GB/T 8810-2005 PDF English
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GB/T 8810: Historical versions
| Standard ID | USD | BUY PDF | Delivery | Standard Title (Description) | Status |
| GB/T 8810-2005 | 155 | Add to Cart | Auto, 9 seconds. | Determination of water absorption of rigid cellular plastics | Valid |
| GB/T 8810-1988 | 319 | Add to Cart | 3 days | Test method for water absorption of rigid cellular plastics | Obsolete |
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GB/T 8810-2005: Determination of water absorption of rigid cellular plastics
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT8810-2005GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 83.100 G 32 Replacing GB/T 8810-1988 Determination of water absorption of rigid cellular plastics (ISO 2896.2001, Rigid cellular plastics - Determination of water absorption, MOD) Issued on: NOVEMBER 17, 2005 Implemented on: MAY 01, 2006 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of PRC; National Standardization Administration.
Table of Contents
Foreword... 3 1 Scope... 5 2 Normative references... 5 3 Principle... 5 4 Immersion solution... 5 5 Test apparatus... 5 6 Specimens... 6 7 Test method... 8 8 Correction for swelling and cut surface volume... 9 9 Results presentation... 11 10 Precision and accuracy... 12 11 Test report... 13 Appendix A (Normative) Determination of average pore diameter... 15 Appendix B (Informative) Comparison of clause numbers in this standard with those in ISO 2896.2001... 18 Appendix C (Informative) Technical differences between this standard and ISO 2896.2001 and their reasons... 19Foreword
This standard modifies and adopts ISO 2896.2001 "Rigid cellular plastics - Determination of water absorption". The main differences between this standard and ISO 2896.2001 are as follows. - DELETE the phrase "unless otherwise stated" in the test environment; - ADD the accuracy of volume measurement "V0 accurate to 0.1 cm3"; - USE the sentence "Remove the specimen from the water and remeasure the dimensions immediately; wipe off surface moisture with filter paper before measurement" to replace that "Remove the specimen from the water and remeasure the dimensions within 4 hours of removal". The relevant technical differences are incorporated into the text and marked with a vertical single line in the margin of the clauses to which they pertain. A summary of these technical differences and their reasons is provided in Appendix C for reference. This standard replaces GB/T 8810-1988 "Test method for water absorption of rigid cellular plastics". The main changes, as compared to GB/T 8810-1988, are as follows. - CHANGE the standard name; - ADD a foreword; - INCLUDE the Appendix B in the main text of the standard; - DELETE the test condition "water temperature (23 ± 2) °C"; - CHANGE the phrase "Accurate to 0.01 g" for the balance and weighing to "Accurate to 0.1 g"; - ADD that "V0 accurate to 0.1 cm3"; - ADD the instructions for volume measurement after immersion; - ADD the precision; - ADD the clauses regarding uncertain accuracy; - ADD the derivation of the formula for calculating the average bubble diameter D; - CHANGE the phrase "Specimen volume not greater than 500 cm3" in the cross- section bubble volume correction to "Specimen volume not less than 500 cm3"; Determination of water absorption of rigid cellular plastics1 Scope
This standard specifies the method for determining the water absorption rate of rigid cellular plastics. by measuring the buoyancy of the sample after immersion in water for 50 mm for 96 h. It specifies the corrections for sample volume change and volume correction for the pores on the cut surface of the sample.2 Normative references
The provisions in following documents become the provisions of this Standard through reference in this Standard. For the dated references, the subsequent amendments (excluding corrections) or revisions do not apply to this Standard; however, parties who reach an agreement based on this Standard are encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies. GB/T 2918-1998 Plastics. Standard atmospheres for conditioning and testing (idt ISO 291.1997) GB/T 6342-1996 Cellular plastics and rubbers - Determination of linear dimensions (idt ISO 1923.1981)3 Principle
The water absorption rate of a material is determined, by measuring the buoyancy of a specimen immersed in distilled water for a certain period of time.4 Immersion solution
Distilled water that has been left to stand for at least 48 hours after distillation.5 Test apparatus
5.1 Balance, capable of suspending a wire mesh cage, accurate to 0.1 g. 5.2 Mesh cage, made of stainless steel, large enough to hold the specimen, with a weight at the bottom to counteract the specimen's buoyancy, and a hanger at the top for attaching to a balance (see Figure 1). 5.3 Cylindrical container, at least 250 mm in diameter and 250 mm in height. 5.4 Low-permeability plastic film, such as polyethylene film. 5.5 Slicer, capable of cutting sample slices to a thickness of 0.1 mm ~ 0.4 mm (see Figure 2). 5.6 Slide carrier, two slides glued together with adhesive tape to form a leaf shape, with a transparent plastic sheet printed with standard graduations (30 mm in length) for calculating coordinates placed in the middle (see Figure 3). 5.7 Projector. A general-purpose 35 mm slide projector suitable for 50 mm × 50 mm standard slides, or a projection microscope with a standard scale.6 Specimens
6.1 Specimen quantity Not less than 3 pcs. 6.2 Dimensions The length is 150 mm, width is 150 mm, volume is not less than 500 cm3.For products with natural or composite skins, the specimen thickness is the product thickness; for products with a thickness greater than 75 mm and without a skin, the specimen shall be processed to a thickness of 75 mm; the parallelism tolerance between the two planes shall not exceed 1%. 6.3 Specimen preparation and conditioning Figure 3 -- Slide mounting device Specimens are prepared by mechanical cutting. The specimen surface shall be smooth, flat, free of powder. Place the specimen in a desiccator at room temperature; weigh it every 12 hours, until the difference between two consecutive weighing is no greater than 1% of the average value.7 Test method
7.1 Adjust the test environment to (23 ± 2) °C and (50 ± 5)% relative humidity according to GB/T 2918. 7.2 Weigh the dried specimen mass (m1) to an accuracy of 0.1 g. 7.3 Measure the linear dimension of the specimen according to GB/T 6342 to calculate V0, accurate to 0.1 cm3. 7.4 Pour distilled water into the cylindrical container under test conditions. 7.5 Immerse the mesh cage in water; remove air bubbles from its surface; hang it on a balance; weigh its apparent mass (m2), accurate to 0.1 g. 7.6 Place the specimen into the mesh cage; re-immerse it in water, ensuring the top surface of the specimen is approximately 50 mm below the water surface; remove air bubbles from the mesh cage and sample surface using a soft brush or agitation. 7.7 Cover the cylindrical container with a low-permeability plastic film. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
