| 标准编号 Standard/Code | 标准名称 Standard Title |
| TAPPI T 464 | Water Vapor Transmission Rate of Paper and Paperboard at High Temperature and Humidity |
1.1 This method is for the gravimetric determination of the water vapor transmission rate (WVTR) of sheet materials at 37.8°C (100°F) with an atmosphere of 90% RH on one side and a desiccant on the other.
1.2 It is generally suitable for any material up to 3 mm (1/8 in.) thick, although it may be used with caution for thicker materials if the edges of the specimen are completely sealed.
1.3 For testing at other conditions see TAPPI T 448 “Water Vapor Transmission Rate of Paper and Paperboard at 23°C (73°F) and at 50% RH.”
1.4 This test can be used for both creased and uncreased specimens. See TAPPI T 465 “Static Creasing of Paper for WVT Tests” or TAPPI UM 590 “Creasing of Paperboard for Water Vapor Transmission Rate (WVTR) Testing.”
Test Requirement 测试要求：
水蒸汽透过率
Sample Size 样品数量 / 送样规格: 4pcs
Lead Time / TAT (Turn Around Time) 测试周期: 常规服务 Regular service 7-9 working days
Report Summary 报告摘要:
