1、3-33-87 L-S -1 2 5B February 3, 1972 SUPERSEDING Fed. Spec. L-S-125A June 1, 1967 FEDERAL SPECIFICATION S CREENING , INSECT , NONbBTALLI C This spec ficat-on was approved by the Commissioner, Federal Supply Service, General Services Administration, for the use of all Federal agencies. 1. SCOPE AND C
2、LASSIFICATION 1.1 Scope. This specification covers the requirements for two types of screening made of plastic filaments and one type of screening made of plastic coated or impregnated fibrous glass yarn. 1.2 Classification. 1.2.1 Typ es, classes, and mesh sizes. The plastic screening shall be of th
3、e following types, classes, and mesh sizes, as specified (see 6.2): Type 1 - Polyvinylidene chloride filament. Class 1 - 0.0120 inch diameter. Class 2 - 0.0150 inch diameter. Type II - Plastic coated or impregnated fibrous glass yarn. Class 1 - 0.0115 inch diameter. Class 2 - 0.0130 inch diameter. T
4、ype III - Polypropylene filament. Class 1 - O .O120 inch diameter. Class 2 - 0.0150 inch diameter. Mesh size 16 by 16 (types I, 11 and III). Mesh size 18 by 14 (types I, II and III). Mesh size 18 by 16 (type 11). Mesh size 18 by 18 (types I, II and III). Mesh size 20 by 20 (types I, II and III). Mes
5、h size 22 by 22 (types I, II and III). 2. APPLICABLE DOCUMENTS 2.1 The following documents, of the issues in effect on date of invitation for bids or request for proposal, form a part of this specification to the extent specified herein: Provided by IHSNot for ResaleNo reproduction or networking per
6、mitted without license from IHS-,-,-L-S-1256 3 7979774 0047675 1 L-S - 125B Federal Specifications: L-P-394 - Plastic Molding Material, (Propylene Plastics, Injection and Extrusion). EE-M-10 1 - Match, Safety, and Match, Nonsafety (Strike-Anywhere). ccc-JI-950 - Dyeing and Aftertreating Processes fo
7、r Cotton Cloths. PPP-B-636 - Boxes, Shipping, Fiberboard , PPP-T-45 - Tape, Gummed, Paper, Reinforced and Plain, for Sealing and Securing. Federal Standards: Fed. Std. No. 123 - Marking for Domestic Shipment (Civil Agencies). Fed. Std. No. 141 - Paint, Varnish, Lacquer, and Related Materials; Method
8、s of Inspection, Sampling, and Testing* Ped. Std. No. 191 - Textile Test Ilethods. Fed. Std. No. 595 - Colors. (Activities outside the Federal Government may obtain copies of Federal Specifications, Standards, and Handbooks as outlined under General Information in the Index of Federal Specifications
9、 and Standards and at the prices indicated in the Index. issued, is for sale on a subscription basis by the Superintendent of Documents, U.S. Government Printing Office, Washington, D.C. 20402. The Index, which includes cumulative monthly supplements as (Single copies of this specification and other
10、 Federal Specifications required by activities outside the Federal Government for bidding purposes are available without charge from Business Service Centers at the General Services Administration Regional Offices in Boston, New York, Washington, D.C., Atlanta, Chicago, Kansas City, Mo., Fort Worth,
11、 Denver, San Francisco, Los Angeles, and Seattle, Wash. (Federal Government activities may obtain copies of Federal specifications, Standards, and Handbooks and the Index of Federal Specifications and Standards from established distribution points in their agencies .) Military Standards : MIL-STD-10
12、5 - Sampling Procedures and Tables for Inspection by Attributes. MIL-STD-129 - Marking for Shipment and Storage. (Copies of Military Specifications and Standards required by suppliers in connection with specific procurement functions should be obtained from the procuring activity or as directed by t
13、he contracting officer.) 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-L-S-125B 2.2 Other publications. The following documents form a part of this specification to the extent specified herein. identified, the issue in effect on date of invitatio
14、n for bids or request for proposal shall apply: Unless a specific issue is National Motor Freight Traffic Association, Inc., Ag ent National Motor Freight Classification (Application for copies should be addressed to the American Trucking Associations, Inc., Tariff Order Section, 1616 P Street, N,W,
15、 Washington, D.C, 20036,) Uniform Classification Committee, Agent Uniform Freight Classification (Application for copies should be addressed to the Uniform Classification Committee, Room 202, Union Station, 516 W. Jackson Blvd, Chicago, Illinois 60606 .) 3. REQUIREMENTS 3,l Material. 3.1.1 Type I. T
16、he plastic material used in fabrication of the screening filaments (type I) shall be a polyvinyldene chloride, pigmented to produce the color specified in 3.5. 3.1.2 Type II. The material used to coat or impregnate type II fibrous glass screening yarns shall be a compound of polymerized or copolymer
17、ized vinyl chloride resin, plasticized with phosphate or phthalate ester plasticizers exclusively, pigmented and stabilized to meet the requirements herein. 3.1.2.1 Plasticizers (optional). At the suppliers option, plasticizers other than phosphate or phthalate may be used, provided the coating comp
18、ound is treated with inhibitor (e) (solubilized copper 8-quinolinolate) of CCC-D-950 and the color is not affected. of the coating. 8-quinolinolate content in accordance with CCC-D-950. The amount of fungicide shall be based on the nonvolatile content The coating compound shall be chemically analyze
19、d for copper 3.1.3 Type III. The plastic material used in fabrication of the screening filaments (type III) shall be polypropylene conforming to the requirements of type II of L-P-394, pigmented to produce the color specified in 3.5, 3.2 Filaments or yarns. When tested as specified in 4.2.1, the dia
20、meter of the filaments or yarns (see 3.1.1, 3.1.2 and 3.1.3) used in fabrication of the screening, shall be as specified in table I. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-L-S-L25B 83 m 7977774 0047677 1 L-S-125B Mesh size of screening 16
21、by 16 18 by 14 18 by 16 18 by 18 20 by 20 22 by 22 TABLE I Nominal filament diameter i/, inch Types 1 Class 1 - o .o120 .o120 . o 12.0 and III Class 2 O .O150 .O150 - - o ,0150 - Type C1a;ss 1 - O .O115 O ,0115 , O 115 .O 115 Class 2 O ,0130 . O 130 O ,0130 .O130 .O 130 - - i/ The permissible variat
22、ion in the average diameter of the filaments for types I and III screening shall be plus or minus 10 percent of the nominal diameter; for type II screening, the tolerance shall be plus or minus 0.0010 inch. 3.2.1 Tensile strength of filaments, (types I and III). The minimum average tensile strength
23、of the filaments for types I and II1,classes 1 and 2 screening shall be 20,000 p.s.i., when tested as specified in 4.2.1. 3.2.2 Elongation of filaments or yarns. The minimum elongation of the filaments for types I and III, classes 1 and 2 screening shall be 15 percent and for type II, classes 1 and
24、2, screening shall be 3 percent maximum, when tested as specified in 4.2.1. 3.2.3 Resistance to water immersion, (types I and III). The average change in length of the filaments shall be not greater than 2 percent, when tested as specified in 4.2.1. 3.2.4 Splices. Splices for type II screening only
25、shall be permitted at any point of an individual yarn provided they show no tails, and do not exceed 1 inch in length. one in any one square foot nor fifteen in any roll. permitted. The number of splices shall not exceed Knots shall not be 3.3 Construction. 3.3.1 Screening, (type I). The finished sc
26、reening shall be fabricated from the filaments specified in 3.1.1, and have a woven or mock selvage of at least 6 ends in each edge. fied in 4.3, shall have a variation of not more than 0.5 mesh per inch of the mesh specified. The mesh of screening, when tested as speci- 4 Provided by IHSNot for Res
27、aleNo reproduction or networking permitted without license from IHS-,-,-L-S - 125B 3.3.2 Screening, (type II). The finished screening shall be fabricated from the yarns specified in 3.1.2, and have a woven or mock selvage of at least 6 ends in each edge. yarns shall be uniformly spaced on both the w
28、arp and filling directions. When tested as specified in 4.3, the mesh shall be within plus or minus 0.5 mesh per inch of the mesh specified. Except for one half inch from each-side, the 3.3.3 Screening, (type III). The finished screening shall be fabricated from the filaments specified in 3.1.3 and
29、shall have a woven or mock selvage of at least 6 ends in each edge. - specified in 4.3, shall have a variation of not more than 0.5 mesh per inch of the mesh specified. The screening must be heat set in order to meet the requirements specified in 3.4. The mesh of screening, when tested a8 3.4 Physic
30、al properties. The physical properties of the finished screening shall be as specified in table II, when tested as specified in 4.3. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-L-S-125B 1 a u) u) an Hd HU al EiF d U H H !-I u) a alN Da cd ma cd
31、 I44 (d U rl 8 a h B ww Odd mrn1-344 4d d44 oom O0 rnrnimmb 44 4dN . , . . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-* H H L-S-125B 3 9 a y- - -y 003003 zz I Imm L-S-125B 7 Provided by IHSNot for ResaleNo reproduction or networking permitted wi
32、thout license from IHS-,-,-L-S-3256 83 9799774 0049683 3 m L-S-125B natural, aluminum, or green not darker than No. 14036 and not lighter than No. 14077 of Ped. Std. Mo. 595, as specified (see 6.2). I and not lighter than No. 14077, and aluminum shall fall between No. 36492 and No. 36173 of Ped. Std
33、. Mo. 595, 3.6 Widths. 3.6.1 Widths, (types I and III) The overall widths of the types I and III screening shall be 24, 26, 28, 30, 32, 36, 42, or 48 inches, as specified (see 6.2) , and the width specified shall be the minimum acceptable width. 3.6.2 Widths, (type 11). The overall widths of the typ
34、e II screening shall be supplied in widths from 24 to 48 inches, inclusive, in 2-inch incrments , as specified (see 6.2) , and the width specified shall be the minimum acceptable width. rolls containing not less than 100 linear feet and shall contain not more than three pieces per roll with no piece
35、 less than 10 linear feet in length. roll of screening shall weigh not more than 20 pounds. Each I blocking in excess of scale No. 1. W weathering, when tested as specified in 4.3. 3.10 Yarn slippane resistance. When tested as specified in 4.3, the tension required for complete slippage of the yarn
36、shall be not less than 5.0 pounds for type II, class 2, and not less than 2.5 pounds for type II, class 1. type II screening shall remain unaffected after being in contact with the lighted end of a cigarette for 10.0 seconds. 3.12 Flame resistance. When tested as specified in 4.3, the screening shal
37、l not burn for longer than 10 seconds after removal of a match flame, shall not exceed the applicable acceptable quality levels (AQLS) established herein for any examinations and tests of materials, components, and end items, as applicable. Provided by IHSNot for ResaleNo reproduction or networking
38、permitted without license from IHS-,-,-TABLE III. Instructions for testing Characteris tic Composition Diameter Tensile strength 2-/ Number deter- 3.1.2 - 3,2 4.4.3 3.2.1 4.4.5 3 5 Results reported as numerically to nearest 0.001 inch Pound/square inch 9 Provided by IHSNot for ResaleNo reproduction
39、or networking permitted without license from IHS-,-,-L-S-125B - Component Filament or yarn ( con t d) L-S-LZSB 83 m 7 004qm 7 m TABLE III. Instructions for testing (contd) j Specification reference Characteris tic i Requirement i Test method Ultimate 13.2.2 elongation Resistance to ! 3.2.3 water imm
40、er- i sion 21 I 4.4.5 4.4.6 - i/ 2/ A certificate of compliance may be furnished in Types I and III only. - Number deter- minations per sample unit 5 3 Lieu of testing. 4.2.2 Inspection of the end item. The end item shall be inspected for defects in accordance with classifications in 4.2.2.1, and 4.
41、2.2.2.2. 4.2.2.1 Foot-by-foot examination. The required footage of each roll shall be , examined and the visual defects classified as listed below. All defects found shall be counted regardless of their proximity one to another, except where two or more defects represent a single local condition of
42、the screening, in which case only the more serious defect shall be counted as one defect for each warpwise foot or fraction thereof in which it occurs. The sample unit for this examination shall be 1 linear foot. level II of MIL-STD-105. The AQL shall be 4.0 defects per 100 units (feet). The lot siz
43、e shall be expressed in units of one foot each. An approximate equal number of feet shall be examined from each roll selected. The number of rolls from which the sample is to be selected shall be in accordance with table IV. The sample size shall be in accordance with inspection Defects Broken or mi
44、ssing end or pick. Crease - wrinkle - hard, embedded. Any curled, doubled, rolled, or folded selvage. Any cut, hole, or tear. Damaged selvage extending into body of screening. Floats - Any multiple floats. Single float more than 1/4 inch in length in warp or filling direction. Hitch-back, open place
45、 or slippage. Jerked-in filling, slough-off , or thick place more than twice the thickness of the normal yarn. 10 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-L-S-125B 83 = 7777774 0047684 7 w L-S-125B Defects (contd) Double picks, more than one i
46、n a shed. Scalloped selvage - any indentation in excess of 1/4 inch. Any mesh opening larger than specified regardless of the cause. Selvage, slack or tight - causing pronounced waviness or Width - Less than specified. Smash - any. Mottled or cloudy.* Spot , stain, or streak clearly visible.* Off sh
47、ade.* Tight end or pick - causing waviness or ridge in screening. Not clean. Bias or bowed filling - distortion at any point 1/2 inch or Uneven weaving (heavy or light bars). Weak spots - any. Uncoated or unimpregnated yarns - any (type 11) .* Any knot. Any splice, (types I and III). More than one s
48、plice in a square foot area (type II). Any splice more than 1 inch in length (type II). Any splice not well made and showing tails (type II). Wrong draw - any. slackness in selvage. more from horizontal. *At normal inspection distance (approximately 3 feet). *Single ends or picks unevenly coated and
49、 giving the appearance of a streak or light colored but coated yarn shall not be scored as a defect when examined at normal inspection distance (approximately 3 feet). TABLE IV Lot size in feet Sample size in rolls Acceptance number up to 1200 inclusive L/ 1201 up to and including 3200 3 5 3201 up to and including 10,000 8 10,001 up to and including 3
