ASTM C1248-22

Standard Test Method for Staining of Porous Substrate by Joint Sealants

SIGNIFICANCE AND USE
5.1 Staining of building materials is an aesthetically undesirable occurrence. This test method evaluates the likelihood of a sealant causing an early stain on a porous substrate due to exudation of materials from the sealant. Since this is an accelerated test, it does not necessarily predict that the tested sealants will not stain or discolor porous substrates over longer periods of time.
SCOPE
1.1 This test method covers four types of laboratory tests to determine if a joint sealant has a probability of staining a porous substrate (such as marble, limestone, sandstone, granite, or other similar material). The tests are on compressed samples and include (1) storage under standard laboratory conditions, (2) storage in an oven, and (3) exposure in a fluorescent UV/condensation device, and (4) exposure in a xenon arc device.  
1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.  
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This standard is similar, but not identical, to ISO 16938-1.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 30-Jun-2022
• ICS: 91.100.50 - Binders. Sealing materials
• Technical Committee: C24 - Building Seals and Sealants
• Drafting Committee: C24.40 - Weathering

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: C1248 − 22
Standard Test Method for
1
Staining of Porous Substrate by Joint Sealants
This standard is issued under the fixed designation C1248; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope ering Tests of Nonmetallic Materials
G151 Practice for Exposing Nonmetallic Materials inAccel-
1.1 This test method covers four types of laboratory tests to
erated Test Devices that Use Laboratory Light Sources
determine if a joint sealant has a probability of staining a
G154 Practice for Operating Fluorescent Ultraviolet (UV)
poroussubstrate(suchasmarble,limestone,sandstone,granite,
Lamp Apparatus for Exposure of Nonmetallic Materials
or other similar material).The tests are on compressed samples
G155 Practice for Operating XenonArc LampApparatus for
and include (1) storage under standard laboratory conditions,
Exposure of Materials
(2) storage in an oven, and (3) exposure in a fluorescent
3
2.2 ISO Standard:
UV/condensation device, and (4) exposure in a xenon arc
ISO 16938-1 Buildings and civil engineering works —
device.
Determination of the staining of porous substrates by
1.2 The values stated in SI units are to be regarded as
sealants used in joints — Part 1: Test with compression
standard. The values given in parentheses after SI units are
provided for information only and are not considered standard.
3. Terminology
1.3 This standard does not purport to address all of the
3.1 Definitions:
safety concerns, if any, associated with its use. It is the
3.1.1 Refer to Terminology C717 and G113 for definitions
responsibility of the user of this standard to establish appro-
of terms used in this test method.
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
4. Summary of Test Method
1.4 This standard is similar, but not identical, to ISO
4.1 In this test method standard joint specimens are com-
16938-1.
pressed and clamped at the manufacturer’s rated movement
1.5 This international standard was developed in accor-
capabilityandsubjectedtothefollowingtreatments;(a)fourof
dance with internationally recognized principles on standard-
the specimens are stored at standard conditions while under
ization established in the Decision on Principles for the
compression for up to 28 days; (b) four of the specimens are
Development of International Standards, Guides and Recom-
exposed in an oven while under compression for up to 28 days;
mendations issued by the World Trade Organization Technical
(c) four of the specimens are exposed either in a fluorescent
Barriers to Trade (TBT) Committee.
UV/condensation device or in a xenon arc device while under
compression for up to 28 days.
2. Referenced Documents
4.1.1 This test method allows for additional exposure be-
2
2.1 ASTM Standards: yond the minimum 28 day exposure period as described in 4.1.
If it is desired to extend the exposure period beyond 28 days,
C717 Terminology of Building Seals and Sealants
C920 Specification for Elastomeric Joint Sealants prepare an additional six specimens for each extended expo-
sure period. Of these six specimens prepared, two specimens
C1442 Practice for Conducting Tests on Sealants Using
Artificial Weathering Apparatus each should be stored as described in the three conditions
named in 4.1.
G113 Terminology Relating to Natural andArtificial Weath-
4.2 The effects of the test are evaluated by visual inspection
for changes in surface appearance and average measurements
1
ThistestmethodisunderthejurisdictionofASTMCommitteeC24onBuilding
of any stain depth and stain width.
Seals and Sealants and is the direct responsibility of Subcommittee C24.40 on
Weathering.
4.3 This test method is applicable to any type of elastomeric
Current edition approved July 1, 2022. Published August 2022. Originally
joint sealant and any type of porous substrate.
approved in 1993. Last previous edition approved in 2018 as C1248-18. DOI:
10.1520/C1248-22.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Available from International Organization for Standardization (ISO), ISO
Standards volume information, refer to the standard’s Document Summary page on Central Secretariat, Chemin de Blandonnet 8, CP 401, 1214 Vernier, Geneva,
the ASTM website. Switzerland, https://www.iso.org.
Copyright © ASTM International, 100 Barr Harbor Dri
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: C1248 − 18 C1248 − 22
Standard Test Method for
1
Staining of Porous Substrate by Joint Sealants
This standard is issued under the fixed designation C1248; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This test method covers four types of laboratory tests to determine if a joint sealant has a probability of staining a porous
substrate (such as marble, limestone, sandstone, and granite). granite, or other similar material). The tests are on compressed
samples and include (1) storage under standard laboratory conditions, (2) storage in an oven, and (3) exposure in a fluorescent
UV/condensation device, and (4) exposure in a xenon arc device.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. after
SI units are provided for information only and are not considered standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.4 The committee with jurisdiction over this standard is not aware of any comparable standards published by other organizations.
This standard is similar, but not identical, to ISO 16938-1.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
C717 Terminology of Building Seals and Sealants
C920 Specification for Elastomeric Joint Sealants
C1442 Practice for Conducting Tests on Sealants Using Artificial Weathering Apparatus
G113 Terminology Relating to Natural and Artificial Weathering Tests of Nonmetallic Materials
G151 Practice for Exposing Nonmetallic Materials in Accelerated Test Devices that Use Laboratory Light Sources
G154 Practice for Operating Fluorescent Ultraviolet (UV) Lamp Apparatus for Exposure of Nonmetallic Materials
G155 Practice for Operating Xenon Arc Lamp Apparatus for Exposure of Materials
3
2.2 ISO Standard:
ISO 16938-1 Buildings and civil engineering works — Determination of the staining of porous substrates by sealants used in
joints — Part 1: Test with compression
1
This test method is under the jurisdiction of ASTM Committee C24 on Building Seals and Sealants and is the direct responsibility of Subcommittee C24.40 on
Weathering.
Current edition approved June 1, 2018July 1, 2022. Published June 2018August 2022. Originally approved in 1993. Last previous edition approved in 20122018 as
C1248-08(2012).C1248-18. DOI: 10.1520/C1248-18.10.1520/C1248-22.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from International Organization for Standardization (ISO), ISO Central Secretariat, Chemin de Blandonnet 8, CP 401, 1214 Vernier, Geneva, Switzerland,
https://www.iso.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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C1248 − 22
3. Terminology
3.1 Definitions:
3.1.1 Refer to Terminology C717 and G113 for definitions of terms used in this test method.
4. Summary of Test Method
4.1 In this test method standard joint specimens are compressed and clamped at the manufacturer’s rated movement capability and
subjected to the following treatments; (a) four of the specimens are stored at standard conditions while under compression for up
to 28 days; (b) four of the specimens are exposed in an oven while under compression for up to 28 days; (c) four of the specimens
are exposed either in a fluorescent UV/condensation device or in a xenon arc device while under compression for up to 28 days.
4.1.1 This test method allows for additional exposure beyond the minimum 28 day exposure period as described in 4.1. If it is
desi
...