 |
| SS-EN 17539:2021 试验标准 |
Modular mechanical locked floor coverings (MMF) - Determination of geometrical characteristics
|
2021 瑞典标准研究所 |
| SS-EN 951:1999 试验 |
Door leaves - Method for measurement of height, width, thickness and squareness
门扇 |
1999-01-15 瑞典标准研究所 |
| SS-EN ISO 24342:2012 试验标准 |
弹性和纺织地板覆盖物 瓷砖边长、边缘、直线度和方形度的测定（ISO 24342:2007） Resilient and textile floor-coverings - Determination of side length, edge, straightness and squareness of tiles (ISO 24342:2007)
直度 |
2012 瑞典标准研究所 |
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