ISO 16604:2004

INTERNATIONAL ISO
STANDARD 16604
First edition
2004-04-01
Clothing for protection against contact
with blood and body fluids —
Determination of resistance of protective
clothing materials to penetration by
blood-borne pathogens — Test method
using Phi-X174 bacteriophage
Vêtements de protection contre les contacts avec le sang et les fluides
corporels — Détermination de la résistance à la pénétration par des
pathogènes véhiculés par le sang des matériaux entrant dans la
fabrication des vêtements de protection — Méthode d'essai utilisant le
bactériophage Phi-X174
Reference number
©
ISO 2004
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ii © ISO 2004 – All rights reserved

Contents Page
Foreword. iv
Introduction . v
1 Scope. 1
2 Normative references . 1
3 Terms and definitions. 1
4 Principle . 4
5 Microorganisms and reagents. 4
6 Apparatus and materials . 5
7 Test specimens . 6
7.1 Selection . 6
7.2 Preparation of test specimens. 6
8 Procedure. 6
8.1 Preparation of test media. 6
8.2 Preparation of controls. 7
8.3 Determination of material compatibility . 8
8.4 Procedure for preparation of bacteriophage suspension . 8
8.5 Preparation of settle plates. 9
8.6 Preliminary material measures. 9
8.7 Preparation of test cell . 9
8.8 Exposure of material to bacteriophage challenge suspension. 10
8.9 Procedure for quantification of assay fluid. 11
8.10 Interpretation of tests results . 12
9 Test report. 12
Annex A (informative) Sources of supplies and apparatus . 15
Bibliography . 16

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 16604 was prepared by Technical Committee ISO/TC 94, Personal safety — Protective clothing and
equipment, Subcommittee SC 13, Protective clothing. It is based on ASTM F1671-97b.
iv © ISO 2004 – All rights reserved

Introduction
Workers, primarily those in the health care profession, involved in treating and caring for individuals injured or
sick, can be exposed to biological liquids capable of transmitting disease. These diseases, which may be
caused by a variety of microorganisms, can pose significant risks to life and health. This is especially true of
blood-borne viruses which cause hepatitis [hepatitis B virus (HBV) and hepatitis C virus (HCV)] and acquired
immune deficiency syndrome (AIDS) [human immunodeficiency viruses (HIV)]. Since engineering controls
cannot eliminate all possible exposures, attention is placed on reducing the potential of direct skin contact
through the use of protective clothing.
This International Standard is concerned with protective clothing and related protective devices designed to
protect against the penetration of blood or body fluids.
Given the variety of health care settings, activities, and the potential for exposure to blood or body fluids, the
barrier requirements for protective clothing materials will change with the application.
This International Standard describes a hydrostatic pressure test for measuring the viral penetration
resistance of clothing materials to a surrogate virus. The choice of an appropriate test method depends on the
specific application of protective clothing and its intended use. A risk assessment should be performed to

[1]
determine the level of risk for determining the appropriate test method.
This test method does not apply to all forms or conditions of blood-borne pathogen exposure. Users of this
test method should review modes for worker/clothing exposure and assess the appropriateness of this test
method for their specific applications. This test method has been specifically defined for modelling the viral
penetration of hepatitis (B and C) and human immunodeficiency viruses transmitted in blood and other
potentially infectious body fluids. The surrogate microbe, Phi-X174 bacteriophage, used in this test method, is
similar to HCV in size and shape but also serves as a surrogate for HBV and HIV. Inferences for protection
from other pathogens should be assessed on a case-by-case basis.
This test method addresses only the performance of materials or certain material constructions (e.g. seams)
used in protective clothing. This test method does not address the design, overall construction and
components, or interfaces of garments or other factors which may affect the overall protection offered by the
protective clothing. It is emphasized that the test does not necessarily simulate conditions that clothing
materials are likely to be exposed to in practice. The use of test data should therefore be restricted to broad
comparative assessment of such material according to their viral penetration resistance characteristics.
Testing prior to degradation by physical, chemical, and thermal stresses which could negatively impact the
performance of the protective barrier, could lead to a false sense of security. Consider tests which assess the
impact of sterilization, storage conditions, and shelf life on the penetration resistance for disposable products,
and the effects of laundering and sterilization on the penetration resistance for reusable products. The integrity
[1]
of the protective barrier can also be compromised during use by such effects as flexing and abrasion. It is
also possible that pre-wetting by contaminating materials such as alcohol and perspiration also compromises
the integrity of the protective barrier. If these conditions are of concern, evaluate the performance of protective
clothing materials for Phi-X174 bacteriophage penetration following an appropriate preconditioning technique
representative of the expected conditions of use.
Medical protective clothing materials are intended to be a barrier to blood, body fluids, and other potentially
infectious materials. Many factors can affect the wetting and penetration characteristics of body fluids, such as
surface tension, viscosity, and polarity of the fluid, as well as the structure and relative hydrophilicity or
hydrophobicity of the materials. The surface tension range for blood and body fluids (excluding saliva) is
[2]
approximately 0,042 N/m to 0,060 N/m. In order to help simulate the wetting characteristics of blood and
body fluids, the surface tension of the Phi-X174 bacteriophage challenge suspension is adjusted to
approximate the lower end of this surface tension range. The resulting surface tension of the Phi-X174
bacteriophage challenge suspension is (0,042 ± 0,002) N/m.
Part of this method for exposing the protective clothing material specimens with Phi-X174 bacteriophage
challenge suspension involves pressurization of the test cell to 14,0 kPa (in Procedures A and B). This
hydrostatic pressure has been documented to produce test results that correlate with visual penetration
[3]
results that are obtained with a human factors validation. Some studies, however, suggest that mechanical
[4] [5]
pressures exceeding 345 kPa can occur during clinical use. Therefore, it is important to understand that
this test method does not simulate all the physical stresses and pressures that are exerted on protective
clothing garments during actual use. Procedures C and D use a stepped pressurization approach with
pressures up to 20,0 kPa. These procedures simulate a range of possible pressures for ranking material
performance.
vi © ISO 2004 – All rights reserved

INTERNATIONAL STANDARD ISO 16604:2004(E)

Clothing for protection against contact with blood and body
fluids — Determination of resistance of protective clothing
materials to penetration by blood-borne pathogens — Test
method using Phi-X174 bacteriophage
1 Scope
This International Standard describes a laboratory test method for measuring the resistance of materials used
in protective clothing to penetration by blood-borne pathogens. This test method uses a surrogate microbe
under conditions of continuous liquid contact. Protective clothing “pass/fail” determinations are based on the
detection of viral penetration at a specific hydrostatic pressure using the ISO 13994 test apparatus.
This test method is not always effective in testing protective clothing materials having thick, inner liners which
readily absorb the challenge fluid.
This test method involves a sensitive assay procedure. Because of the length of time required to complete this
test method, it might not be suitable for use as a material or protective clothing quality control or assurance
procedure.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 304, Surface active agents — Determination of surface tension by drawing up liquid films
ISO 3696:1987, Water for analytical laboratory use — Specification and test methods
ISO 3801, Textiles — Woven fabrics — Determination of mass pe
...