ASTM C1248-08
(Test Method)Standard Test Method for Staining of Porous Substrate by Joint Sealants
Standard Test Method for Staining of Porous Substrate by Joint Sealants
SIGNIFICANCE AND USE
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 problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health 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.
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Designation: C1248 − 08
StandardTest 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 3. Terminology
1.1 This test method covers four types of laboratory tests to 3.1 Definitions:
determine if a joint sealant has a probability of staining a 3.1.1 Refer to Terminology C717 and G113 for definitions
porous substrate (such as marble, limestone, sandstone, and of terms used in this test method.
granite). The tests are on compressed samples and include (1)
4. Summary of Test Method
storage under standard laboratory conditions, (2) storage in an
oven, and (3) exposure in a fluorescent UV/condensation 4.1 In this test method standard joint specimens are com-
device, and (4) exposure in a xenon arc device. pressed and clamped at the manufacturer’s rated movement
capabilityandsubjectedtothefollowingtreatments;(a)fourof
1.2 The values stated in SI units are to be regarded as the
the specimens are stored at standard conditions while under
standard. The values given in parentheses are for information
compression for up to 28 days; (b) four of the specimens are
only.
exposed in an oven while under compression for up to 28 days;
1.3 This standard does not purport to address all of the
(c) four of the specimens are exposed either in a fluorescent
safety problems, if any, associated with its use. It is the
UV/condensation device or in a xenon arc device while under
responsibility of the user of this standard to establish appro-
compression for up to 28 days.
priate safety and health practices and determine the applica-
4.1.1 This test method allows for additional exposure be-
bility of regulatory limitations prior to use.
yond the minimum 28 day exposure period as described in 4.1.
1.4 Thecommitteewithjurisdictionoverthisstandardisnot
If it is desired to extend the exposure period beyond 28 days,
aware of any comparable standards published by other orga-
prepare an additional six specimens for each extended expo-
nizations.
sure period. Of these six specimens prepared, two specimens
each should be stored as described in the three conditions
2. Referenced Documents
named in 4.1.
2
2.1 ASTM Standards:
4.2 The effects of the test are evaluated by visual inspection
C717 Terminology of Building Seals and Sealants
for changes in surface appearance and average measurements
C1442 Practice for Conducting Tests on Sealants Using
of any stain depth and stain width.
Artificial Weathering Apparatus
4.3 This test method is applicable to any type of elastomeric
G113 Terminology Relating to Natural andArtificial Weath-
joint sealant and any type of porous substrate.
ering Tests of Nonmetallic Materials
G151 Practice for Exposing Nonmetallic Materials inAccel-
5. Significance and Use
erated Test Devices that Use Laboratory Light Sources
5.1 Staining of building materials is an aesthetically unde-
G154 PracticeforOperatingFluorescentLightApparatusfor
sirable occurrence.This test method evaluates the likelihood of
UV Exposure of Nonmetallic Materials
a sealant causing an early stain on a porous substrate due to
G155 Practice for Operating XenonArc LightApparatus for
exudation of materials from the sealant. Since this is an
Exposure of Non-Metallic Materials
accelerated test, it does not necessarily predict that the tested
sealants will not stain or discolor porous substrates over longer
periods of time.
1
ThistestmethodisunderthejurisdictionofASTMCommitteeC24onBuilding
Seals and Sealants and is the direct responsibility of Subcommittee C24.40 on
6. Apparatus
Weathering.
Current edition approved April 1, 2008. Published April 2008. Originally
6.1 Forced-Draft Oven.
approved in 1993. Last previous edition approved in 2006 as C1248-06. DOI:
10.1520/C1248-08.
6.2 Exposure Apparatus:
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.2.1 Fluorescent UV/condensation apparatus that conforms
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
totherequirementsinPracticesG151andG154withUVA-340
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. type lamps.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
C1248 − 08
6.2.2 Xenon-Arc apparatus that conforms to the require-
ments in Practices G151 and G155 with daylight type filters.
6.3 TFE-Fluorocarbon Spacers.
6.4 Masking Tape.
7. Test Specimens
7.1 Substrates
...
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:C1248–06 Designation:C1248–08
Standard Test Method for
1
Staining of Porous Substrate by Joint Sealants
This standard is issued under the fixed designation C 1248; 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 (e) 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, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health 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.
2. Referenced Documents
2
2.1 ASTM Standards:
C 717 Terminology of Building Seals and Sealants
C 1442 Practice for Conducting Tests on Sealants Using Artificial Weathering Apparatus
G 113 Terminology Relating to Natural and Artificial Weathering Tests of Nonmetallic Materials
G 151 Practice for Exposing Nonmetallic Materials in Accelerated Test Devices that Use Laboratory Light Sources
G 154 Practice for Operating Fluorescent Light Apparatus for UV Exposure of Nonmetallic Materials
G 155 Practice for Operating Xenon Arc Light Apparatus for Exposure of Non-Metallic Materials
3. Terminology
3.1 Definitions:
3.1.1 Refer to Terminology C 717 and G 113 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.
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 Staining of building materials is an aesthetically undesirable occurrence. This test method evaluates the likelihood of a
1
This test method is under the jurisdiction of ASTM Committee C24 on Building Seals and Sealants and is the direct responsibility of Subcommittee C24.40on
Weathering.
Current edition approved Jan.April 1, 2006.2008. Published February 2006.April 2008. Originally approved in 1993. Last previous edition approved in 20042006 as C
1248-04.1248-06.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. 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 ----------------------
C1248–08
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.
6. Apparatus
6.1 Forced-Draft Oven.
6.2
...
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