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ASTM C1248-06

(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.
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.
1.3 The committee with jurisdiction over this standard is not aware of any comparable standards published by other organizations.

General Information

Status
Historical
Publication Date
31-Dec-2005
ICS
91.100.50 - Binders. Sealing materials
Technical Committee
C24 - Building Seals and Sealants
Drafting Committee
C24.40 - Weathering
Current Stage
Ref Project

Relations

Replaces
ASTM C1248-04 - Standard Test Method for Staining of Porous Substrate by Joint Sealants
Effective Date
01-Jan-2006
Replaced By
ASTM C1248-08 - Standard Test Method for Staining of Porous Substrate by Joint Sealants
Effective Date
01-Apr-2008
Referred By
ASTM C1021-08(2023) - Standard Practice for Laboratories Engaged in Testing of Building Sealants
Effective Date
01-Jan-2006
Referred By
ASTM C1193-16(2023) - Standard Guide for Use of Joint Sealants
Effective Date
01-Jan-2006
Referred By
ASTM C1401-23 - Standard Guide for Structural Sealant Glazing
Effective Date
01-Jan-2006

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ASTM C1248-06 - Standard Test Method for Staining of Porous Substrate by Joint SealantsASTM C1248-06 - Standard Test Method for Staining of Porous Substrate by Joint Sealants
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ASTM C1248-06 - Standard Test Method for Staining of Porous Substrate by Joint Sealants
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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:C1248–06
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 G 155 Practice for Operating Xenon Arc Light Apparatus
for Exposure of Non-Metallic Materials
1.1 This test method covers four types of laboratory tests to
determine if a joint sealant has a probability of staining a
3. Terminology
porous substrate (such as marble, limestone, sandstone, and
3.1 Definitions:
granite). The tests are on compressed samples and include (1)
3.1.1 Refer to Terminology C 717 andG113 for definitions
storage under standard laboratory conditions, (2) storage in an
of terms used in this test method.
oven, and (3) exposure in a fluorescent UV/condensation
device, and (4) exposure in a xenon arc device.
4. Summary of Test Method
1.2 The values stated in SI units are to be regarded as the
4.1 In this test method standard joint specimens are com-
standard. The values given in parentheses are for information
pressed and clamped at the manufacturer’s rated movement
only.
capabilityandsubjectedtothefollowingtreatments;(a)fourof
1.3 This standard does not purport to address all of the
the specimens are stored at standard conditions while under
safety problems, if any, associated with its use. It is the
compression for up to 28 days; (b) four of the specimens are
responsibility of the user of this standard to establish appro-
exposed in an oven while under compression for up to 28 days;
priate safety and health practices and determine the applica-
(c) four of the specimens are exposed either in a fluorescent
bility of regulatory limitations prior to use.
UV/condensation device or in a xenon arc device while under
1.4 Thecommitteewithjurisdictionoverthisstandardisnot
compression for up to 28 days.
aware of any comparable standards published by other orga-
4.2 The effects of the test are evaluated by visual inspection
nizations.
for changes in surface appearance and average measurements
2. Referenced Documents of any stain depth and stain width.
2 4.3 This test method is applicable to any type of elastomeric
2.1 ASTM Standards:
joint sealant and any type of porous substrate.
C 717 Terminology of Building Seals and Sealants
C 1442 Practice for Conducting Tests on Sealants Using
5. Significance and Use
Artificial Weathering Apparatus
5.1 Staining of building materials is an aesthetically unde-
G113 Terminology Relating to Natural and Artificial
sirable occurrence.This test method evaluates the likelihood of
Weathering Tests of Nonmetallic Materials
a sealant causing an early stain on a porous substrate due to
G 151 Practice for Exposing Nonmetallic Materials in Ac-
exudation of materials from the sealant. Since this is an
celerated Test Devices that Use Laboratory Light Sources
accelerated test, it does not necessarily predict that the tested
G 154 Practice for Operating Fluorescent Light Apparatus
sealants will not stain or discolor porous substrates over longer
for UV Exposure of Nonmetallic Materials
periods of time.
6. Apparatus
1
ThistestmethodisunderthejurisdictionofASTMCommitteeC24onBuilding
6.1 Forced-Draft Oven.
Seals and Sealants and is the direct responsibility of Subcommittee C24.40 on
6.2 Exposure Apparatus:
Weathering.
6.2.1 Fluorescent UV/condensation apparatus that conforms
Current edition approved Jan. 1, 2006. Published February 2006. Originally
approved in 1993. Last previous edition approved in 2004 as C 1248-04.
to the requirements in Practices G 151 and G 154 with UVA-
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
340 type lamps.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
6.2.2 Xenon-Arc apparatus that conforms to the require-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. ments in Practices G 151 and G 155 with daylight type filters.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
C1248–06
6.3 TFE-Fluorocarbon Spacers. other suitable tape to retain the sealant. Use masking tape on
6.4 Masking Tape. the top surface of substrates to prevent sealant from curing on
the finished surface. Remove the tape immediately following
7. Test Specimens
filling of the specimen joint cavity.
7.3.3 Single-Component Sealants—Prepare the specimens
7.1 Substrates shall be 25 by 25 by 75 mm (1 by 1 by 3 in.).
as described in 7.3.2 except that no mixing is
...

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5.1 Weight loss through volatilization of components of a sealant in a building joint may affect sealant appearance because of shrinkage, and sealant performance because of the loss of functional sealant components. Exposure to high-temperature environments will accelerate the loss of volatiles.  
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5.1 It is known that solar radiation contributes to the degradation of sealants in exterior building joints. The use of a laboratory accelerated weathering machine with actinic radiation, moisture and heat appears to be a feasible means to give indications of early degradation by the appearance of sealant cracking. However, simulated weather factors in combination with extension may produce more severe degradation than weather factors only. Therefore, the effect of the weathering test is made more sensitive by the addition of the bending of the specimen at cold temperature.
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5.1 Preformed tape sealants are tacky, deformable solids that are used under compression between two substrates in a variety of sealing applications. This procedure is not intended to simulate an actual use condition, but it will give some indication of the flexibility and adhesion of a tape at low temperature. It can serve to differentiate between flexible tapes that can take some movement and those that tend to harden or embrittle on aging and crack or lose adhesion when flexed at low temperature. It will also aid in identifying sealants that have poor flexibility because they are overextended and contain a low level of binder as well as those sealants having binders that will embrittle at low temperature.
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