BS/EN 16492-2014 pdf download.Paints and varnishes Evaluation of the surface disfigurement caused by fungi and algae on coatings.
This BS/EN 16492 specifies a procedure for the evaluation of the degree of surface disfigurement caused by fungi and algae on coatings.
This European Standard is not applicable for evaluating disfigurements caused by blue stain in service on and in wood surfaces. A scale for the assessment of blue stain of coated and uncoated wood is specified in
EN 152:2011. 8.5.2.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references. the latest edition of the referenced document (including any amendments) applies.
EN ISO 4628-1:2003. Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity and size of defects, and of intensity of uniform changes in appearance — Part 1: General introduction and designation system (ISO 4628-1:2003)
3 Principle
The degree of fungal or algal growth on coatings Is given a numeric rating.
4 Apparatus
4.1 Microscope with a typical magnification of up to x 100 (if necessary)
5 Preparation
The test specimen shall be the flat surface of any exposed test panel or cut from a construction panel. In the case of assessment of building facades one or more defined parts of the surface shall be chosen and described In the test report,
The test specimen shall be examined without wiping, washing or removing any loose surface material.
For better discrimination between fungi and algae the test surface shall be examined under wet conditions.
Dry surfaces shall be wetted by gently spraying with clean water.
Care shall be taken not to add any contamination to the specimen surface.
6 Procedure
Carry out the assessment visually using normal or corrected vision on a defined test surface. Carry out the assessment under good illumination and from a distance less than 1 m.
If contamination of dirt soil is suspected, this shall be confirmed by the use of a microscope (4.1) and taken into consideration when evaluating the entire surface.
Distinguishing dirt from biological disfigurement might be difficult even with the aid of a microscope. To improve precision, the evaluation should be carried out by an experienced operator.
Any fungal oc algal growth observed only on dirt or soil particles that have accumulated on the test specimen shall be reported separately in the test report.
7 Expression of results
The numencal ratings for the intensity (in accordance with Table Al). the quantity (in accordance with Table A,2) and the percentage area (in accordance with Table A.3) of disfigurements caused by fungal or algal growth shall be expressed as indicated In the following examples:
fungal growth: intensity 1. quantity 3. percentage area 2
algal growth: intensity 2, quantity 1, percentage area 1
8 Test report
The test report shall contain at least the following information:
a) all details necessary to identify the product tested:
b) reference to this European Standard (EN 16492:2014);
c) type and origin of the test specimen and its exposure conditions, including whether the inspection is carned out in a laboratory or on-site;
d) statement whether the growth observed is either fungal or algal;
e) numerical contamination rating in accordance with Clause 7;
f) any presence of dirt) soiling;
g) if any growth is observed on dirt or soil only, including an information whether any magnification to inspect the surface was carried out;
h) any deviation from the test procedure described;
i) any unusual features (anomalies) observed during the evaluation;
j) date(s) of the test.BS/EN 16492-2014 pdf download.