Overview
ISO 20437:2017 specifies requirements for natural rubber latex (NRL) cleanroom gloves designed for use in highly controlled cleanroom environments classified as ISO 4, ISO 5, and ISO 6. These gloves are critical for minimizing contamination in industries where pollution control is paramount-such as electronics, semiconductors, thin-film transistor (TFT) manufacturing, liquid crystal display (LCD) production, nanotechnology, and biomedical sectors.
The standard focuses on ensuring glove surfaces are free from contaminants such as submicron particles, ionic residues, total non-volatile residue (TNVR), and prohibited substances like silicone, amides, and dioctyl phthalate (DOP). By adhering to this specification, manufacturers and users can maintain the highest cleanroom integrity during product handling and processing.
Key Topics
Classification and Scope
- Specifies cleanroom gloves compliant with ISO Classes 4, 5, and 6.
- Applicable only to gloves made from natural rubber latex (NRL).
Contamination Control Parameters
Glove surfaces are controlled for:
- Particle count: Limits on submicron particles released by gloves, essential to prevent airborne contamination.
- Ionic content: Strict thresholds on ions such as fluoride, chloride, nitrate, sulfate, sodium, potassium, calcium, and magnesium to avoid chemical contamination.
- Total Non-Volatile Residue (TNVR): Measurement of residual organic and inorganic substances on glove surfaces.
- Silicone, Amide, DOP content: These substances must be absent to protect sensitive manufacturing processes.
Sampling and Testing
- Sampling requires three gloves per batch per test parameter, ensuring statistically relevant data.
- Test methods are aligned with IEST RP-CC005.4 protocols covering particle counting, ionic content analysis, TNVR, and detection of silicone, amide, and DOP.
- Particle counts are segmented by size ranges from 0.5 to >20 micrometers for detailed contamination assessment.
Processing and Packaging
- Gloves undergo submicron laundry processing using reverse osmosis deionized (RO-DI) water with resistivity between 13 and 18 megaohms to remove contaminants effectively.
- Cleaned gloves are dried in specialized low-particle dryers within certified cleanroom environments with laminar airflow.
- Packaging utilizes non-particulating materials with careful marking instructions to prevent exposure to heat or light, reducing further particle generation.
Applications
ISO 20437:2017 certified natural rubber latex cleanroom gloves are widely used where stringent contamination control is essential, including:
- Semiconductor fabrication: Protecting ultra-pure wafers and chips from particulate and chemical contaminants.
- Electronic and disk drive manufacturing: Avoiding contamination that can damage sensitive electronic components.
- Display technology industries: TFT and LCD production requiring ultra-clean environments for manufacturing thin films and displays.
- Nanotechnology and biomedical fields: Ensuring sterile, particle-free handling environments vital for high-precision and clinical applications.
Using gloves conforming to ISO 20437 enhances product quality, reduces defect rates, and ensures compliance with cleanroom regulations, thereby safeguarding critical manufacturing processes.
Related Standards
ISO 20437 references and aligns with several key standards for comprehensive cleanroom and glove quality management:
- IEST RP-CC005.4: Standard test methods for gloves in controlled environments, detailing particle count and chemical residue evaluation.
- ISO 14644-1 & ISO 14644-6: Classification and vocabulary standards for cleanrooms and associated controlled environments, providing the framework for environmental cleanliness levels.
- ISO 11193-1: Specification for single-use medical examination gloves, complementing cleanroom glove standards in hygiene-critical fields.
- ISO 2859-1: Sampling procedures that guide statistical acceptance in manufacturing quality control.
Adhering to ISO 20437 along with these standards ensures an integrated approach to contamination control, glove performance, and cleanroom compatibility.
By implementing ISO 20437:2017 specifications, manufacturers and users of natural rubber latex cleanroom gloves uphold the stringent quality and cleanliness required in critical cleanroom operations, thereby optimizing product integrity and process safety.