ASTM D3806-98(2016)
(Test Method)Standard Test Method of Small-Scale Evaluation of Fire-Retardant Paints (2-Foot Tunnel Method)
Standard Test Method of Small-Scale Evaluation of Fire-Retardant Paints (2-Foot Tunnel Method)
SIGNIFICANCE AND USE
3.1 A number of laboratory procedures are used to evaluate the effectiveness of fire-retardant and fire-resistant treatments and coatings. In general, these methods measure the three stages of fire development: (1) ignition; (2) flame spread (rate of growth of the fire); and (3) conflagration extent. While all three are of extreme importance, flame spread has been recognized as the main factor associated with testing fire-retardant coatings.
3.2 Flame spread ratings based upon Test Method E84 have acquired common acceptance by regulatory agencies, but such large-scale tests are seldom practical during the development or modification of a fire-retardant coating.
3.3 This test method provides the relative flame spread of experimental coatings using small test specimens. By calibrating the 2-foot tunnel with Test Method E84-rated fire-retardant paint, results obtained by this test method should be indicative of those obtained with a large specimen in the Test Method E84 tunnel.
SCOPE
1.1 This test method determines the protection a coating affords its substrate, and the comparative burning characteristics of coatings by evaluating the flame spread over the surface when ignited under controlled conditions in a small tunnel. This establishes a basis for comparing surface-burning characteristics of different coatings without specific consideration of all the end-use parameters that might affect surface-burning characteristics under actual fire conditions.
1.2 In addition to the experimental flame spread rate, the weight of panel consumed, time of afterflaming and afterglow, char dimensions and index, and height of intumescence may be measured in this test. However, a relationship should not be presumed among these measurements.
1.3 This standard should be used to measure and describe the properties of materials, products, or assemblies in response to heat and flame under controlled laboratory conditions, and should not be used to describe or appraise the fire hazard or fire risk of materials, products, or assemblies under actual fire conditions. However, results of this test may be used as elements of a fire risk assessment which takes into account all of the factors which are pertinent to an assessment of the fire hazard of a particular end use.
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.5 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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: D3806 − 98 (Reapproved 2016)
Standard Test Method of
Small-Scale Evaluation of Fire-Retardant Paints (2-Foot
Tunnel Method)
This standard is issued under the fixed designation D3806; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
1.1 This test method determines the protection a coating 2.1 ASTM Standards:
C220Specification for Flat Asbestos-Cement Sheets
affords its substrate, and the comparative burning characteris-
ticsofcoatingsbyevaluatingtheflamespreadoverthesurface D344Test Method for Relative Hiding Power of Paints by
the Visual Evaluation of Brushouts
when ignited under controlled conditions in a small tunnel.
This establishes a basis for comparing surface-burning charac- D1475Test Method For Density of Liquid Coatings, Inks,
and Related Products
teristics of different coatings without specific consideration of
all the end-use parameters that might affect surface-burning D2196Test Methods for Rheological Properties of Non-
Newtonian Materials by Rotational Viscometer
characteristics under actual fire conditions.
E84Test Method for Surface Burning Characteristics of
1.2 In addition to the experimental flame spread rate, the
Building Materials
weight of panel consumed, time of afterflaming and afterglow,
2.2 Federal Standard:
chardimensionsandindex,andheightofintumescencemaybe
Fed. Spec. TT-V-119Varnish, Spar, Phenolic Resin
measured in this test. However, a relationship should not be
presumed among these measurements.
3. Significance and Use
1.3 This standard should be used to measure and describe
3.1 Anumber of laboratory procedures are used to evaluate
the properties of materials, products, or assemblies in response
the effectiveness of fire-retardant and fire-resistant treatments
to heat and flame under controlled laboratory conditions, and
and coatings. In general, these methods measure the three
shouldnotbeusedtodescribeorappraisethefirehazardorfire
stages of fire development: (1) ignition; (2) flame spread (rate
risk of materials, products, or assemblies under actual fire
of growth of the fire); and (3) conflagration extent. While all
conditions. However, results of this test may be used as
three are of extreme importance, flame spread has been
elements of a fire risk assessment which takes into account all
recognized as the main factor associated with testing fire-
of the factors which are pertinent to an assessment of the fire
retardant coatings.
hazard of a particular end use.
3.2 Flame spread ratings based uponTest Method E84 have
1.4 The values stated in SI units are to be regarded as the acquired common acceptance by regulatory agencies, but such
standard. The values given in parentheses are for information
large-scale tests are seldom practical during the development
only. or modification of a fire-retardant coating.
1.5 This standard does not purport to address all of the
3.3 This test method provides the relative flame spread of
safety concerns, if any, associated with its use. It is the
experimental coatings using small test specimens. By calibrat-
responsibility of the user of this standard to establish appro-
ingthe2-foottunnelwithTestMethodE84-ratedfire-retardant
priate safety and health practices and determine the applica-
paint, results obtained by this test method should be indicative
bility of regulatory limitations prior to use.
ofthoseobtainedwithalargespecimenintheTestMethodE84
tunnel.
1 2
This test method is under the jurisdiction of ASTM Committee D01 on Paint For referenced ASTM standards, visit the ASTM website, www.astm.org, or
and Related Coatings, Materials, andApplications and is the direct responsibility of contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Subcommittee D01.21 on Chemical Analysis of Paints and Paint Materials. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved Dec. 1, 2016. Published December 2016. Originally the ASTM website.
approved in 1979. Last previous edition approved in 2011 as D3806–98(2011). Available from DLA Document Services, Building 4/D, 700 Robbins Ave.,
DOI: 10.1520/D3806-98R16. Philadelphia, PA 19111-5094, http://quicksearch.dla.mil.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D3806 − 98 (2016)
4. Apparatus 4.2 Burner, 215 mm (8.5 in.) high with 40-mm diameter,
10-mmthickgridforusewithnaturalgas.Theburnerisplaced
4.1 Flame Tunnel (seeFig.1A)—610-mm(two-foot)flame
57 mm (2 ⁄4 in.) in from the fire end of the tunnel and 25 mm
tunnelconsistingofasbestos-cementboardmountedonaniron
(1 in.) below the bottom side of the sample holder, that is, 30
framework and supplied with natural gas fuel of uniform
mm (1 ⁄8 in.) from the bottom of the specimen. See Fig. 1.
quality.
NOTE 2—Artificial gas or liquid petroleum (LP) gas may be used, but
4.1.1 The framework is constructed of 3 by 25 by 25-mm
burners designed for these types of gases must be used.
( ⁄8 by 1 by 1-in.) angle iron, the top of which provides a 610
4.3 Ignition Transformer, or other suitable ignition source,
by100-mm(24by4-in.)specimenholderinclinedat28°tothe
to generate a spark through a 2-mm ( ⁄16-in.) Nichrome wire to
horizontal. The framework is mounted on a 250 by 610 by
theburnerbarrel.Thetransformerisactivatedbyapush-button
13-mm (10 by 24 by ⁄2-in.) steel base.The specimen holder is
type spark switch.
elevated185mm(7 ⁄8in.)abovethebaseatthelower(fire)end
4.4 Gas Supply, of uniform quality controlled by a positive-
and 480 mm (18 ⁄8 in.) at the upper (flue) end.
flowpressureregulatoryvalve(0to152mm(0to6in.)water)
4.1.2 The fire end and sides of the tunnel are covered to the
and a gas flowmeter (0.6 to 5.0 SCFH).
extent shown in Fig. 1, with 6-mm ( ⁄4-in.) asbestos-cement
5 6
board or 6-mm ( ⁄4-in.) inorganic reinforced-cement board 4.5 Insulating and Fire Resistant Backing for Test Panels,
7 7
consisting of 100 by 605-mm (3 ⁄8 by 23 ⁄8-in.) pieces of
attached to the inside of the angle iron framework. The open
13-mm ( ⁄2-in.) asbestos-cement board or inorganic reinforced
flue end and the cut-out sides allow a natural draft through the
cementboardand ⁄2-in.steelplateappliedoneabovetheother
tunnel. Additional air access is provided by a 25-mm (1-in.)
with asbestos cement or the inorganic reinforced cement board
hole drilled in the cover at the fire end, centered and 115 mm
placed directly on top of the test panel.
(4 ⁄2 in.) above the base.
4.1.3 Anobservationwindowmadeofa50-mm(2-in.)wide 4.6 Thermocouple totally shielded (see Note 3), installed
strip of 3-mm ( ⁄8-in.) polished heat-resistant sheet glass is through the hole in the side of the specimen holder so that its
located just below the specimen holder, extending the full tip rests on the back, cool side, of the test panel.
length of the tunnel, 610 mm (24 in.). This glass is marked by
NOTE 3—Some commercial tunnels are supplied with more than one
anyappropriatemethodat1-in.intervalsfrom4to22in.A560
thermocouple.
1 1
by 55 by 2-mm (22 by 2 ⁄4 by ⁄16-in.) sheet metal shield is
4.7 Recording Potentiometer, 0 to 300°C range.
attached above the window, slanting downwards at an angle of
4.8 Audible Timer, set to sound at 15-s intervals to indicate
60° to shield the observation window. The angle iron panel
the time for flame-front measurements.
holder is notched along the bottom or supporting lip of the
angle at 25-mm (1-in.) intervals to assist in the measurements
4.9 Constant Temperature and Humidity Room or Cabinet,
of the flame advance. maintained at 50 6 5% relative humidity and 23 6 2°C (73.5
6 3.5°F).
NOTE 1—Arule may also be mounted outside the observation window
to help measure the flame advancement.
5. Test Panels
4.1.4 A 2.5-mm ( ⁄32-in.) hole is drilled in the side of the 5.1 Test Panels—SeeTable1foralistofvariouswoodsand
1 7
specimen holder immediately above the center of the burner to
their densities. Wood, 6 by 100 by 605-mm ( ⁄4 by 3 ⁄8 by
allow insertion of a thermocouple. 23 ⁄8-in.) close grained, as nearly edge grain as possible and
free from knots and imperfections. The panels should be solid
4.1.5 The tunnel should be placed in an area as free from
wood with surfaces planed and sanded (see Note 4). Kiln-dry
drafts as possible with facilities for removal or escape of
test panels to contain not more than 10 weight% of moisture
combustion products. (Standard laboratory hood with forced
on an oven dry basis.
draft off during test.)
NOTE 4—Douglas fir, 6.3-mm ( ⁄4-in.) 3-ply, marine–grade plywood
may be used upon agreement between manufacturer and user. Asbestos-
cement board, steel, or concrete may be used upon agreement between
The sole source of supply of a suitable cabinet and assembly known to the
manufacturer and user.
committeeatthistimeisDek-TronScientific,244East3rdSt.,Plainfield,NJ07060.
If you are aware of alternative suppliers, please provide this information toASTM 5.1.1 Prior to coating, condition test panels for 14 days in
International Headquarters. Your comments will receive careful consideration at a
the controlled atmosphere of 50 6 5% relative humidity and
meeting of the responsible technical committee, which you may attend.
The sole source of supply of an asbestos-cement board, transite, known to the
committee at this time is Manville Corp., Denver CO 80217 If you are aware of The sole source of supply of a burner, Catalog No. 3–902 for artificial gas, or
alternative suppliers, please provide this information to ASTM International CatalogNo.3–900and3–902fornaturalgasandLPgas,respectively,knowntothe
Headquarters.Your comments will receive careful consideration at a meeting of the committee at this time is Fisher Scientific Co. If you are aware of alternative
responsible technical committee, which you may attend. suppliers, please provide this information to ASTM International Headquarters.
The sole source of supply of inorganic reinforced-cement board, #100S and Your comments will receive careful consideration at a meeting of the responsible
3 3 1
100H, nominal 1600 to 1760 kg/m (100 to 110 lb/ft ), known to the committee at technical committee, which you may attend.
this time is Shameful Corp., 100 Spence Lane, Nashville, TN 37210. If you are The sole source of supply of a thermocouple, Megopak Type J, known to the
aware of alternative suppliers, please provide this information to ASTM Interna- committee at this time is Megopak Co. If you are aware of alternative suppliers,
tional Headquarters.Your comments will receive careful consideration at a meeting please provide this information to ASTM International Headquarters. Your com-
of the responsible technical committee, which you may attend. ments will receive careful consideration at a meeting of the responsible technical
7 1
Quartz or high-silica glass has been found satisfactory for this purpose. committee, which you may attend.
D3806 − 98 (2016)
FIG. 1 Flame Tunnel
D3806 − 98 (2016)
TABLE 1 Densities and Panel Weights of Various Woods (Conditioned at Relative Humidity 50 ± 5 % and 23± 2°C
(73.5 ± 3.5°F) for 14 days)
7 7 1
Density (9 to 10 % Moisture), Weight of 3 ⁄8 by 23 ⁄8 by ⁄4 in.
Type of Wood
3 3
kg/m (lb/ft ) Panel, g
Red cedar 345 to 360 (21.4 to 22.4) 130 to 140
Douglas fir 465 to 560 (29 to 35) 180 to 215
White pine-Ponderosa pine 360 to 420 (22.4 to 26.4) 140 to 160
Southern yellow pine 495 to 590 (31 to 37) 190 to 225
Redwood 435 to 450 (27.2 to 28.2) 165 to 175
23 6 2°C (73.5 6 3.5°F) toa9to10% moisture content. 60.5 D
W 5 (2)
Refer to Table 1 for the density and weight per panel of each S
R
listed wood.
where:
5.1.2 Seal the ends of the panels with two coats of varnish
W = weight of applied wet coating, g,
conforming to Fed. Spec. TT-V-119 after conditioning. Allow
D = coating density, g/mL, and
each coat of varnish to air-dry 18 to 24 h.
S = spreading rate in m /L.
R
6. Calibration Standards
7.5 Dry the coated panels under standard conditions (4.9)
until equilibrium weight is obtained, allowing sufficient time
6.1 Zero-Flame Spread—Asbestos-cement board, Type F
forthecompleteevaporationofsolvents,anycuringthatmight
conforming to Specification C220, 13 by 100 by 605 mm ( ⁄2
be required by the material, and for the attainment of equilib-
7 7
by 3 ⁄8 by 23 ⁄8 in.), conditioned as in 5.1.1.
rium moisture content. Forty-eight hours are normally suffi-
NOTE5—Inorganicreinforcedcementboard,6.3-mm( ⁄4-in.)thickmay
cient except for certain coatings that may require longer
be substituted for asbestos cement.
periods because they trap solvent or contain solvents that
6.2 Fire-Rated Standard—A test panel, similar to that used
evaporate very slowly.
with test coatings, coated with Test Method E84 rated paint at
7.6 Apply and cure non-air–drying coatings as recom-
the manufacturer’s recommended spreading rate and condi-
mended by the supplier and condition as specified in 7.5.
tioned as in Section 7.
NOTE 6—Do not use paint beyond manufacturer’s stated shelf life.
8. Calibration of the Tunnel
8.1 Calibrate the tunnel prior to each day’s operation with
7. Preparation of Test Panels
the calibration standards described in Section 6.
7.1 Thoroughly mix the coating under test by a suitable
8.1.1 Place the zero flame-spread standard in the holder,
means until it is uniform in composition and consistency. Test
smooth side down, and back it with the backing plate (4.5).
Methods D2196 describes a suitable preparation procedure.
8.1.2 Open the gas valve and adjust to a pressure of 1.3 kPa
7.2 Determine the density of the coating in accordance with
2 3
(3 oz/in. ) and a constant flow of 38 mL/s (4.8 ft /h), and
Test Method D1475 in grams per millilitre (or pounds per
actuate the interval timer.
gallon) for calculating the weight of the coating to be applied
to the panel to comply with the specified spreading rate.
NOTE 7—These conditions are specified for a natural gas supply
3 3
providing40MJ/m (1055BTU/ft ).Foranyothergassupply,adjustflow
7.3 Brush apply the coating to conditioned test panels in as
to provide 1490 J/s (5085 BTU/h).
uniform a manner as possible to obtain the specified spreading
8.1.2.1 When the timer sounds, ignite the burner using the
rate. A suitable procedure appears in Test Method D344.
ignition transformer. Observe the flame front, measure in
Application may be by other conventional means and in as
inches and record at 15-s intervals t
...
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: D3806 − 98 (Reapproved 2011) D3806 − 98 (Reapproved 2016)
Standard Test Method of
Small-Scale Evaluation of Fire-Retardant Paints (2-Foot
Tunnel Method)
This standard is issued under the fixed designation D3806; 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 determines the protection a coating affords its substrate, and the comparative burning characteristics of
coatings by evaluating the flame spread over the surface when ignited under controlled conditions in a small tunnel. This
establishes a basis for comparing surface-burning characteristics of different coatings without specific consideration of all the
end-use parameters that might affect surface-burning characteristics under actual fire conditions.
1.2 In addition to the experimental flamespread flame spread rate, the weight of panel consumed, time of afterflaming and
afterglow, char dimensions and index, and height of intumescence may be measured in this test. However, a relationship should
not be presumed among these measurements.
1.3 This standard should be used to measure and describe the properties of materials, products, or assemblies in response to heat
and flame under controlled laboratory conditions, and should not be used to describe or appraise the fire hazard or fire risk of
materials, products, or assemblies under actual fire conditions. However, results of this test may be used as elements of a fire risk
assessment which takes into account all of the factors which are pertinent to an assessment of the fire hazard of a particular end
use.
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.5 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 and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards:
C220 Specification for Flat Asbestos-Cement Sheets
D344 Test Method for Relative Hiding Power of Paints by the Visual Evaluation of Brushouts
D1475 Test Method For Density of Liquid Coatings, Inks, and Related Products
D2196 Test Methods for Rheological Properties of Non-Newtonian Materials by Rotational Viscometer
E84 Test Method for Surface Burning Characteristics of Building Materials
2.2 Federal Standard:
Fed. Spec. TT-V-119 Varnish, Spar, Phenolic Resin
3. Significance and Use
3.1 A number of laboratory procedures are used to evaluate the effectiveness of fire-retardant and fire-resistant treatments and
coatings. In general, these methods measure the three stages of fire development: (1) ignition; (2) flame spread (rate of growth of
the fire); and (3) conflagration extent. While all three are of extreme importance, flame spread has been recognized as the main
factor associated with testing fire-retardant coatings.
This test method is under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications and is the direct responsibility of
Subcommittee D01.21 on Chemical Analysis of Paints and Paint Materials.
Current edition approved June 1, 2011Dec. 1, 2016. Published June 2011December 2016. Originally approved in 1979. Last previous edition approved in 20042011 as
D3806 – 98 (2004).(2011). DOI: 10.1520/D3806-98R11.10.1520/D3806-98R16.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’sstandard’s Document Summary page on the ASTM website.
Available from Standardization Documents Order Desk, DODSSP, Bldg. 4, Section D, DLA Document Services, Building 4/D, 700 Robbins Ave., Philadelphia, PA
19111-5098, http://dodssp.daps.dla.mil.19111-5094, http://quicksearch.dla.mil.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D3806 − 98 (2016)
3.2 Flame spread ratings based upon Test Method E84 have acquired common acceptance by regulatory agencies, but such
large-scale tests are seldom practical during the development or modification of a fire-retardant coating.
3.3 This test method provides the relative flame spread of experimental coatings using small test specimens. By calibrating the
2-foot tunnel with Test Method E84-rated fire-retardant paint, results obtained by this test method should be indicative of those
obtained with a large specimen in the Test Method E84 tunnel.
4. Apparatus
4.1 Flame Tunnel (see Fig. 1A)—610-mm (two-foot) flame tunnel consisting of asbestos-cement board mounted on an iron
framework and supplied with natural gas fuel of uniform quality.
4.1.1 The framework is constructed of 3 by 25 by 25-mm ( ⁄8 by 1 by 1-in.) angle iron, the top of which provides a 610 by
100-mm (24 by 4-in.) specimen holder inclined at 28° to the horizontal. The framework is mounted on a 250 by 610 by 13-mm
1 3
(10 by 24 by ⁄2-in.) steel base. The specimen holder is elevated 185 mm (7 ⁄8 in.) above the base at the lower (fire) end and 480
mm (18 ⁄8 in.) at the upper (flue) end.
4.1.2 The fire end and sides of the tunnel are covered to the extent shown in Fig. 1, with 6-mm ( ⁄4-in.) asbestos-cement board
or 6-mm ( ⁄4-in.) inorganic reinforced-cement board attached to the inside of the angle iron framework. The open flue end and
the cut-out sides allow a natural draft through the tunnel. Additional air access is provided by a 25-mm (1-in.) hole drilled in the
cover at the fire end, centered and 115 mm (4 ⁄2 in.) above the base.
4.1.3 An observation window made of a 50-mm (2-in.) wide strip of 3-mm ( ⁄8-in.) polished heat-resistant sheet glass is located
just below the specimen holder, extending the full length of the tunnel, 610 mm (24 in.). This glass is marked by any appropriate
1 1
method at 1-in. intervals from 4 to 22 in. A 560 by 55 by 2-mm (22 by 2 ⁄4 by ⁄16-in.) sheet metal shield is attached above the
window, slanting downwards at an angle of 60° to shield the observation window. The angle iron panel holder is notched along
the bottom or supporting lip of the angle at 25-mm (1-in.) intervals to assist in the measurements of the flame advance.
NOTE 1—A rule may also be mounted outside the observation window to help measure the flame advancement.
4.1.4 A 2.5-mm ( ⁄32-in.) hole is drilled in the side of the specimen holder immediately above the center of the burner to allow
insertion of a thermocouple.
4.1.5 The tunnel should be placed in an area as free from drafts as possible with facilities for removal or escape of combustion
products. (Standard laboratory hood with forced draft off during test.)
4.2 Burner, 215 mm (8.5 in.) high with 40-mm diameter, 10-mm thick grid for use with natural gas. The burner is placed 57
1 1
mm (2 ⁄4 in.) in from the fire end of the tunnel and 25 mm (1 in.) below the bottom side of the sample holder, that is, 30 mm (1 ⁄8
in.) from the bottom of the specimen. See Fig. 1.
NOTE 2—Artificial gas or liquid petroleum (LP) gas may be used, but burners designed for these types of gases must be used.
4.3 Ignition Transformer, or other suitable ignition source, to generate a spark through a 2-mm ( ⁄16-in.) Nichrome wire to the
burner barrel. The transformer is activated by a push-button type spark switch.
4.4 Gas Supply, of uniform quality controlled by a positive-flow pressure regulatory valve (0 to 152 mm (0 to 6 in.) water) and
a gas flowmeter (0.6 to 5.0 SCFH).
7 7
4.5 Insulating and Fire Resistant Backing for Test Panels, consisting of 100 by 605-mm (3 ⁄8 by 23 ⁄8-in.) pieces of 13-mm
1 1
( ⁄2-in.) asbestos-cement board or inorganic reinforced cement board and ⁄2-in. steel plate applied one above the other with asbestos
cement or the inorganic reinforced cement board placed directly on top of the test panel.
4.6 Thermocouple totally shielded (see Note 3), installed through the hole in the side of the specimen holder so that its tip rests
on the back, cool side, of the test panel.
NOTE 3—Some commercial tunnels are supplied with more than one thermocouple.
The sole source of supply of a suitable cabinet and assembly known to the committee at this time is Dek-Tron Scientific, 244 East 3rd St., Plainfield, NJ 07060. If you
are aware of alternative suppliers, please provide this information to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of
the responsible technical committee, which you may attend.
The sole source of supply of an asbestos-cement board, transite, known to the committee at this time is Manville Corp., Denver CO 80217 If you are aware of alternative
suppliers, please provide this information to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of the responsible technical
committee, which you may attend.
3 3
The sole source of supply of inorganic reinforced-cement board, #100S and 100H, nominal 1600 to 1760 kg/m (100 to 110 lb/ft ), known to the committee at this time
is Shameful Corp., 100 Spence Lane, Nashville, TN 37210. If you are aware of alternative suppliers, please provide this information to ASTM International Headquarters.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
Quartz or high-silica glass has been found satisfactory for this purpose.
The sole source of supply of a burner, Catalog No. 3–902 for artificial gas, or Catalog No. 3–900 and 3–902 for natural gas and LP gas, respectively, known to the
committee at this time is Fisher Scientific Co. If you are aware of alternative suppliers, please provide this information to ASTM International Headquarters. Your comments
will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
The sole source of supply of a thermocouple, Megopak Type J, known to the committee at this time is Megopak Co. If you are aware of alternative suppliers, please
provide this information to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of the responsible technical committee, which
you may attend.
D3806 − 98 (2016)
FIG. 1 Flame Tunnel
D3806 − 98 (2016)
TABLE 1 Densities and Panel Weights of Various Woods (Conditioned at Relative Humidity 50 ± 5 % and 23± 2°C
(73.5 ± 3.5°F) for 14 days)
7 7 1
Density (9 to 10 % Moisture), Weight of 3 ⁄8 by 23 ⁄8 by ⁄4 in.
3 3
Type of Wood kg/m (lb/ft ) Panel, g
345 to 360 (21.4 to 22.4) 130 to 140
Red cedar
465 to 560 (29 to 35) 180 to 215
Douglas fir
360 to 420 (22.4 to 26.4) 140 to 160
White pine-Ponderosa pine
495 to 590 (31 to 37) 190 to 225
Southern yellow pine
435 to 450 (27.2 to 28.2) 165 to 175
Redwood
4.7 Recording Potentiometer, 0 to 300°C range.
4.8 Audible Timer, set to sound at 15-s intervals to indicate the time for flame-front measurements.
4.9 Constant Temperature and Humidity Room or Cabinet, maintained at 50 6 5 % relative humidity and 23 6 2°C (73.5 6
3.5°F).
5. Test Panels
1 7 7
5.1 Test Panels—See Table 1 for a list of various woods and their densities. Wood, 6 by 100 by 605-mm ( ⁄4 by 3 ⁄8 by 23 ⁄8-in.)
close grained, as nearly edge grain as possible and free from knots and imperfections. The panels should be solid wood with
surfaces planed and sanded (see Note 4). Kiln-dry test panels to contain not more than 10 weight % of moisture on an oven dry
basis.
NOTE 4—Douglas fir, 6.3-mm ( ⁄4-in.) 3-ply, marine–grade plywood may be used upon agreement between manufacturer and user. Asbestos-cement
board, steel, or concrete may be used upon agreement between manufacturer and user.
5.1.1 Prior to coating, condition test panels for 14 days in the controlled atmosphere of 50 6 5 % relative humidity and 23 6
2°C (73.5 6 3.5°F) to a 9 to 10 % moisture content. Refer to Table 1 for the density and weight per panel of each listed wood.
5.1.2 Seal the ends of the panels with two coats of varnish conforming to Fed. Spec. TT-V-119 after conditioning. Allow each
coat of varnish to air-dry 18 to 24 h.
6. Calibration Standards
1 7
6.1 Zero-Flame Spread—Asbestos-cement board, Type F conforming to Specification C220, 13 by 100 by 605 mm ( ⁄2 by 3 ⁄8
by 23 ⁄8 in.), conditioned as in 5.1.1.
NOTE 5—Inorganic reinforced cement board, 6.3-mm ( ⁄4-in.) thick may be substituted for asbestos cement.
6.2 Fire-Rated Standard—A test panel, similar to that used with test coatings, coated with Test Method E84 rated paint at the
manufacturer’s recommended spreading rate and conditioned as in Section 7.
NOTE 6—Do not use paint beyond manufacturer’smanufacturer’s stated shelf life.
7. Preparation of Test Panels
7.1 Thoroughly mix the coating under test by a suitable means until it is uniform in composition and consistency. Test Methods
D2196 describes a suitable preparation procedure.
7.2 Determine the density of the coating in accordance with Test Method D1475 in grams per millilitre (or pounds per gallon)
for calculating the weight of the coating to be applied to the panel to comply with the specified spreading rate.
7.3 Brush apply the coating to conditioned test panels in as uniform a manner as possible to obtain the specified spreading rate.
A suitable procedure appears in Test Method D344. Application may be by other conventional means and in as many coats as
required to obtain the necessary weight of coating, or desired wet– or dry–film thickness.
7.4 Calculate the weight of coating to be applied using the following equation:
7 7
3 323 D
S D
8 8
W 5 3454 (1)
144 S
R
where:
W = weight of applied wet coating, g,
D = coating density, lb/gal, and
D3806 − 98 (2016)
S = spreading rate, ft /gal.
R
where:
W = weight of applied wet coating, g,
D = coating density, lb/gal, and
S = spreading rate, ft /gal.
R
7.4.1 Use the following equation when metric units are employed:
60.5 D
W 5 (2)
S
R
where:
W = weight of applied wet coating, g,
D = coating density, g/mL, and
S = spreading r
...
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