ISO 6521-3-2019 PDF
Name in English:
St ISO 6521-3-2019
Name in Russian:
Ст ISO 6521-3-2019
Original standard ISO 6521-3-2019 in PDF full version. Additional info + preview on request
Full title and description
Lubricants, industrial oils and related products (Class L) — Family D (compressors) — Part 3: Specifications of categories DRA, DRB, DRC, DRD, DRE, DRF and DRG (lubricants for refrigerating compressors). The document specifies minimum requirements for mineral or synthetic based lubricants intended for use in refrigerating compressors.
Abstract
This international standard defines the minimum physical and performance requirements for lubricants used in all types of refrigerating compressors and is intended to be read in conjunction with ISO 6743-3.
General information
- Status: Published (international standard; confirmed at periodic review).
- Publication date: 1 October 2019.
- Publisher: International Organization for Standardization (ISO).
- ICS / categories: 75.100 — Lubricants, industrial oils and related products.
- Edition / version: Edition 1 (2019).
- Number of pages: 13–14 pages (count varies with language/print version).
Scope
This part of ISO 6521 specifies the minimum requirements for mineral- or synthetic-based lubricants, as delivered, intended for use in all types of refrigerating compressors. It covers specification of categories DRA through DRG and is complementary to the classification and test method references given in ISO 6743-3.
Key topics and requirements
- Definitions and designation of lubricant categories for refrigerating compressors (DRA, DRB, DRC, DRD, DRE, DRF, DRG).
- Minimum physical and chemical properties (viscosity grades, pour point, flash point, oxidation/thermal stability and compatibility criteria as applicable to refrigerating systems).
- Requirements for base oil type (mineral or synthetic) and typical performance attributes required for refrigerating compressor applications.
- Compatibility and serviceability notes — relationship to refrigerants and seals, and guidance to read alongside ISO 6743-3 for classification and test-method references.
- Test and conformity expectations referenced to established ISO test methods and family-level classifications.
Typical use and users
Used by lubricant manufacturers for product specification and labeling, compressor OEMs and component suppliers for specifying acceptable lubricants, maintenance and reliability engineers in refrigeration and HVAC industries, and standards bodies or procurement/specification writers preparing equipment purchase documents.
Related standards
Directly related to the ISO 6521 family and to ISO 6743-3 (classification of lubricants — Family D compressors). Other parts in the ISO 6521 series include ISO 6521-1:2019 and ISO/TS 6521-2:2021 which cover other compressor lubricant categories and applications.
Keywords
refrigerating compressors; compressor lubricants; industrial oils; lubricant specification; ISO 6521; ISO 6743-3; DRA DRB DRC DRD DRE DRF DRG; refrigerant compatibility; viscosity; oxidation stability.
FAQ
Q: What is this standard?
A: ISO 6521-3:2019 is an international standard that sets minimum specification requirements for lubricants intended for refrigerating compressors (categories DRA–DRG).
Q: What does it cover?
A: It covers classification of lubricant categories for refrigerating compressors and minimum physical and performance requirements (viscosity, stability, compatibility, etc.), and it is intended to be used with ISO 6743-3 for test-method and classification context.
Q: Who typically uses it?
A: Lubricant producers, compressor manufacturers (OEMs), maintenance/reliability engineers in refrigeration and HVAC, procurement/specification writers, and standards committees.
Q: Is it current or superseded?
A: ISO 6521-3:2019 was published on 1 October 2019 and remains the published edition; ISO standards are subject to periodic review (typically every five years) and the status is maintained on the ISO catalogue.
Q: Is it part of a series?
A: Yes — it is Part 3 of the ISO 6521 family (Family D — compressors). Other parts include ISO 6521-1:2019 and ISO/TS 6521-2:2021 which specify lubricant categories for different compressor types.
Q: What are the key keywords?
A: Refrigerating compressors; compressor lubricants; lubricant specification; industrial oils; ISO 6521; ISO 6743-3; DRA–DRG; viscosity; oxidation stability.