ISO 14678:2005 pdf free download.Adhesives — Determination of resistance to flow (sagging).
ISO 14678:2005 describes seven methods for the assessment of the flow characteristics of adhesives after application at room temperature and during cure, by the measurement of sagging. These methods may be used both for specifying an adhesive and for quality control purposes.
When an adhesive joint is prepared, it is important that the applied adhesive does not flow away from the area of the joint Flow can occur before the joint has been assembled, e.g. before solvent or water has evaporated, or after the joint has been closed, but before the adhesive has set, e.g. during the curing, solidification, or drying process.
The flow of an applied adhesive will be influenced by the stress applied and the duration and temperature of the bonding process. The extent of flow of an adhesive will also be influenced by the surface energies involved and the degree of roughness of the adherents. The occurrence of flow under gravity is called sagging (see Clause 3).
This European Standard describes three types of test for the assessment of sagging In the first type of test, which simulates the conditions before joint assembly, the extent of flow of an adhesive down a surface which is either vertical (Methods 1, 2 and 3) or at 60 to the horizontal(Method 4 )is measured. In the second type of test, which simulates conditions after assembly(Methods 5 and 6)， the flow of adhesive from a hole or slot is observed. Th third type of test simulates conditions ring the cure cycle for structural film adhesives (Method 7).The method appropriate to the type of adhesive and its consistency should be selected.
2 Normative references
2 Normative references
EN 923: 1998. Adhesives- Terms and definitions;
EN 1067, Adhesives-Examination and preparation of samples for testing;
13887, Structural Adhesives -Guidelines for surface preparation of metals and plastics prior to adhesive bonding;
EN ISO 15605, Adhesives-Sampling (ISO 15605: 2000);
5 Sampling
Take a sample of the product to be tested in accordance with EN ISO 15605 Examine and prepare this sample for testing in accordance with EN 1067, where applicable, depending on which of the seven test methods is to be emploved.
6 Safet
Persons using this standard shall be familiar with normal laboratory practice.
This standard does not purport to address all the safety problems, if any, associated with its use.
It is responsibility of the user to establish safety and health practices and to ensure compliance with any European and national regulatory conditions.