ASTM C1248-18

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, and granite). 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.  
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.  
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: Historical
• Publication Date: 31-May-2018
• ICS: 91.100.50 - Binders. Sealing materials
• Technical Committee: C24 - Building Seals and Sealants
• Drafting Committee: C24.40 - Weathering

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: C1248 − 18
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 G151 Practice for Exposing Nonmetallic Materials inAccel-
erated Test Devices that Use Laboratory Light Sources
1.1 This test method covers four types of laboratory tests to
G154 Practice for Operating Fluorescent Ultraviolet (UV)
determine if a joint sealant has a probability of staining a
Lamp Apparatus for Exposure of Nonmetallic Materials
porous substrate (such as marble, limestone, sandstone, and
G155 Practice for Operating XenonArc LightApparatus for
granite). The tests are on compressed samples and include (1)
Exposure of Non-Metallic Materials
storage under standard laboratory conditions, (2) storage in an
oven, and (3) exposure in a fluorescent UV/condensation
3. Terminology
device, and (4) exposure in a xenon arc device.
3.1 Definitions:
1.2 The values stated in SI units are to be regarded as the
3.1.1 Refer to Terminology C717 and G113 for definitions
standard. The values given in parentheses are for information
of terms used in this test method.
only.
1.3 This standard does not purport to address all of the
4. Summary of Test Method
safety concerns, if any, associated with its use. It is the
4.1 In this test method standard joint specimens are com-
responsibility of the user of this standard to establish appro-
pressed and clamped at the manufacturer’s rated movement
priate safety, health, and environmental practices and deter-
capabilityandsubjectedtothefollowingtreatments;(a)fourof
mine the applicability of regulatory limitations prior to use.
the specimens are stored at standard conditions while under
1.4 Thecommitteewithjurisdictionoverthisstandardisnot
compression for up to 28 days; (b) four of the specimens are
aware of any comparable standards published by other orga-
exposed in an oven while under compression for up to 28 days;
nizations.
(c) four of the specimens are exposed either in a fluorescent
1.5 This international standard was developed in accor-
UV/condensation device or in a xenon arc device while under
dance with internationally recognized principles on standard-
compression for up to 28 days.
ization established in the Decision on Principles for the
4.1.1 This test method allows for additional exposure be-
Development of International Standards, Guides and Recom-
yond the minimum 28 day exposure period as described in 4.1.
mendations issued by the World Trade Organization Technical
If it is desired to extend the exposure period beyond 28 days,
Barriers to Trade (TBT) Committee.
prepare an additional six specimens for each extended expo-
sure period. Of these six specimens prepared, two specimens
2. Referenced Documents
each should be stored as described in the three conditions
2
2.1 ASTM Standards: named in 4.1.
C717 Terminology of Building Seals and Sealants
4.2 The effects of the test are evaluated by visual inspection
C1442 Practice for Conducting Tests on Sealants Using
for changes in surface appearance and average measurements
Artificial Weathering Apparatus
of any stain depth and stain width.
G113 Terminology Relating to Natural andArtificial Weath-
4.3 This test method is applicable to any type of elastomeric
ering Tests of Nonmetallic Materials
joint sealant and any type of porous substrate.
5. Significance and Use
1
ThistestmethodisunderthejurisdictionofASTMCommitteeC24onBuilding
Seals and Sealants and is the direct responsibility of Subcommittee C24.40 on
5.1 Staining of building materials is an aesthetically unde-
Weathering.
sirable occurrence.This test method evaluates the likelihood of
Current edition approved June 1, 2018. Published June 2018. Originally
a sealant causing an early stain on a porous substrate due to
approved in 1993. Last previous edition approved in 2012 as C1248-08(2012). DOI:
10.1520/C1248-18.
exudation of materials from the sealant. Since this is an
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
accelerated test, it does not necessarily predict that the tested
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
sealants will not stain or discolor porous substrates over longer
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. periods of time.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
C1248 − 18
6. Appara
...

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 − 08 (Reapproved 2012) C1248 − 18
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). 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.
1.3 This standard does not purport to address all of the safety problems,concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appropriate safety safety, health, and healthenvironmental 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.
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
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 Light Apparatus for Exposure of Non-Metallic Materials
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
desired to extend the exposure period beyond 28 days, prepare an additional six specimens for each extended exposure period. Of
these six specimens prepared, two specimens each should be stored as described in the three conditions named in 4.1.
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 Dec. 1, 2012June 1, 2018. Published December 2012June 2018. Originally approved in 1993. Last previous edition approved in 20082012 as
C1248C1248-08(2012).-08. DOI: 10.1520/C1248-08R12.10.1520/C1248-18.
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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
C1248 − 18
4.2 The effects of the test are evaluated by visual inspection for changes in surface appearance and average measurements of
any stain depth and stain width.
4.3 This test method is applicable to any type of elastomeric joint sealant and any type of porous substrate.
5. Significance and Use
5.1
...