GOST 34755-2021 PDF

Full title and description

GOST 34755-2021 — "Synthetic rubbers. Determination of total and water soluble ash" (Russian: ГОСТ 34755-2021 — Каучуки синтетические. Определение общей и водорастворимой золы). The standard specifies laboratory procedures for measuring total ash and the fraction of ash that is water‑soluble in synthetic rubber samples.

Abstract

This GOST defines sample preparation, ashing and washing procedures, required apparatus (muffle furnace, desiccator, drying oven, precision balances, filter media), calculation and reporting rules, and repeatability/rounding requirements for results. It is intended to provide a reproducible test method to determine total ash and water‑soluble ash content in synthetic rubbers used in quality control and specification compliance.

General information

• Status: Active / in force.
• Publication date: Introduced (effective) 01 July 2022; approved by Rosstandart 08 November 2021.
• Publisher: Adopted as an interstate GOST standard (approved by the Russian Federal Agency on Technical Regulating and Metrology — Rosstandart).
• ICS / categories: Rubber and rubber products; OKS / OCS classification shown as 83.060 (rubber technology and production).
• Edition / version: Original issue — 2021 (designated GOST 34755-2021, enacted 2022).
• Number of pages: 8 pages (concise test method document).

Scope

The standard applies to synthetic rubbers and specifies methods for determination of (a) total ash obtained by ignition of a dried rubber sample and (b) the portion of that ash soluble in water after prescribed washing and drying. It is applicable for laboratory testing, quality control and conformity assessment where ash content is a relevant product characteristic.

Key topics and requirements

• Sampling and sample preparation — drying and sheeting (methods A and B described) to remove volatile matter before testing.
• Ashing procedure — ignition of weighed dried sample in a muffle furnace at 550 ± 25 °C to constant weight to obtain total ash.
• Water‑soluble ash — washing the ash (typically three washes with measured portions of water), drying and re‑ignition to determine the water‑insoluble residue; calculation of soluble fraction by difference.
• Apparatus and materials — muffle furnace, drying oven/thermostat (100 ± 5 °C), desiccator, precision laboratory balances (high accuracy), ashless filter paper and specified reagents/conditioning agents (e.g., dried calcium chloride or silica gel for desiccator).
• Sample sizes and accuracy — typical sample masses and weighing precision (e.g., 3–5 g for ashing), rounding rules and acceptance of the mean of two determinations when repeatability limits are met.
• Reporting — results expressed as mass fraction (percent), with stated rounding and repeatability criteria (example: allowable divergence between repeat determinations given in the standard).

Typical use and users

Used by laboratory technicians, quality control and R&D personnel in rubber and elastomer manufacturing, third‑party testing laboratories, materials inspectors, and standards/compliance specialists who require validated test methods for ash content in synthetic rubbers.

Related standards

The standard references related normative documents for sampling and test materials (for example GOST ISO 1795 for sampling, GOST 12026 for ashless filter paper, and other national/intrastate test method standards cited in the normative text). It is part of the GOST family of standards for rubber and rubber‑technical products and complements other property and test‑method standards for elastomers.

Keywords

GOST 34755-2021; synthetic rubber; ash content; water‑soluble ash; ashing; muffle furnace; test method; quality control; rubber testing.

FAQ

Q: What is this standard?

A: GOST 34755-2021 is an interstate (GOST) test method standard titled "Synthetic rubbers. Determination of total and water soluble ash" that specifies laboratory procedures for measuring ash content in synthetic rubbers.

Q: What does it cover?

A: It covers sample preparation, ashing at specified temperature, washing of ash to determine the water‑soluble fraction, required apparatus, calculation rules, repeatability and reporting procedures for test results.

Q: Who typically uses it?

A: Manufacturers of synthetic rubbers, QC and R&D labs, independent testing laboratories and conformity assessment bodies that perform material characterization and acceptance testing for rubber products.

Q: Is it current or superseded?

A: It is current (in force); the standard was approved by Rosstandart on 8 November 2021 and put into effect 1 July 2022. Consult the national standards registry or Rosstandart for any later amendments or revisions.

Q: Is it part of a series?

A: It is part of the GOST series of standards covering rubber and rubber‑technical products and test methods; related GOSTs address other physical, chemical and performance properties of elastomers.

Q: What are the key keywords?

A: Synthetic rubber, ash content, total ash, water‑soluble ash, ashing, muffle furnace, test method, GOST 34755-2021.