GOST 9105-74 PDF

Full title and description

GOST 9105-74 — "Целлюлоза. Метод определения средней степени полимеризации" (English: The determination method of polymerisation average degree). The standard specifies a laboratory method for determining the average degree of polymerization (DP) of cellulose by viscometric measurement of dilute cuprammonium (copper‑ammonia) solutions of cellulose and calculation of DP from intrinsic viscosity.

Abstract

GOST 9105-74 defines sample preparation, solvent and solution preparation (cuprammonium type), viscosity measurement conditions and the calculation procedure for obtaining the average (viscometric) degree of polymerization of cellulose samples. It is intended for use with commercial and laboratory cellulose/pulp samples to assess polymer chain length as part of quality control and research.

General information

• Status: Active / in force (document listed as действующий in Russian standards databases; text contains integrated amendments).
• Publication date: Introduced 1 July 1975 (GOST 9105-74 designation year 1974, entry into force 01.07.1975).
• Publisher: State Committee for Standards (Gosstandart) of the USSR — originally issued by the intergovernmental/state standards system; currently tracked in Russian standards repositories (Rosstandart / national libraries).
• ICS / categories: National classification OKC (ОКС) 85.040 — cellulose / pulp & paper technology; classified under pulp/paper technical group for cellulose analysis and testing.
• Edition / version: GOST 9105-74 (with amendments integrated: Amendment No.1 — 1981; No.2 — 1986; No.3 — 1992 / integrated corrections noted in databases).
• Number of pages: 7 pages (typical published text length reported by standards catalogues).

Scope

The standard applies to cellulose (pulp) and establishes a viscometric method for determining the average degree of polymerization. The method is based on measuring the viscosity of dilute cuprammonium (copper–ammonia) solutions of cellulose under specified temperature and concentration conditions, calculating intrinsic viscosity and converting that value to an average DP using the prescribed relation. It is intended for laboratory testing of raw cellulose, pulps and related materials where polymer chain length (DP) is a relevant quality parameter.

Key topics and requirements

• Definitions: degree of polymerization (DP), intrinsic viscosity, limiting viscosity number and their relation to DP.
• Sample preparation: drying, conditioning and mass/solids determination before dissolution.
• Solvent and solution preparation: use of cuprammonium (copper‑ammonia) solvent type and preparation of dilute solutions within specified concentration ranges.
• Viscosity measurement: required viscometers, temperature control, timing and repeat measurements to ensure reproducibility.
• Calculations: conversion of measured viscosity to intrinsic viscosity and then to average DP using the standard’s prescribed formula or constants.
• Limits and applicability: notes on sample types where the method is valid and cautions for chemically modified or heavily filled/impregnated samples.
• Traceability and reporting: required reporting items (sample ID, solvent, temperature, raw data, calculated DP) and references to related normative documents.

Typical use and users

Used by pulp and paper mills, laboratory and quality‑control laboratories, material testing institutes, research organizations and producers of cellulose derivatives who need to evaluate polymer chain length (DP) for process control, specification compliance and research. Also used by standards and conformity bodies when comparing methods or verifying product characteristics.

Related standards

GOST 9105-74 is linked with other pulp and paper test standards and normative references. It replaced the earlier GOST 9105-59 and is commonly used alongside methods for related properties (for example, methods for copper number, viscosity of other solvent systems, and general pulp testing standards). Russian catalogues list normative cross‑references included in the standard text.

Keywords

cellulose; pulp; degree of polymerization; DP; intrinsic viscosity; viscometry; cuprammonium; cuprammonium solution; polymerisation average degree; GOST 9105-74; pulp testing.

FAQ

Q: What is this standard?

A: GOST 9105-74 is a Soviet / Russian state standard entitled "Cellulose. Method for determination of the average degree of polymerization" that prescribes a viscometric laboratory procedure to determine the average DP of cellulose samples.

Q: What does it cover?

A: It covers sample preparation, solvent and solution preparation (cuprammonium type), viscosity measurement conditions, calculation of intrinsic viscosity and conversion to average degree of polymerization, and reporting requirements for the test.

Q: Who typically uses it?

A: Pulp and paper producers, QC/analytical laboratories, research institutes working on cellulose chemistry, and standards/testing bodies that perform or reference cellulose DP determinations.

Q: Is it current or superseded?

A: According to Russian standards catalogues and repositories the 1974 designation (GOST 9105-74) was introduced 1 July 1975, replaced an earlier 1959 edition (GOST 9105-59) and has had amendments integrated (1981, 1986, 1992). Databases list it as действующий (in force) in national repositories, but users should confirm the legal/current status with the national standards authority (Rosstandart) or an up‑to‑date official catalogue before relying on it for regulatory purposes.

Q: Is it part of a series?

A: It belongs to the set of pulp and paper test methods and is associated with other GOSTs for cellulose and paper testing (for example, methods for copper number and other pulp characteristics). The standard itself superseded an earlier edition and includes references to related normative documents.

Q: What are the key keywords?

A: Cellulose; degree of polymerization; DP; intrinsic viscosity; cuprammonium; viscometry; pulp testing; GOST 9105-74.