ASTM F2865-13(R2021) pdf free download

ASTM F2865-13(R2021) pdf free download.Standard Guide for Classifying the Degrees of Ingress of Dust and Water into a Membrane Switch
1. Scope
1.1 This guide establishes a classification system and refer- ences test methods for verifying the degrees of: 1.1.1 The ingress of dust into the internal layers of a membrane switch. 1.1.2 Ingress ofwater into the internal layers ofa membrane switch. 1.1.3 Where external test methods are referenced, this guide specifies the special conditions that shall be considered in applying these tests to membrane switches and how the results are interpreted. 1.2 This guide references test methods that can be used to establish the ingress classification of a membrane switch. 1.3 This guide utilizes the test methods and reporting structure of IEC 60529 – (Degrees of Protection Provided by Enclosures) modified for membrane switches. 1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Terminology
3.1 Definitions ofTerms Specific to This Standard: 3.1.1 membrane switch, n—a momentary switching device in which at least one contact is on, or made of, a flexible substrate.
4. Classification System
4.1 The ingress classification of a membrane switch is designated by the MSIP code: 4.1.1 MSIP 6 5 A 4.1.1.1 MSIP = Membrane Switch Ingress classification. 4.1.1.2 1st Numeral = Dust Protection Code (see Table 1). 4.1.1.3 2nd Numeral = Water (Liquid) Protection Code (see Table 2). 4.1.1.4 A = If “A” is present then method or media deviates from this guide and is reported. 4.1.2 The MSIP code comprises a series of numerals. Each numeral represents the level of ingress offered by the mem- brane switch to each contaminant. In this guide when address- ing only the 1st or 2nd numeral the other numeral is replaced with an “X” for clarity. For example, MSIP X5 refers only to testing for water ingression. The “X” notation is not used as a final designation. If testing is not completed a “ 0” is used for that numeral (see Table 1 and Table 2). 4.1.3 The numeric designations for dust and water are based on those classified under IEC 60529.
5. Significance and Use
5.1 Ingression protection classifications are widely used by manufacturers for specifying the level of protection offered by enclosures. 5.2 An example of such a classification scheme is IEC 60529. Membrane switch manufacturers are often asked to meet these standards, however the test methods specified within these standards do not address considerations specific to membrane switches. 5.3 The MSIP classification system considers the membrane switch separately from the testing and IP codes used for classifying the enclosure when subject to similar test condi- tions. 5.4 Ingression testing can be useful to identify design deficiencies.
6. Interferences
6.1 The membrane switch shall be tested in a mounted state specified in this guide because this is a classification of the membrane switch only without consideration of the enclosure. 6.2 The length of time between the manufacture of the membrane switch and the performance of the test. 6.3 The temperature at which the test is being conducted.
7. Conditioning
7.1 Unless otherwise specified in a relevant product standard, the test samples for each test shall be in a clean and new condition, and mounted to the testing backer for 24 h. 7.2 The testing backer must be a rigid transparent backer to better observe the ingression of dust or water into the switch. Testing backer with geometries other than flat shall be re- ported. 8. Test Method for Ingress of Dust into a Membrane Switch 8.1 Apparatus: 8.1.1 Dust Chamber: Reference IEC 60529 Section 13.4. 8.1.2 Dust Media: 8.1.2.1 For MSIP5X and MSIP6X : Reference IEC 60529 Section 13.4. 8.1.2.2 MSIP5XA and MSIP6XA: Media to be specified. 8.1.2.3 Mounting Surface—The testing backer must be rigid and transparent and compatible with the mounting adhesive. Testing backer with geometries other than flat shall be re- ported. 8.2 Pre-Test Setup: 8.2.1 Measurements and Process Testing should be con- ducted on switches nearest the weakest point for ingress of dust, such as the first switch cavity adjacent to an external vent channel. 8.2.2 Measure the circuit resistance per Test Method F1680.