(a) Drawings. The drawings and specifications submitted with the application for the tests and the final drawings and specifications that the manufacturer must submit to the Bureau before the approval is granted to show the details of the supplied-air respirator as approved will be retained by the Bureau. The drawings are used to identify the respirator parts in the approval and as a means of checking the future commercial product of the manufacturer.

(b) Actual equipment. If the Bureau so desires, parts of the supplied-air respirator or a complete device used in the tests may be retained as a permanent record of the investigation and of the respirator submitted. Other apparatus will be returned, transportation charges collect, to the manufacturer if he so requests in writing. If the supplied-air respirator is approved the Bureau will require the manufacturer, as soon as his first permissible respirators are available, to submit gratis one complete respirator, with approval labels attached, as a record of his commercial product.

(c) Revision of requirements. In the original preparation and the subsequent revisions of these requirements there has been a continued endeavor to provide for the safe, durable, and practical_devices that will meet not only the demands of the existing situations for which supplied-air respirators are designed, but also the demands of potential and anticipated situations. However, with the continued adaptation of these devices to new situations and conditions it is possible that instances might arise where the protection afforded would be inadequate. The Bureau of Mines, with the cooperation of the manufacturers of supplied-air respirators and the users of such respirators, endeavors to be alert to these new situations. When any situation arises in which inadequacy of protection or unusual hazard attending the use of an approved device is established, the manufacturer or manufacturers of any devices involved are requested to affix caution statements or, if necessary, to cease marketing the device for the particular situation or condition until such changes or provisions as will provide adequate protection are made, it being understood that any provisions or changes made must be submitted to the Bureau of Mines and have this Bureau's approval before they are adopted. Should the situation require a change in the basic requirements and/or tests provided in this part, such changes will be issued as a supplement to the current schedule (this part) and later incorporated in a revision.*+

**For statutory and source citations, see note to § 12.0.

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Geological Survey regulations relating to first-aid equipment and mine rescue apparatus: See §§ 211.101-211.106.

Section 13.0 Compliance with the requirements necessary for obtaining approval. To receive approval of the Bureau of Mines for any gas masks a manufacturer must comply with the requirements specified in this part.*†

*§§ 13.0 to 13.20, inclusive, issued under the authority contained in sec. 311, 47 Stat. 410; 30 U.S.C. 7; E.O. 6611, Feb. 22, 1934.

†The source of §§ 13.0 to 13.20, inclusive, is Schedule 14D, Secretary of the Interior, May 9, 1935.

13.1 Preliminary statement. The Bureau of Mines is prepared at its Central Experiment Station, Pittsburgh, Pa. to conduct tests of gas masks for the purpose of determining their permissibility for use in air containing limited percentages of certain irrespirable gases, vapors, and smokes.

This part is for the information and guidance of those who may desire to submit gas masks for test. It supersedes for this purpose Schedules and Supplements 14, 14A, 14B, and 14C and becomes effective on the date of its approval by the Secretary of the Interior. Lists of permissible gas masks are published from time to time.*† 13.2 Definition of a permissible gas mask. The Bureau of Mines considers a gas mask permissible for use in air containing certain irrespirable gases, smokes, and the like if all the details of construction and the chemical properties of the absorbent are the same in all respects as those of the gas masks that met the requirements and passed the inspection and tests of the Bureau of Mines as described in this part.**

13.3 Classes of canisters. As regards their design and approval, gas-mask canisters are subdivided into the following classes or types:

Type A. For acid gases, such as chlorine, formic acid, hydrogen chloride, hydrogen cyanide, hydrogen sulphide, phosgene, and sulphur dioxide.

Type B. For organic vapors such as acetone, alcohol, aniline, benzene, carbon bisulphide, carbon tetrachloride, chloroform, ether, formaldehyde, gasoline and petroleum distillates, toluene, and similar volatile compounds.

Type C. For ammonia.

Type D. For carbon monoxide.

Type E. For dusts, chemical smokes, fumes, and mists, such as tin tetrachloride, silicon tetrachloride, titanium tetrachloride, and sul

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*For statutory and source citations, see note to § 13.0.

phur trioxide. This classification applies only to gas mask canisters equipped with filters, and not to devices designed solely for protection against dusts and which usually are termed filter-type dust respirators. The requirements for respirators are described in Schedule 21, Part 14.

Type F. For other special gases.

Types AB, ABC, etc. For combinations of the preceding types. Type N. For combinations to include all of the preceding types.** 13.4 Conditions under which gas masks will be tested—(a) Consultation. Manufacturers or their representatives may visit the Pittsburgh Experiment Station of the Bureau of Mines to obtain criticisms of proposed designs or to discuss the requirements of this part in connection with the mask to be submitted. No charge is made for this consultation, and no written report will be given.

(b) Application. Before the Bureau of Mines will undertake active investigation of any gas masks, manufacturers shall have filed an application in the form of a letter which contains: (1) description and complete drawings of the device and any supplementary printed matter; (2) a statement that the device is completely developed and of the design and materials which the manufacturer believes suitable for a finished manufactured device; (3) a statement that the device has been subjected to inspections and tests of the nature described in this part and that it has met these requirements when tested by the manufacturer or his testing agency; and (4) a request that the necessary inspections and tests leading to approval be made. No device will be accepted for permissibility tests unless it is in the completed form in which it is to be marketed. Application for tests shall be indicative of this understanding by the manufacturer. The application shall be addressed to the Director, United States Bureau of Mines, Washington, D. C. A copy of the application, together with a duplicate set of all drawings and printed matter and one complete specimen of the device for which approval is desired, shall be sent to the Supervising Engineer, United States Bureau of Mines, 4800 Forbes Street, Pittsburgh, Pa.

On receipt of this application, descriptive material, and specimen to be tested the manufacturer will be notified by the Bureau of Mines concerning this Bureau's action on the application, the amount of fees necessary, the amount of material required for test, and any additional information or specifications deemed necessary. The manufacturer shall in turn furnish the information and material necessary, together with a certified check or bank draft payable to the Treasurer of the United States to cover the fees for inspection and tests. This fee shall be sent to the Director, United States Bureau of Mines, Washington, D. C. The information regarding the device and all material for tests shall be sent to the Supervising Engineer, United States Bureau of Mines, 4800 Forbes Street, Pittsburgh, Pa. The check for fees will be placed on special deposit in the Treasury of the United States pending disposal as hereinafter specified.**

**For statutory and source citations, see note to § 13.0.

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(b) Type B-Organic vapors, complete mask.

13.5 Fees for testing gas masks. The following schedule of fees is charged for investigation of masks under this part:

(a) Type A-Acid gases, complete mask_.

(c) Type C-Ammonia__.

(d) Type D-Carbon monoxide___.

$400

220

120

300

(e) Type E-Dusts, smokes, mists in combination with a gas or gases. Fee in addition to that required for tests with gases..

150

(f) Type AB-Acid gas and organic vapor mask_.

600

(g) Complete mask with canister designed for a single gas (except carbon monoxide).

120

(h) Facepiece testing, complete_

20

(i) Canister testing alone will be fee for complete mask minus fee for facepiece.

(j) Extension of approval to another gas (except carbon monoxide) or retesting with a gas in case of failure_.

(k) Extension of approval to another gas used only as warning agent---(1) Type N universal gas mask for all gases, including filters for dusts, smokes, and mists.

20

900

If a gas mask fails to pass the specified tests and the manufacturer decides to terminate consideration of the device, a portion of the fee representing the work done will be turned into the Treasury of the United States and the remainder returned to the manufacturer. If it is desired to resubmit the mask for approval after the necessary improvements have been made, an additional fee will be required. The amount of fee charged will be proportional to the additional tests that must be made and will be specified to the applicant in advance of resubmission of the device.

The fees specified herein may be increased to cover the cost of testing an unusually complicated apparatus or performing unusually difficult tests and also are subject to change upon the recommendation of the Director of the Bureau of Mines and the approval of the Secretary of the Interior.**

13.6 Drawings and specifications required. Masks submitted for approval will not be inspected or tested until a complete description and a full set drawings showing all the details of construction have been delivered to the supervising engineer at the United States Bureau of Mines Pittsburgh Experiment Station.

The description of the mask shall include a statement of the chemical composition of the absorbent, which will be kept confidential by the Bureau if so desired by the manufacturer.

The Bureau of Mines will not be responsible for any disclosure of ideas, principles, or patentable features apparent from visual inspection, because under the terms of the application for tests it is understood that the device is ready for release to public market.*+

13.7 Requirement concerning chemical control of absorbents. The capacities of absorbents for gases may vary over wide limits, depending on the materials used and the conditions under which each lot is manufactured. To maintain the quality of protection equal to that of devices submitted for permissibility tests and to which approval may be granted, the Bureau of Mines considers it necessary that each lot of absorbent produced or obtained by a manufacturer be

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**For statutory and source citations, see note to § 13.0.

adequately sampled and tested for capacity before being used in approved gas masks. For these reasons the Bureau requires a statement with each application for permissibility tests which will show the nature, the adequacy, and the continuity of the control provided by the applicant. If deemed desirable and requested by the Bureau of Mines the manufacturer shall grant permission for a representative of this Bureau to make a personal inspection of the control-test equipment, the personnel conducting the control tests, and the control-test records. Tests for approval will be made only after the Bureau is satisfied of the effectiveness of such control, and approvals once granted will remain in force only while the control is sustained.** 13.8 Markings required. Each gas mask shall have marked on it distinctly the name of the manufacturer and the name, letter, or number by which the type is designated for trade purposes.**

13.9 Material required for investigation. The number of complete masks and replacement parts required will depend upon the type and design of the device. After receipt of his application for test the manufacturer will be notified concerning the material that he must submit. All material for test shall be delivered gratis and prepaid by the manufacturer to the Pittsburgh Experiment Station, United States Bureau of Mines, 4800 Forbes Street, Pittsburgh, Pa., marked "Attention of the Supervising Engineer." Unless otherwise arranged with the supervising engineer in writing, all material submitted by the manufacturer will remain the property of the Bureau of Mines for record purposes.**

13.10 Date for conducting tests. The tests will be made in the order that the applications for test are received, provided that all pretest conditions have been fulfilled by the manufacturer, who will be notified of the date on which tests will be started. If a device fails to meet any of the requirements it shall lose its order of precedence. Tests will be resumed following completion of the tests of devices on which work is in progress at the time both the request and materials for retesting are received. Exceptions to this are minor tests or inspections which may be performed simultaneously with other work in the laboratory."

13.11 Witnesses. No one is to be present at these tests except the necessary Government officials, their assistants, and representatives of the manufacturer of the gas mask to be tested. If the manufacturer's representative is a person other than an official known to the supervising engineer of the Pittsburgh Experiment Station he must have credentials which show that he has been authorized to witness the tests. The details of the results of tests shall be regarded as confidential by all present at the tests and shall not be made public in any way prior to their official publication by the Bureau of Mines. The manufacturer or his representative shall understand and agree that compliance with the request to keep the results of the tests confidential is one of the requirements for approval and for maintenance of approval.**

*For statutory and source citations, see note to § 13.0.

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