ASTM C1248-04
(Test Method)Standard Test Method for Staining of Porous Substrate by Joint Sealants
Standard Test Method for Staining of Porous Substrate by Joint Sealants
SCOPE
1.1 This test method covers an accelerated laboratory procedure to determine if a joint sealant has a probability of staining a porous substrate (such as marble, limestone, sandstone, and granite).
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.
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Designation:C1248–04
Standard Test Method for
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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 rated movement capability; (b) one-third of the specimens are
storedatstandardconditionswhileundercompressionforupto
1.1 This test method covers an accelerated laboratory pro-
28 days; (c) one-third of the specimens are exposed in an oven
cedure to determine if a joint sealant has a probability of
while under compression for up to 28 days; and (d) one-third
staining a porous substrate (such as marble, limestone, sand-
of the specimens are exposed in an ultraviolet (UV) fluorescent
stone, and granite).
test chamber while under compression for up to 28 days.
1.2 The values stated in SI units are to be regarded as the
4.2 The effects of the test are evaluated by visual inspection
standard. The values given in parentheses are for information
for changes in surface appearance and average measurements
only.
of any stain depth and stain width.
1.3 This standard does not purport to address all of the
4.3 This test method is applicable to any type of elastomeric
safety problems, if any, associated with its use. It is the
joint sealant and any type of porous substrate.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
5. Significance and Use
bility of regulatory limitations prior to use.
5.1 Staining of building materials is an aesthetically unde-
2. Referenced Documents sirable occurrence.This test method evaluates the likelihood of
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a sealant causing an early stain on a porous substrate due to
2.1 ASTM Standards:
exudation of materials from the sealant. Since this is an
C 717 Terminology of Building Seals and Sealants
accelerated test, it does not necessarily predict that the tested
G 151 Practice for Exposing Nonmetallic Materials in Ac-
sealants will not stain or discolor porous substrates over longer
celerated Test Devices that Use Laboratory Light Sources
periods of time.
G 154 Practice for Operating Fluorescent Light Apparatus
for UV Exposure of Nonmetallic Materials
6. Apparatus
3. Terminology 6.1 Forced-Draft Oven.
6.2 Ultraviolet Chamber, conforming to Practice G 151 and
3.1 Definitions:
G 154 and UVA 340 type bulbs.
3.1.1 Refer to Terminology C 717 for definitions of the
6.3 “C” Clamps, or other device for maintaining the speci-
following terms used in this test method: bead; compound;
men under compression.
cure; elastomer; joint; primer; sealant; self leveling sealant;
6.4 TFE-Fluorocarbon Spacers.
and substrate.
6.5 Masking Tape.
4. Summary of Test Method
7. Test Specimens
4.1 This test method consists of subjecting standard joint
7.1 Substrates shall be 25 by 25 by 75 mm (1 by 1 by 3 in.).
specimens to various exposure treatments as follows: ( a) all
A total of 24 substrates are required to make the twelve test
specimens are compressed and clamped at the manufacturer’s
specimens.
NOTE 1—The precision and bias statement is based on Vermont white
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ThistestmethodisunderthejurisdictionofASTMCommitteeC24onBuilding
marble and Bethel white granite substrates.
Seals and Sealants and is the direct responsibility of Subcommittee C24.40 on
Weathering.
7.2 Primers—When a primer is recommended by the seal-
CurrenteditionapprovedMay1,2004.PublishedJuly2004.Originallyapproved
ant manufacturer, apply the primer to one substrate block of
in 1993. Last previous edition approved in 1998 as C 1248-93(1998).
2 each test specimen.Apply the primer where the sealant will be
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
in contact with the substrate.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
7.3 Preparation of Test Specimens:
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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C1248–04
7.3.1 Standard conditions of temperature and relative hu-
midity used throughout this test method are defined as 23 6
2°C (73.4 6 3.6°F) and 50 6 5 %, respectively.
7.3.2 Multi-Component Sealants—Prepare twelve test
specimens for each substrate that is to be used in the test.After
maintaining the unopened sample for at least 24 h at standard
conditions, mix thoroughly for 5 min at least 250 g of base
compound with the appropriate amount of curing agent.Apply
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a bead of sealant 1
...
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