ASTM D6799-23

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Designation: D6799 − 13 (Reapproved 2019) D6799 − 23
Standard Terminology Relating to
Inflatable Restraints
This standard is issued under the fixed designation D6799; 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 standard covers terminology which is used in the evaluation of inflatable restraint fabrics, cushions, and modules.
1.2 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
D123 Terminology Relating to Textiles
D3990 Terminology Relating to Fabric Defects
3. Terminology
3.1 Definitions:
abrasion, n—for inflatable restraint fabrics, a fuzzy cluster of broken filaments damaged by scraping.
accelerated aging, n— in textile processing and testing, the use of controlled environmental conditions to promote rapid
physical or chemical change in a textile material.
DISCUSSION—
For inflatable restraints, practices for conducting accelerated aging are designed to determine the aggravated effects on a fabric from exposures to heat,
humidity, or ozone, or a combination thereof. These environmental conditions may also be cycled in combination. The four accelerated aging
procedures of concern to the design and manufacture of inflatable restraints are referred to as cycle aging, heat aging, humidity aging, and ozone aging.
adhesive failure, n—for inflatable restraint sealed and sewn seams, a failure of seam sealant at the interface of two substrates
where the sealant is sheared such that a portion of the sealant greater than 90 % of the original thickness of the sealant layer
must remain attached to one of the two substrate surfaces, while a portion of the sealant less than 10 % of the original thickness
of the sealant layer must remain attached to the other of the two substrate surfaces.
air splice, n—for inflatable restraint fabrics, the thicker portion of a yarn resulting from the entanglement of the filaments at
the ends of two multifilament yarns to create a continuous yarn.
This terminology is under the jurisdiction of ASTM Committee D13 on Textiles and is the direct responsibility of Subcommittee D13.20 on Inflatable Restraints.
Current edition approved Jan. 1, 2019June 1, 2023. Published March 2019September 2023. Originally approved in 2005. Last previous edition approved in 20132019 as
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D6799 – 13 . DOI: 10.1520/D6799-13R19.(2019). DOI: 10.1520/D6799-23.
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D6799 − 23
average dynamic air permeability (ADAP), n—for inflatable restraints, the average of all of DAP measurements within a
specified range of pressure differentials.
bleedthrough, n— for coated inflatable restraint fabrics, the presence of coating material on the uncoated side, between two
yarns, without covering either yarn.
blip, n—for inflatable restraint fabrics, any short, irregularly shaped or textured portion of an individual multifilament yarn that
has been woven into the fabric, including slough offs, stripbacks, fuzz balls, snarls, and slubs.
breakout pressure, n— for inflatable restraints, the pressure level during deployment which ruptures the module cover.
broken filament, n— for inflatable restraint fabrics, an individual filament, separated from a multifilament yarn bundle, that lies
on the surface of the fabric.
bruise, n—for inflatable restraint fabrics, a shift in the squareness of the weave pattern in an area that has been subjected to
impact or pressure.
coated fabric, n—a flexible material composed of a textile fabric and an adherent polymeric material applied to one or both
sides.
coating slub, n— for coated inflatable restraint fabrics, an irregularly shaped lump of coating material on the surface of the
coated layer resembling a yarn slub.
coating streak, n— for coated inflatable restraint fabrics, minor variation in the color or opacity of the coated layer.
coating transfer, n— for coated inflatable restraint fabrics, the presence of coating material on the uncoated side, covering one
or more yarns.
cohesive failure, n—for inflatable restraint sealed and sewn seams, a failure of seam sealant at the interface of two substrates
where the sealant is sheared such that a portion of the sealant greater than 10 % of the original thickness of the sealant layer
must remain attached to both of the two substrate surfaces.
contamination, n— for coated inflatable restraint fabrics, the presence of non-coating material in the coated layer.
cushion, n—for inflatable restraints, the inflatable fabric envelope portion of a module.
cushion overpressurization, n—for inflatable restraints, the process of inflating a cushion at internal pressures greater than
design deployment pressures; bag burst.
defect, n—specific for inflatable restraints, an imperfection in a cut piece of fabric that judgment and experience indicate is
likely to result in either hazardous or improper deployment of the inflatable restraint module in which the imperfection is
incorporated.
DISCUSSION—
An example of a defect is a hole in the piece of fabric through which inflation gases can vent improperly.
deployment, n—for inflatable restraints, the sequence of events related to the activation of a module.
dynamic air permeability (DAP), n—for inflatable restraints, the dynamic air permeability measured at a single specified
pressure differential.
D6799 − 23
edgecombing, n— for inflatable restraints, the separation of yarns from their normal orthagonal configuration in a woven fabric
due to seam stress or similar action near the edge of a cut part
environmental conditions, n—in textile testing, the atmosphere in which specified moisture levels, temperature ranges, and
concentrations of gases are controlled.
exponent of dynamic air permeability (EXP), n—for inflatable restraints, a descriptive factor used in a mathematical model
integral to the apparatus software which relates the change in dynamic air permeability as the pressure differential changes.
extractable matter, n— for inflatable restraint fabrics,, non fibrous material in or on a textile, not including water, which is
removable by a specified solvent or solvents, as directed in a specified procedure.
filling bar, n— for inflatable restraint fabrics, a temporary change in the filling-wise density of the weave pattern. (Syn:
stop/start mark.)
finished, adj—for inflatable restraint fabrics, a descriptive term for fabric that has been treated after weaving and that is suitable
for coating or piece cutting.
flat fabric, n— for inflatable restraints, fabric composed of a single woven layer. (See also one-piece woven).
fold over, n—for inflatable restraint fabrics, a hard ridge where a layer is overlapped upon itself where if applicable coating
integrity is compromised.
foreign matter, n— for inflatable restraint fabrics, an extraneous interwoven fragment whose size, color, or texture indicates
that it is not of the same material as the fibers in the base fabric.
grading, n—the procedure used to identify and quantify the number of imperfections in a roll of fabric detected during visual
inspection.
hard contamination, n— for coated inflatable restraint fabrics, the presence of non-coating material within or on the coating
layer, such material visibly appearing to be of large size, coarse or sharp in texture, and of a thickness that protrudes significantly
above the surface of the coating layer.
DISCUSSION—
Examples are metal filings, glass, plastic, or wood splinters.
DISCUSSION—
Side lighting of fabric during fabric inspection may be used to determine how significantly contamination protrudes from the surface of the fabric.
heavy coating streak, n— for coated inflatable restraint fabrics, a narrow area of fabric, generally in the shape of a line oriented
in the warp direction of the fabric, in which the coating layer is visibly at a higher rate of coverage than the surrounding material.
hole, n—for inflatable restraint fabrics, an opening not characteristic of the normal weave pattern where one or more yarns is
cut, torn, or shifted.
imperfection, n—a departure of a quality characteristic from its intended level or state.
inflatable restraint, n—a vehicular safety device designed to cushion an occupant or equipment during collision; an airbag.
inflator, n—for inflatable restraints, a device for generating and directing expansion gases into a cushion.
D6799
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