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: For timber with mixed grain orientation (tangential-radial), shrinkage values are provided for final moisture contents ranging from 5% to 37% . Reference Tables

: If the wood's moisture content is higher than the standard nominal moisture level, the actual dimensions must be larger than the nominal ones by the established shrinkage value. gost 67821 75

: Nominal dimensions are typically set for moisture levels of 15% or 20% . Because this is a technical legislative document, the

Because this is a technical legislative document, the full text—including the precise mathematical tables—is best viewed via official PDF repositories: : Rosstandart (Russian) Full Text (PDF) : Meganorm or Stroyinf Annotated Version : Docs.cntd.ru still active in many CIS countries

(officially Coniferous sawn timber. Shrinkage value ) is a Soviet-era state standard, still active in many CIS countries, that defines the shrinkage values for softwood lumber to ensure they meet nominal dimensions after drying.

The standard applies to softwood lumber (coniferous wood) produced via tangential, radial, or mixed sawing methods. It establishes mandatory shrinkage allowances for thickness and width to compensate for volume loss during the drying process.

Below is a summary of the core text and requirements based on official documentation from sources like Rosstandart and Docs.cntd.ru .