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M2-Standard for Inspection of Treated Timber Products.
M3-Standard Quality Control Procedures for Wood Preserving Plants.
M4-Standard for the Care of Pressure-Treated Wood Products.
M5-Glossary of Terms Used in Wood Preservation.
M6-Brands Used on Forest Products.
P4-Standard for Petroleum Oil for Blending with Creosote.
P8-Standards for Oil-Borne Preservatives.
P9-Standards for Solvents for Oil-Borne Preservatives.
(Copies of the Standards and Instructions of the American Wood-Preservers' Association may be
obtained from its Secretary-Treasurer, 1625 Eye Street, N.W., Washington, D.C. 20006. Prices may be
obtained from the secretary-treasurer.
Technical society and technical association specification standards are generally available for
reference from libraries. They are also distributed among technical groups and using Federal agencies.
3.1 General requirements. Since difficulty may be encountered in obtaining the specified
retention and penetration, it is the responsibility of the supplier to select piles, poles, and posts for treat-
ment that have sufficient sapwood thickness to permit obtaining the retention and penetration specified.
Suitable conditioning and, for some species, incising prior to treatment and the use of treating conditions
which do not damage the wood according to AWPA standards C1 and M3, are further responsibilities of
the supplier (see 3.4 and 3.5). Unless otherwise specified in the contract or purchase order (see 6.2), the
treatment of various products and species shall be in accordance with tables I, II and III and footnotes
thereto. Inspection of treated products shall be made in accordance with paragraphs 4.2 to 4.2.7 in-
clusive. Whenever differences exist between this specification and corresponding industry specifica-
tions, the requirements of this specification shall prevail.
3.2 Segregation of material for treatment. The material shall be separated or spaced so as to
insure contact of treating medium with all surfaces. Whenever the quantity of material ordered is suffi-
cient, items of different species, size, conditioning, and retention requirements shall be treated in
separate charges.
3.3 Empty-and full-cell processes. Empty-cell treatment shall be used with preservative oils and
oil-borne preservatives except when the retention specified is greater than can be obtained by an empty-
cell process. Water-borne preservatives shall be injected by the full-cell process whenever the product is
to be used in coastal waters or in foundations. A modified full-cell process, as described in AWPA
Standard C1, may be used for plywood and sawn material less than 5 inches in thickness and not in-


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