Trang 1 [AMERICAN NATIONAL] WBSTANDARDMV ANSI/ASTM D 250 - IT Standard Specification for ASPHALT-SATURATED ASBESTOS FELT USED IN ROOFING AND WATERPROOFING1 This Standard is issued under
Trang 1[AMERICAN NATIONAL]
WBSTANDARDMV ANSI/ASTM D 250 - IT
Standard Specification for
ASPHALT-SATURATED ASBESTOS FELT USED IN
This Standard is issued under the fixed designation D 250; the number immediately following the designation inriicates 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
' NOTE 1—The title was editorially changed in February 1978
NOTE 2—Table 1 was corrected editorially in January 1979
1 Scope
1.1 This specification covers asphalt-satu-
rated asbestos felts, with or without perfora-
tions, for use with asphalts conforming to the
requirements of Specification D 312 in the
construction of built-up roofs, and with as-
phalts conforming to the requirements of
Specification D 449 in the membrane system
of waterproofing
NOTE —The values stated in SI units are to be
regarded as the standard
2 Applicable Documents
2.1 ASTM Standards:
D146 Sampling and Testing Bitumen-Satu-
rated Felts and Fabrics Used in Roofing
and Waterproofing2
D312 Specification for Asphalt Used in
Roofing2
D449 Specification for Asphalt Used in
Dampproofing and Waterproofing'2
D 1079 Definitions of Terms Relating to
Roofing, Waterproofing, and Bituminous
Materials'2
2.2 Federal Standard:
Fed Std No 123 Marking for Domestic
Shipment (Civilian Agencies)3
2.3 Military Standards:*
MIL-R-3423 Packaging of Roofing Felt in
Rolls
MIL-STD-129 Marking for Shipment and
Storage
2.4 American Trucking Association, Inc.:
National Motor Freight Classification5
2.5 Uniform Classification Committee:
Uniform Freight Classification6
3 Classification 3.1 Asphalt-saturated asbestos felts cov- ered by this specification are of two types: 3.1.1 Type /-Nominal 730 g/m'2 (15 lb/ square), plain or perforated
3.1.2 Type //-Nominal 1460 g/m2 (30 lb/ square), plain only
4 Definitions
4.1 For definitions of terms such as "felt,"
"built-up roofing," and "square," see Defini- tions D 1079
4.2 For the purpose of sampling, a lot shall consist of the same type and size of roofing felt offered for delivery at one time
5 Ordering Information 5.1 Orders for material purchased under this specification shall include the following: 5.1.1 Designation of this specification, 5.1.2 Type of material (3.1), and whether plain or perforated,
1 This specification is under the jurisdiction of ASTM Committee D-8 on Roofing, Waterproofing, and Bituminous Materials
Current edition approved July 1, 1977 Published Sep- tember 1977 Originally published as D 250 - 26 T Last previous edition D 250 - 70
2 Annual Book of ASTM Standards, Part 15
3 Available from General Services Administration, Washington, D.C 20402
4 Available from Naval Publications and Forms Center,
5801 Tabor Ave., Philadelphia, Pa 19120
5 Available from American Trucking Association, Inc.,
1616 P St N.W., Washington, D.C 20036
6 Available from Uniform Classification Committee,
212 Union Station, Chicago, 111 60606
Trang 25.1.3 Quantity of rolls,
5.1.4 Special sampling, inspection, and
certification procedures, if required, and
5.1.5 Special packaging, packing, and
marking procedures (13.3 and 13.5), if re-
quired
6 Materials and Manufacture
6.1 The felt shall be produced from at least
85 % by mass of asbestos fiber The surface of
the felt shall be uniform and relatively
smooth Upon splitting or tearing on the bias,
the felt shall appear reasonably free of lumps
6.2 In the process of manufacture, a single
thickness of asbestos felt shall be saturated
with an asphaltic saturant
7 Physical Requirements
7.1 Asphalt-saturated asbestos felt shall
neither crack nor be so sticky as to cause
tearing or other damage upon being unrolled
at ambient temperatures above 10°C (50°F)
7.2 The material shall conform to the phys-
ical requirements prescribed in Table 1 and
the dimensions and masses prescribed in Ta-
ble 2
7.3 Plain and perforated felts shall con-
form to the same requirements as the imper-
forate (plain) type except that the perfora-
tions shall be uniformly spaced
8 Workmanship, Finish, and Appearance
8.1 The felt shall be thoroughly and uni-
formly saturated, and shall show no unsatu-
rated spots at any point upon cutting 50-mm
(2-in.) wide strips at random across the entire
sheet and splitting them open for their full
length
8.2 The surface of the felt shall not be
coated or covered with talc or other substance
that would tend to interfere with adhesion
between the felt and plying cement
8.3 The finished material shall be free of
visible external defects, such as holes, ragged
or untrue edges, breaks, cracks, tears, protu-
berances and indentations, except for inten-
tionally provided perforations and the associ-
ated protuberances
9 Sampling and Test Methods
9.1 Sample the material and determine the
properties enumerated in this specification in
accordance with Methods D 146
9.2 Determine the openness of the perfo- rations in saturated felts by the following method:
9.2.1 Cut three adjacent 305-mm (12-in.)
± 0.5 % square specimens across the width of the felt Determine the number of perfora- tions per specimen by multiplying the number
of perforations per row by the number of rows Correct for differences when rows are off-set from each other Calculate the average number of perforations per unit area 9.2.2 Place the specimen on a sheet of white paper with the smoother side up (side from which the needling or perforating device enters the felt) Use a 50-mm (2-in.) wide natural or nylon bristle paint brush to apply uniformly 15 to 20 cm3 of SAE No 10 or 10W grade motor oil to each specimen Apply the oil with smooth strokes and without undue pressure on the brush Complete the initial application in one minute and continue to brush out the oil on the surface for an addi- tional minute
9.2.3 Lift the perforated felt from the pa- per upon completion of brushing and count the oil spots showing on the white paper be- neath as open perforations Calculate the dec- imal fraction of holes open on the basis of the total number of holes determined in 9.2.1 Average the results of three determinations and report
9.2.4 Measure the size of the perforations using an optical comparitor If round, record diameter of the holes If square or rectangu- lar, record appropriate dimensions Calculate the average area of the perforations 9.2.5 Determine the average venting area
by the formula:
V = P x A x H where:
V = vented area, mm2/m2 (in.2/ft2),
P — average number of holes/m2 (average number of holes/ft2),
A = average area at one hole, mm2 (in.2), and
H = decimal fraction of open holes (dimen- sionless)
10 Inspection 10.1 Unless otherwise specified in the pur- chase contract, the supplier is responsible for inspection and may use his own or any other
Trang 3suitable facilities to establish conformance of
the material to the requirements of this speci-
fication The purchaser retains the right to
inspect the material to assure himself of com-
pliance with all requirements
11 Rejection and Rehearing
11.1 Failure to conform to any of the re-
quirements prescribed in this specification
shall constitute grounds for rejection In case
of rejection, the supplier shall have the right
to reinspect the rejected material and resub-
mit the lot after removal of those packages not
conforming to the requirements
12 Certification
12.1 Upon request of the purchaser in the
contract or order, a manufacturer's certifica-
tion that the material was manufactured and
tested in accordance with this specification,
together with a report of the test results, shall
be furnished at the time of shipment
12.2 Upon the request of the purchaser in
the contract or order, the certification of an
independent third party indicating conform-
ance to the requirements of this specification
may be accepted instead of the manufacturer's
certification
12.3 Unless otherwise specified in the pur-
chase contract, the manufacturer may certify
that the material meets all requirements of
this specification based upon previous testing
and the knowledge that maintenance of his process and quality control standards ensures compliance
13 Packaging, Marking, Shipping, and Pres- ervation
13.1 Asphalt-saturated asbestos felt shall
be furnished in 914-mm (36-in.) wide rolls The rolls need not be wound on cores Unless otherwise specified in the contract or purchase order, rolls of saturated felt shall be wrapped
in a material of sufficient width to securely bind the roll to prevent its shifting position
No roll shall contain more than two pieces of felt, and no more than 3 % of the rolls in any shipment shall contain two pieces
13.2 Containers and packing shall comply with National Motor Freight Classification rules or Uniform Freight Classification rules 13.3 When specified in the contract or pur- chase order, rolls of felt shall be prepared for shipment in accordance with the provisions of MIL-R-3423, Level A or C
13.4 Unless otherwise specified in the pur- chase order or contract, each package shall be plainly marked with the manufacturer's name, brand name, felt type and area, and shall bear the notation "asphalt."
13.5 When specified in the contract or pur- chase order, individual rolls and pallets shall
be marked in accordance with Fed Std No
123 for civilian agencies and MIL-STD-129 for military agencies
TABLE 1 Physical Requirements of Asphalt-Saturated
Asbestos Felt
Type I Type II Average breaking strength,
min, kN/m (lbf/in.) of width:
With fiber grain 3.5(20)f 7.0(40)f Across fiber grain 1.75(10)f 3.5(20)f Pliability, number of failures,
max:
13-mm (72-in.) radius bend 2 19-mm ( 3 /4-in.) radius bend 2 Loss on heating, max, % 5 5
Trang 4TABLE 2 Dimensions and Masses of Asphalt-Saturated Asbestos Felt
Width of roll, mm (in.)
Area of roll
Net mass of saturated felt, min, g/m 2 (lb/100 ft 2 )
Mass of desaturated felt, min, g/m 2 , (lb/100 ft 2 )
Mass of saturant (asphalt), min, g/m 2 (lb/100 ft 2 )' 1
Perforated felt, average area of individual hole, max, mm 2 (in 2 )
Spacing of holes in each row, center to center, mm (in.):
min
max
Spacing between adjacent rows, center to center, mm (in.):
min
max
Number of holes/m 2 (ft 2 ), min
Actual venting area, min, mm 2 /m 2 (in 2 /ft 2 ) (perforated felt only)
Thickness of desaturated felt, min, mm(in.)
Ash, min, %
Type I Type II 914(36)±0.7 %
As agreed between purchaser and supplier
635(13) 1367(28) 415(8.5) 855(17.5) 166(3.4) 342(7.0) 9.7 (0.015)
25(1) 230(9) 130/2) 38(1 l h) 130(12) 695(0.1) 0.51(0.020) 1.02(0.040)
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in connection with any item mentioned in this standard Users of this standard are expressly advised that determination
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