ASTM D6799-05

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D 6799 – 05
Standard Terminology Relating to
Inflatable Restraints
This standard is issued under the fixed designation D 6799; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope bleedthrough, n—for coated inflatable restraint fabrics, the
presence of coating material on the uncoated side, between
1.1 This standard covers terminology which is used in the
two yarns, without covering either yarn.
evaluation of inflatable restraint fabrics, cushions, and mod-
blip, n—for inflatable restraint fabrics, any short, irregularly
ules.
shaped or textured portion of an individual multifilament
2. Referenced Documents yarn that has been woven into the fabric, including slough
offs, stripbacks, fuzz balls, snarls, and slubs.
2.1 ASTM Standards:
breakout pressure, n—for inflatable restraints, the pressure
D 123 Terminology Relating to Textiles
level during deployment which ruptures the module cover.
D 3990 Terminology Relating to Fabric Defects
broken filament, n—for inflatable restraint fabrics, an indi-
3. Terminology
vidual filament, separated from a multifilament yarn bundle,
that lies on the surface of the fabric.
3.1 Definitions:
bruise, n—for inflatable restraint fabrics, a shift in the
abrasion, n—for inflatable restraint fabrics, a fuzzy cluster of
squareness of the weave pattern in an area that has been
broken filaments damaged by scraping.
subjected to impact or pressure.
accelerated aging, n—in textile processing and testing,theuse
coating slub, n—for coated inflatable restraint fabrics, an
of controlled environmental conditions to promote rapid
irregularly shaped lump of coating material on the surface of
physical or chemical change in a textile material.
the coated layer resembling a yarn slub.
coating streak, n—for coated inflatable restraint fabrics,
DISCUSSION—For inflatable restraints, practices for conducting accel-
erated aging are designed to determine the aggravated effects on a minor variation in the color or opacity of the coated layer.
fabric from exposures to heat, humidity, or ozone, or a combination
coating transfer, n—for coated inflatable restraint fabrics, the
thereof. These environmental conditions may also be cycled in combi-
presence of coating material on the uncoated side, covering
nation. The four accelerated aging procedures of concern to the design
one or more yarns.
and manufacture of inflatable restraints are referred to as cycle aging,
contamination, n—for coated inflatable restraint fabrics, the
heat aging, humidity aging, and ozone aging.
presence of non-coating material in the coated layer.
air splice, n—for inflatable restraint fabrics, the thicker
cushion, n—for inflatable restraints, the inflatable fabric
portion of a yarn resulting from the entanglement of the
envelope portion of a module.
filaments at the ends of two multifilament yarns to create a
cushion overpressurization, n—for inflatable restraints, the
continuous yarn.
process of inflating a cushion at internal pressures greater
average dynamic airpermeability (ADAP), n—for inflatable
than design deployment pressures; bag burst.
restraints, the average of all of DAP measurements within a
defect, n—specific for inflatable restraints, an imperfection in
specified range of pressure differentials.
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.
ThisterminologyisunderthejurisdictionofASTMCommitteeD13onTextiles
and is the direct responsibility of Subcommittee D13.20 on Inflatable Restraints.
DISCUSSION—An example of a defect is a hole in the piece of fabric
Current edition approved April 1, 2005. Published April 2005.
through which inflation gases can vent improperly.
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
deployment, n—for inflatable restraints, the sequence of
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. events related to the activation of a module.
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D6799–05
dynamic airpermeability (DAP), n—for inflatable restraints, of fabric that judgment and experience indicate is likely to
the dynamic air permeability measured at a single specified have no bearing on subsequent use or processing of the
pressure differential. fabric.
edgecombing, n—for inflatable restraints, the separation of
DISCUSSION—Examples of minor imperfections are a seam mark and
yarns from their normal orthagonal configuration in a woven
a stop/start mark.
fabric due to seam stress or similar action near the edge of a
missing coating, n—for coated inflatable restraint fabrics,
cut part
portions of the coated layer containing exposed base fabric
environmental conditions, n—in textile testing, the atmo-
or scrape marks in the coated layer.
sphere in which specified moisture levels, temperature
missing yarn, n—for inflatable restraint fabrics, a yarn
ranges, and concentrations of gases are controlled.
discontinuity resulting in a change in weave pattern.
exponent of dynamic air permeability (EXP), n—for inflat-
misweave, n—for inflatable restraint fabrics, a change in the
able restraints, a descriptive factor used in a mathematical
weave pattern caused by incorrect interlacing or insertion of
model integral to the apparatus software which relates the
a yarn. (Includes mispick, wrong, draw, jerk-in.)
change in dynamic air pe
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