DEPARTMENT OF LABOR AND ECONOMIC OPPORTUNITY  
DIRECTOR'S OFFICE  
GENERAL INDUSTRY SAFETY AND HEALTH STANDARD  
(By authority conferred on the director of the department of labor and economic  
opportunity by sections 16 and 21 of the Michigan occupational safety and health act, 1974  
pa 154, mcl 408.1016 and 408.1021, and executive reorganization order nos. 1996-2, 2003-1,  
2008-4, 2011-4, and 2019-3, mcl 445.2001, 445.2011, 445.2025, 445.2030, and 125.1998)  
PART 49. SLINGS  
R 408.14901 Scope and adoption of standard.  
Rule 4901. (1) This part sets forth the requirements for slings and their construction,  
care, and use in, around, and about a place of employment. Types of slings included in this  
part are chain, wire rope, metal mesh, 3-strand natural or synthetic rope, and synthetic web  
made from nylon, polyester, and polypropylene.  
(2) The following standard is adopted by reference in these rules, American Society of  
Mechanical Engineers Standard ASME B-30.9 “Slings,” 1990 edition. This standard may be  
purchased from IHS Global, 15 Inverness Way East, Englewood, Colorado, 80112, USA,  
telephone number: 1-800-854-7179 or via the internet at website: http://global.ihs.com at a  
cost as of the time of adoption of these amendments of $60.00.  
(3) The standard adopted in subrule (2) of this rule is also available for inspection at the  
Department of Labor and Economic Opportunity, MIOSHA, Standards and FOIA Section,  
530 West Allegan Street, P.O. Box 30643, Lansing, Michigan, 48909-8143.  
(4) Copies of the standard adopted in subrule (2) of this rule may be obtained from the  
publisher or may also be obtained from the Department of Labor and Economic Opportunity,  
MIOSHA, Standards and FOIA Section, 530 West Allegan Street, P.O. Box 30643, Lansing,  
Michigan, 48909-8143, at the cost charged in this rule, plus $20.00 for shipping and  
handling.  
History: 1979 AC; 2021 MR 9, Eff. May 13, 2021.  
R 408.14902 Rescinded.  
History: 2014 AACS; 2021 MR 9, Eff. May 13, 2021.  
R 408.14903 Definitions; A, B.  
Rule 4903. (1) "Angle of loading" means the inclination of a leg or branch of a sling,  
measured from the horizontal or vertical plane as shown in figure 5, provided that an angle of  
loading of 5 degrees or less from the vertical may be considered a vertical angle of loading.  
Page 1  
(2) "Basket hitch" means a sling configuration whereby the sling is passed under the  
load and has both ends, end attachments, eyes, or handles on the hook or a single master link.  
(3) "Braided wire rope" means a wire rope formed by plaiting component wire ropes.  
(4) "Bridle wire rope sling" means a sling composed of multiple wire rope legs, with  
the top ends gathered in a fitting that goes over the lifting hook.  
History: 1979 AC.  
R 408.14904 Definitions; C.  
Rule 4904. (1) "Cable laid endless sling-mechanical joint" means a wire rope sling made  
endless by joining the ends of a single length of cable laid rope with 1 or more metallic  
fittings.  
(2) "Cable laid grommet-hand tucked" means an endless wire rope sling made from 1  
length of rope wrapped 6 times around a core formed by hand, tucking the ends of the rope  
inside the 6 wraps.  
(3) "Cable laid rope" means a wire rope composed of 6 wire ropes wrapped around a  
fiber or wire rope core.  
(4) "Cable laid rope sling-mechanical joint" means a wire rope sling made from a cable  
laid rope, with eyes fabricated by pressing or swaging 1 or more metal sleeves over the rope  
junction.  
(5) "Choker hitch" means a sling configuration with 1 end of the sling passing under the  
load and through an end attachment, handle, or eye on the other end of the sling.  
(6) "Coating" means an elastomer, or other suitable material, applied to a sling or to a  
sling component to impart desirable properties.  
(7) "Cross rod" means a wire used to join spirals of metal mesh to form a complete  
fabric. (See figure 2 “Metal Mesh Construction”)  
Page 2  
FIGURE 2  
METAL MESH CONSTRUCTION  
History: 1979 AC; 2014 AACS.  
R 408.14905 Definitions; D to H.  
Rule 4905. (1) "Designated" means to be selected or assigned by the employer or the  
employer's representative as being qualified to perform specific duties.  
(2) "Female handle of a choker sling" means a handle with a handle eye and a slot of  
such dimension as to permit passage of a male handle, thereby allowing the use of a metal  
mesh sling in a choker hitch. (See figure 1 “Metal Mesh Sling”)  
(3) "Handle" means a terminal fitting to which metal mesh fabric is attached. (See figure  
1 “Metal Mesh Sling”)  
(4) "Handle eye" means an opening in a handle of a metal mesh sling shaped to accept a  
hook, shackle, or other lifting device. (See figure 1 “Metal Mesh Sling”)  
(5) "Hitch" means a sling configuration whereby the sling is fastened to an object or  
load, either directly to it or around it.  
Page 3  
FIGURE 1  
METAL MESH SLING (Typical)  
History: 1979 AC; 2014 AACS.  
R 408.14906 Definitions; L, M.  
Rule 4906. (1) "Link" means a single ring of a chain.  
(2) "Male handle" or "triangle" means a handle with a handle eye.  
(3) "Master coupling link" means an alloy steel welded coupling link used as an  
intermediate link to join alloy steel chain to master links. (See figure 3 “Major Components  
of a Guadruple Sling”)  
(4) "Master link" or "gathering ring" means a forged or welded steel link used to support  
Page 4  
all members (legs) of an alloy steel chain sling or wire rope sling. (See figure 3 “Major  
Components of a Guadruple Sling”)  
(5) "Mechanical coupling link" means a nonwelded, mechanically closed steel link used  
to attach master links and hooks to alloy steel chain.  
(6) "Metal mesh" or "fabric" means the flexible portion of a metal mesh sling, consisting  
of a series of transverse coils and cross rods.  
FIGURE 3  
MAJOR COMPONENTS OF A GUADRUPLE SLING  
History: 1979 AC; 2014 AACS.  
R 408.14907 Definitions; P to R.  
Rule 4907. (1) "Proof load" means a load applied in performance of a proof test.  
(2) "Proof test" means a nondestructive tension test performed by the sling  
manufacturer, or an equivalent entity, to verify construction and workmanship of a sling.  
(3) "Rated capacity" means the maximum working load permitted by the provisions  
of this part.  
(4) "Reach" means the effective length of an alloy steel chain sling, measured from the  
top bearing surface of the upper terminal component to the bottom bearing surface of the  
lower terminal component.  
Page 5  
History: 1979 AC.  
R 408.14908 Definitions; S to V.  
Rule 4908. (1) "Selvage edge" means the finished edge of synthetic webbing designed  
to prevent unraveling.  
(2) "Sling" means an assembly which connects the load to the material handling  
equipment for the purpose of lifting or hoisting.  
(3) "Sling manufacturer" means a person or organization that assembles sling  
components into their final form for sale to users.  
(4) "Spiral" means a single transverse coil that is the basic element from which metal  
mesh is fabricated. (See figure 2 “Metal Mesh Construction”)  
(5) "Strand laid endless sling-mechanical joint" means a wire rope sling made endless  
from 1 length of rope, with the ends joined by 1 or more metallic fittings.  
(6) "Strand laid grommet-hand tucked" means an endless wire rope sling made from 1  
length of strand wrapped 6 times around a core formed by hand tucking the ends of the strand  
inside the 6 wraps.  
(7) "Strand laid rope" means a wire rope made with strands, usually 6 or 8, wrapped  
around a fiber core, wire strand core, or independent wire rope core.  
(8) "Vertical hitch" means a method of supporting a load by a single, vertical part or leg  
of the sling. (See figure 4 “Basic Sling Configurations with Vertical Legs”)  
Page 6  
FIGURE 4  
BASIC SLING CONFIGURATIONS WITH VERTICAL LEGS  
Page 7  
FIGURE 5  
BLING CONFIGURATIONS WITH ANGLED LEGS  
Not  
Angles 5 degrees or less from the vertical may be considered vertical  
angles.  
es:  
For slings with legs more than 5 degrees off vertical, the actual angle as  
shown in Figure 5 must be considered.  
EXPLANATION OF SYMBOLS: MINIMUM DIAMETER OF CURVATURE  
Represents a contact surface which shall have a diameter of curvature at  
least double the diameter of the rope from which the sling is made  
Represents a contact surface which shall have a diameter of curvature at  
least 8 times the diameter of the rope.  
Page 8  
Represents a load in a choker hitch and illustrates the rotary force on the  
load and/or the slippage of the rope in contact with the load. Diameter of  
curvature of lead surface shall be at least double the diameter of the rope.  
History: 1979 AC; 2014 AACS.  
R 408.14911 General operating practices.  
Rule 4911. (1) Whenever a sling is used, the following practices shall be followed:  
(a) A damaged or defective sling, as described in this standard, shall not be used.  
(b) A sling shall not be shortened with bolts, knots, or other makeshift devices.  
(c) Sling legs shall not be kinked.  
(d) A sling shall not be loaded in excess of its rated capacity.  
(e) A sling used in a basket hitch shall have the load balanced to prevent slipping.  
(f) A sling shall be securely attached to its load.  
(g) A sling, other than an alloy steel chain, shall be padded or protected from the sharp  
corners of its load.  
(h) A suspended load shall be kept clear of all obstructions.  
(i) An employee shall be kept clear of a suspended load and a load about to be lifted.  
(j) An employee's hand or finger shall not be placed between the load and sling while  
the sling is being tightened.  
(k) Slack in a sling shall be removed gradually.  
(l) A sling shall not be pulled from under a load when the load is resting on the sling.  
(2) Employers shall not load a sling in excess of its recommended safe working load as  
prescribed by the sling manufacturer on the identification markings permanently affixed to  
the sling.  
(3) Employers shall not use slings without affixed and legible identification markings.  
History: 1979 AC; 2014 AACS.  
R 408.14912 Inspections generally; removal of sling from service.  
Rule 4912. (1) A sling and all fastenings shall be inspected for damage and defects by a  
designated employee before each day's use.  
(2) Where service conditions warrant, additional inspections shall be performed during  
sling use.  
(3) A damaged or defective sling, as described in this part, shall be immediately  
removed from service.  
History: 1979 AC.  
R 408.14913 Rescinded.  
History: 1979 AC; 1998-2000 AACS.  
Page 9  
ALLOY STEEL CHAIN SLINGS  
R 408.14921 Sling identification.  
Rule 4921. An alloy steel chain sling shall have a permanently affixed, durable  
identification, stating the size, grade, rated capacity, and reach.  
History: 1979 AC; 2014 AACS.  
R 408.14922 Rated capacity of attachments.  
Rule 4922. (1) A hook, ring, oblong link, pear-shaped link, welded or mechanical  
coupling link, or other attachment shall have a rated capacity at least equal to that of the alloy  
steel chain with which they are used, or the sling shall not be used in excess of the rated  
capacity of the weakest component.  
(2) A makeshift link or fastener formed from bolts or rods, or other such attachments,  
shall not be used.  
History: 1979 AC; 2014 AACS.  
R 408.14923 Inspections; records; removal from service; proof testing.  
Rule 4923. (1) In addition to the inspection prescribed by R 408.14912, an employer  
shall designate an employee to make a thorough periodic inspection of an alloy steel chain  
sling in use on a regular basis. An employer shall determine the regularity of inspection  
based on all of the following factors:  
(a) Frequency of sling use.  
(b) Severity of service conditions.  
(c) Nature of lifts being made.  
(d) Experience gained on the service life of slings used in similar circumstances.  
The designated employee shall inspect an alloy steel chain sling at least once every 12  
months.  
(2) The employer shall make and maintain a record of the most recent month in which  
each alloy steel chain sling was thoroughly inspected and shall make the record available for  
examination.  
(3) The employee designated to make the inspection of an alloy steel chain sling shall  
make a thorough inspection for all of the following:  
(a) Wear.  
(b) Defective welds.  
(c) Deformation.  
(d) An increase in length beyond acceptable limits established in this part.  
If the defects or deteriorations are present, then the designated employee shall  
immediately remove the sling from service.  
(4) The employer shall ensure that, before use, each new, repaired, or reconditioned alloy  
steel chain sling, including all welded components in the sling assembly, is proof-tested by  
the sling manufacturer in accordance with ASME B-30.9 “Slings,” 1990 edition, as adopted  
in R 408.14901.  
Page 10  
(5) The employer shall retain a certificate of the proof test and shall make it available  
for examination.  
(6) If the chain size at any point of the link is less than that stated in Table 1, the  
employer shall remove the chain from service.  
TABLE 1  
MINIMUM ALLOWABLE CHAIN SIZE AT ANY POINT OF  
LINK  
Minimum allowable chain size  
Chain size (inches)  
(inches)  
1/4  
13/64  
19/64  
25/64  
31/64  
19/32  
45/64  
13/16  
29/32  
1
3/8  
1/2  
5/8  
3/4  
7/8  
1
1 1/8  
1 1/4  
1 3/8  
1 1/2  
1 3/4  
1-3/32  
1-3/16  
1-13/32  
History: 1979 AC; 1998-2000 AACS; 2014 AACS; 2021 MR 9, Eff. May 13, 2021.  
R 408.14924 Safe operating temperatures.  
Rule 4924. Employers shall permanently remove an alloy steel-chain slings from service  
if it is heated above 1,000 degrees F. When exposed to service temperatures in excess of 600  
degrees F, employers shall reduce the maximum working-load limits permitted by the chain  
manufacturer in accordance with the chain or sling manufacturer's recommendations.  
History: 1979 AC; 2014 AACS.  
R 408.14925 Repairing; reconditioning, and proof testing.  
Rule 4925. (1) A worn or damaged alloy steel chain sling or attachment shall not be  
used until repaired.  
(2) When welding or heat treating is performed, a sling shall not be used unless  
Page 11  
repaired, reconditioned, and proof tested by the sling manufacturer.  
(3) A mechanical coupling link or low carbon steel repair link shall not be used to repair  
broken lengths of chain.  
History: 1979 AC; 2014 AACS.  
R 408.14926 Cracked or deformed links or hooks; removal from service.  
Rule 4926. (1) Alloy steel chain slings with cracked or deformed master links, coupling  
links, or other components shall be removed from service.  
(2) A sling shall be removed from service if the hook is cracked, has been opened more  
than 15% of the normal throat opening measured at the narrowest point, or twisted more than  
10 degrees from the plane of the unbent hook.  
History: 1979 AC; 2014 AACS.  
WIRE ROPE SLINGS  
R 408.14931 Safe operating temperatures; sling use.  
Rule 4931. (1) A wire rope sling shall not be used with loads in excess of the rated  
capacities. A sling shall be used only in accordance with  
recommendations.  
the manufacturer’s  
(2) A fiber core wire rope sling of any grade shall be permanently removed from service  
if it is exposed to a temperature in excess of 200 degrees Fahrenheit.  
(3) When a nonfiber core wire rope sling of any grade is used at a temperature above  
400 degrees Fahrenheit or below minus 60 degrees Fahrenheit, recommendations of the sling  
manufacturer regarding use at that temperature shall be followed.  
(4) Employers shall use only wire-rope slings that have permanently affixed and legible  
identification markings as prescribed by the manufacturer and that indicate the recommended  
safe working load for the type of hitch used, the angle upon which it is based, and the number  
of legs if more than 1.  
History: 1979 AC; 2014 AACS.  
R 408.14932 Minimum sling lengths.  
Rule 4932. (1) Cable laid and a 6 x 19 and 6 x 37 sling shall have a minimum clear  
length of wire rope 10 times the component rope diameter between splices, sleeves, or end  
fittings.  
(2) A braided sling shall have a minimum clear length of wire rope 40 times the  
component rope diameter between the loops or end fittings.  
(3) A cable laid grommet, strand laid grommet, and endless sling shall have a minimum  
circumferential length of 96 times their body diameter.  
History: 1979 AC; 2014 AACS.  
Page 12  
R 408.14933 Welded end attachment; certificate of proof test.  
Rule 4933. (1) Welding of an end attachment, except covers to thimbles, shall be  
performed prior to the assembly of the sling.  
(2) All welded end attachments shall not be used unless proof tested by the  
manufacturer at twice their rated capacity prior to initial use. The employer shall retain a  
certificate of the proof test, and make it available for examination.  
History: 1979 AC; 2014 AACS.  
R 408.14934 Removal from service.  
Rule 4934. A wire rope sling shall be removed from service if any of the following  
conditions are present:  
(a) Ten randomly distributed broken wires in 1 rope lay, or 5 broken wires in 1 strand in  
1 rope lay.  
(b) Wear or scraping of 1/3 the original diameter of outside individual wires.  
(c) Kinking, crushing, bird caging, or any other damage resulting in distortion of the  
wire rope structure.  
(d) Evidence of heat damage.  
(e) End attachments that are cracked, deformed, or worn.  
(f) Hooks that have been opened more than 15% of the normal throat opening measured  
at the narrowest point, or twisted more than 10 degrees from the plane of the unbent hook.  
(g) Corrosion of the rope or end attachments.  
History: 1979 AC; 2014 AACS.  
R 408.14935 Forming eyes.  
Rule 4935. An eye in a wire rope sling shall not be formed by using a knot or a wire  
rope clip.  
History: 1979 AC; 2014 AACS.  
METAL MESH SLINGS  
R 408.14941 Sling marking; rated capacity; coatings.  
Rule 4941. (1) Each metal mesh sling shall have permanently affixed to it a durable  
marking that states the rated capacity for vertical basket hitch and choker hitch loadings.  
(2) A handle shall have a rated capacity at least equal to the metal fabric and exhibit no  
deformation after proof testing.  
(3) Coatings which diminish the rated capacity of a sling shall not be applied.  
History: 1979 AC; 2014 AACS.  
Page 13  
R 408.14942 Attachment of handle.  
Rule 4942. The fabric and handles shall be joined to ensure all of the following:  
(a) The rated capacity of the sling is not reduced.  
(b) The load is evenly distributed across the width of the fabric.  
(c) Sharp edges will not damage the fabric.  
History: 1979 AC; 2014 AACS.  
R 408.14943 Sling testing.  
Rule 4943. All new and repaired metal mesh slings, including handles, shall not be used  
unless proof tested by the manufacturer at a minimum of 1 1/2 times their rated capacity.  
Elastomer impregnated slings shall be proof tested before coating.  
History: 1979 AC; 2014 AACS.  
R 408.14944 Sling use; safe operating temperatures.  
Rule 4944. (1) A metal mesh sling shall not be used to lift loads in excess of their rated  
capacities.  
(2) A sling shall be used only in accordance with the manufacturer’s recommendations.  
(3) A metal mesh sling which is not impregnated with elastomers may be used in a  
temperature range from minus 20 degrees Fahrenheit to plus 550 degrees Fahrenheit without  
decreasing the working load limit.  
(4) A metal mesh sling impregnated with polyvinyl chloride or neoprene may be used  
only in a temperature range from zero degrees to plus 200 degrees Fahrenheit.  
(5) For operations outside these temperature ranges in subrule (3) and (4) of this rule or  
for metal mesh slings impregnated with other materials, the sling manufacturer's  
recommendations shall be followed.  
History: 1979 AC; 2014 AACS.  
R 408.14945 Removal from service; repairs; records.  
Rule 4945. (1) A metal mesh sling shall be immediately removed from service if any of  
the following conditions are present:  
(a) A broken weld or broken brazed joint along the sling edge.  
(b) Reduction in wire diameter of 25% due to abrasion or 15% due to corrosion.  
(c) Lack of flexibility due to distortion of the fabric.  
(d) Distortion of the female handle so that the depth of the slot is increased more than  
10%.  
(e) Distortion of either handle so that the width of the eye is decreased more than 10%.  
(f) A 15% reduction of the original cross sectional area of metal at any point around the  
handle eye.  
(g) Distortion of either handle out of its plane.  
(2) A metal mesh sling which is repaired shall not be used unless repaired by a metal  
Page 14  
mesh sling manufacturer.  
(3) Once repaired, each sling shall be permanently marked or tagged, or a written record  
maintained, to indicate the date and nature of the repairs and the person or organization that  
performed the repairs. Records of repairs shall be made available for examination.  
History: 1979 AC; 2014 AACS.  
NATURAL AND SYNTHETIC FIBER ROPE SLINGS  
R 408.14951 Sling use; rated capacity; diameter of curvature; safe operating  
temperatures.  
Rule 4951. (1) A fiber rope sling made from conventional 3 strand construction fiber rope  
shall not be used with a load in excess of the rated capacities.  
(2) A fiber rope sling shall have a diameter of curvature meeting not less than the  
minimums prescribed in figures 4 and 5.  
(3) A sling shall be used only in accordance with the manufacturer’s recommendations.  
(4) A natural or synthetic fiber rope sling, except for a wet frozen sling, may be used in  
a temperature range from minus 20 degrees Fahrenheit to plus 180 degrees Fahrenheit  
without decreasing the working load limit. For operations outside this temperature range and  
for wet frozen slings, the sling manufacturer's recommendations shall be followed.  
(5) Employers shall use natural and synthetic fiber-rope slings that have permanently  
affixed and legible identification markings stating the rated capacity for the type of hitch  
used and the angle upon which it is based, type of fiber material, and the number of legs if  
more than 1.  
History: 1979 AC; 2014 AACS.  
R 408.14952 Splicing.  
Rule 4952. A spliced fiber rope sling shall not be used unless it has been spliced in  
accordance with the following minimum requirements and in accordance with any additional  
recommendations of the manufacturer:  
(a) In manila rope, an eye splice shall consist of at least 3 full tucks, and short splices  
shall consist of at least 6 full tucks, 3 on each side of the splice center line.  
(b) In synthetic fiber rope, an eye splice shall consist of at least 4 full tucks, and short  
splices shall consist of at least 8 full tucks, 4 on each side of the center line.  
(c) A strand end tail shall not be trimmed flush with the surface of the rope immediately  
adjacent to the full tucks. This applies to all types of fiber rope and both eye and short  
splices. For fiber rope under 1 inch in diameter, the tail shall project at least 6 rope diameters  
beyond the last full tuck. For fiber rope 1 inch in diameter and larger, the tail shall project at  
least 6 inches beyond the last full tuck. Where a projecting tail interferes with the use of the  
sling, the tail shall be tapered and spliced into the body of the rope, using at least 2 additional  
tucks, which will require a tail length of approximately 6 rope diameters beyond the last full  
tuck.  
Page 15  
(d) A fiber rope sling shall have a minimum clear length of rope between eye splices  
equal to 10 times the rope diameter.  
(e) A knot shall not be used in lieu of a splice.  
(f) A clamp not designed specifically for fiber ropes shall not be used for splicing.  
(g) For any eye splice, the eye shall be of a size to provide an included angle of not  
greater than 60 degrees at the splice when the eye is placed over the load or support.  
History: 1979 AC; 2014 AACS.  
R 408.14953 End attachments.  
Rule 4953. A fiber rope sling shall not be used if an end attachment in contact with the  
rope has a sharp edge or projection.  
History: 1979 AC; 2014 AACS.  
R 408.14954 Removal from service; prohibition.  
Rule 4954. (1) A natural and synthetic fiber rope sling shall be immediately removed  
from service if any of the following conditions are present:  
(a) Abnormal wear.  
(b) Powdered fiber between strands.  
(c) Broken or cut fibers.  
(d) Variations in the size or roundness of strands.  
(e) Discoloration or rotting.  
(f) Distortion of hardware in the sling.  
(2) Only a fiber rope sling made from new rope shall be used. Use of a repaired or  
reconditioned fiber rope sling is shall not be used.  
History: 1979 AC; 2014 AACS.  
SYNTHETIC WEB SLINGS  
R 408.14961 Marking or coding rated capacities.  
Rule 4961. Each sling shall be marked or coded to show the rated capacities for each  
type of hitch and type of synthetic web material.  
History: 1979 AC; 2014 AACS.  
R 408.14962 Webbing size and edges.  
Rule 4962. Synthetic webbing shall be of uniform thickness and width, and selvage  
edges shall not be split from the webbing's width.  
History: 1979 AC; 2014 AACS.  
Page 16  
R 408.14963 Fittings.  
Rule 4963. (1) Fittings shall be both of the following:  
(a) Of a minimum breaking strength equal to that of the sling.  
(b) Free of all sharp edges that could in any way damage the webbing.  
(2) Stitching shall be the only method used to attach end fittings to webbing and to form  
eyes. The thread shall be in an even pattern and contain a sufficient number of stitches to  
develop the full breaking strength of the sling.  
History: 1979 AC; 2014 AACS.  
R 408.14964 Use; safe operating temperatures.  
Rule 4964.  
(1) When a synthetic web sling is used, the following precautions shall be taken:  
(a) A nylon web sling shall not be used where fumes, vapors, sprays, mists, or liquids of  
acids or phenolics are present.  
(b) A polyester and polypropylene web sling shall not be used where fumes, vapors, sprays,  
mists, or liquids of caustics are present.  
(c) A web sling with aluminum fittings shall not be used where fumes, vapors, sprays,  
mists, or liquids of caustics are present.  
(2) A synthetic web sling of polyester and nylon shall not be used at a temperature in  
excess of 180 degrees Fahrenheit.  
(3) A polypropylene web sling shall not be used at a temperature in excess of 200  
degrees Fahrenheit. (See figure 6 “Basic Synthetic Web Sling Constructions.”)  
Page 17  
FIGURE 6  
BASIC SYNTHETIC WEB SLING CONSTRUCTIONS  
Page 18  
History: 1979 AC; 2014 AACS.  
R 408.14965 Removal from service; repairs; certificate of proof test; prohibition.  
Rule 4965. (1) A synthetic web sling shall be immediately removed from service if  
any of the following conditions are present:  
(a) Acid or caustic burns.  
(b) Melting or charring of any part of the sling surface.  
(c) Snags, punctures, tears, or cuts.  
(d) Broken or worn stitches.  
(e) Distortion of fittings.  
(2) A synthetic web sling shall be repaired only by a sling manufacturer.  
(3) Each repaired sling shall be proof tested by the manufacturer to twice the rated  
capacity prior to its return to service. The employer shall retain a certificate of the proof  
test and make it available for examination.  
(4) A sling, including webbing and fittings, which has been repaired in a temporary  
manner shall not be used.  
History: 1979 AC; 2014 AACS.  
Page 19  
;