Standard Test Method of
Small-Scale Evaluation of Fire-Retardant Paints (2-Foot
Tunnel Method)1

This standard is issued under the fixed designation D 3806; 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

1.1 This test method determines the protection a coating
affords its substrate, and the comparative burning characteristics of coatings by evaluating the flame spread over the surface
when ignited under controlled conditions in a small tunnel.
This establishes a basis for comparing surface-burning characteristics of different coatings without specific consideration of
all the end-use parameters that might affect surface-burning
characteristics under actual fire conditions.

1.2 In addition to the experimental flamespread rate, the
weight of panel consumed, time of afterflaming and afterglow,
char dimensions and index, and height of intumescence may be
measured in this test. However, a relationship should not be
presumed among these measurements.

1.3 This standard should be used to measure and describe
the properties of materials, products, or assemblies in response
to heat and flame under controlled laboratory conditions, and
should not be used to describe or appraise the fire hazard or fire
risk of materials, products, or assemblies under actual fire
conditions. However, results of this test may be used as
elements of a fire risk assessment which takes into account all
of the factors which are pertinent to an assessment of the fire
hazard of a particular end use.

1.4 The values stated in inch-pound units are to be regarded
as the standard. The values given in parentheses are for
information only.

1.5 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

2. Referenced Documents

2.1 ASTM Standards:
C 220 Specification for Flat Asbestos-Cement Sheets2
D 344 Test Method for Relative Hiding Power of Paints by

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