Understanding the Silicone Products Standardization System: A Comprehensive Compliance Guide – From International to Industry Standards

  As a high-performance elastomer material, silicone is widely used in core industries such as healthcare, food, electronics, and automotive; its quality and safety directly impact human health and product reliability. Globally, an international standard system centered on ISO and ASTM, a Chinese national standard system dominated by GB/HG, and industry-specific regulations tailored to specific application scenarios have been established. This article systematically outlines the compliance requirements for silicone products across four major dimensions-international standards, national standards, industry standards, and environmental and safety regulations-helping practitioners build a comprehensive standard-awareness framework and mitigate compliance risks for both export and domestic sales. I. International Standards: The Technical Passport for Global Trade

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The international standards for silicone products are centered around two major frameworks – ISO (International Organization for Standardization) and ASTM (American Society for Testing and Materials) – and serve as the fundamental threshold for products seeking entry into global markets.

① ISO System: A baseline for healthcare and general performance

The ISO 10993 series serves as the "gold standard" for the biocompatibility assessment of medical devices. Among these, ISO 10993-1 acts as the general guideline, classifying testing levels based on the type of human exposure (surface contact, external application, implantation) and the duration of exposure (e.g., limited to ≤ 24 h or prolonged> 30 days, etc.). Silicone-based products must undergo fundamental testing, including cytotoxicity testing (ISO 10993-5) and sensitization testing (ISO 10993-10). For products such as medical silicone catheters and respiratory masks, compliance with this standard is a mandatory requirement for entering the European and North American markets.

Furthermore, ISO 8009 specifies the requirements for mechanical properties, durability, and aging tests applicable to reusable natural and synthetic silicone rubber contraceptive devices; it serves as a specialized standard for silicone-based reproductive health products.

②ASTM System: The Classification Language for Industrial Rubber

ASTM D2000 is a classification standard for rubber materials used in the automotive and industrial sectors, which precisely defines material properties using an alphanumeric code system. For example, in the standard code "M 70 GE 508 A14 B37":

M denotes the use of metric units (MPa, °C).

The "A" suffix denotes heat resistance and aging performance.

The "B" suffix denotes the compressed permanent deformation performance.

The "C" suffix denotes resistance to ozone and weathering aging.

This "Standard Language" enables global buyers and suppliers to precisely match material specifications without lengthy descriptions.

③ EU market mandatory entry barriers

Silicone products exported to the European Union must comply with two separate regulatory requirements:

REACH Regulation: Requires the implementation of full life-cycle management for chemical substances; substances of Very High Concern (SVHC) are subject to a notification obligation.

RoHS Directive: Limits the content of harmful substances such as lead, cadmium, mercury, and hexavalent chromium; silicone components used in electronic and electrical products must comply with the requirements.

HF: In halogen-free materials, the bromine and chlorine content shall each be less than 900 ppm, and the sum of the bromine and chlorine contents shall be less than 1500 ppm; such materials are classified as halogen-free. The term "halogen-free" does not imply the complete absence of halogens, but rather that the halogen content is below the aforementioned specific limits.

For example, silicone tableware for infants and young children that exceeds mercury content limits will be directly seized and returned by EU customs; similarly, special silicone products that are accused of containing excessive amounts of additives or showing elevated chlorine levels during post-molding testing may face substantial fines.

II. National Standards: The Foundation of Quality for Made in China Products

China's silicone product standard system is primarily composed of GB (National Standards) and HG/T (Chemical Industry Standards), covering multiple dimensions including basic performance characteristics, food contact, and medical applications.

Basic Performance General Specification GB/T 528-2009 – Key Standard Points (Applicable to Silicone Rubber); Full Title: "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber"; International Equivalent: Equivalently adopted from ISO 37:2005; Effective Date: December 1, 2009; Status: In force (Note: An updated version GB/T 528-2019 has been issued, corresponding to ISO 37:2017).

GB/T 33402-2016 "Silicone rubber compound – General use" (General-purpose product standard)

This is the fundamental standard for silicone products, defining core physical parameters such as tensile strength, tear strength, hardness tolerance, and temperature resistance range; it serves as the minimum requirement for all types of silicone products and is used for the quality acceptance of silicone rubber compound materials or finished products.

Silicone rubber product standard system overview:

Food Contact Materials Safety Red Line

GB 4806.11-2023 "National Food Safety Standard – Rubber Materials and Products for Use in Contact with Food" is a mandatory standard for rubber materials and products intended for use in contact with food (Note: Silicone rubber will be regulated by the separate standard GB 4806.16-2025, which will come into force as a mandatory standard in September 2026). This standard requires that products undergo a series of tests-including total migration test, heavy metal migration test, and potassium permanganate consumption test-to ensure that no toxic substances are released when in contact with food.

Special requirements for pacifiers

For infant and toddler pacifiers, the GB 4806.2-2015 "National Food Safety Standard – Pacifiers" specifies more stringent limits for volatile substances – specifically, the content of volatile substances in silicone pacifiers shall not exceed 0.5% (measured after 4 hours at a constant temperature of 200°C). Although this is a dedicated standard for pacifiers, many high-end food-grade silicone manufacturers voluntarily adopt this limit as a basis for more rigorous internal quality control, applicable to products such as silicone spoons for infants and toddlers and food preparation molds.

Strict requirements for medical-grade silicone

The medical sector imposes more stringent standards. The specialized standard for medical silicone rubber tubing is YY/T 0031-2008 "Silicone Rubber Tubing and Elastomeric Components for Infusion and Blood Transfusion," which requires that the product maintain its elastic properties even after being sterilized using high-temperature steam at 121°C.

Biocompatibility

All medical silicone products must comply with the GB/T 16886 (ISO 10993) series of standards; their cytotoxicity must be classified as Grade 0 (non-toxic), and they must pass a comprehensive range of tests, including sensitization and intradermal irritation tests.

The HG/T 2765 series of standards specifies the classification criteria for inorganic silica gel used in adsorption applications:

Type A microporous silica gel: specific surface area ≥ 700 m²/g; suitable for precision drying applications.

Type C coarse-pore silica gel: pore size controlled between 8–12 nm, suitable for dehumidification in high-humidity environments.

III. Industry Standards: Professional Guidelines for Specific Segments

The varying emphasis placed on silicone performance across different application scenarios has given rise to specialized regulatory frameworks tailored to each vertical industry.

Healthcare and Aerospace

The aerospace industry complies with HB 5250-2017 "Specifications for Silicone Rubber Insulating Materials for Aerospace Applications," which requires that silicone rubber maintain stable insulation resistance within the extreme temperature range of –65°C to 200°C, while also being resistant to erosion by aviation fuel and hydraulic oil.

automotive industry

The automotive industry adheres to the SAE J200 standard (equivalent to ASTM D2000); silicone materials used for engine compartment sealing must pass a thermal oil immersion test lasting 300 hours or more, while also meeting the broad temperature range requirements – no brittleness at-40°C and no softening at 200°C. Silicone materials used for new energy vehicle battery pack sealing must additionally comply with the UL94 V-0 flame retardancy rating and hold a UL Yellow Card.

Electronic manufacturing

Electronic silicone buttons and seals must comply with the UL 94 V-0 flame retardancy rating – during the vertical burning test, the single residual flame duration shall be ≤10 seconds and the total residual flame duration shall be ≤50 seconds, with no dripping that ignites cotton material. The corresponding Oxygen Index (LOI) shall typically be ≥28%; for high-end flame-retardant silicone materials, the LOI may exceed 35%.

Maternal and infant contact with food

Food-grade silicone baby bottles and tableware intended for export to the United States must be certified under FDA 21 CFR 177.2600 to ensure that no harmful substances-such as plasticizers or bisphenol A-have migrated into the product. For the European market, additional compliance with the EN 14350 standard for children's drinking containers is required.

Special standards for extreme scenarios

Taking industrial silicone tubing as an example, the wall thickness tolerance for precision-grade products must be maintained within ±0.1 mm, and the tensile strength must be ≥7.0 MPa; for electrical-grade products, a breakdown voltage test at 20 kV/mm must be passed. Silicone seals used in nuclear power plants must also comply with the standard EJ/T 20009-2016 "Test Methods for Irradiation Aging of Nuclear-Grade Silicone Rubber Products" to verify their performance degradation rate under long-term irradiation conditions.

IV. Environmental Protection and Safety: Hard Constraints for Sustainable Development

Amid the global "dual carbon" goals and the growing trend toward green manufacturing, environmental standards for silicone products are continuously being elevated, making them a new compliance dimension that businesses must prioritize.

① Enhanced regulatory framework for cyclic siloxanes

Article 70 of Annex XVII to the EU REACH Regulation has undergone significant revision: as of June 6, 2026, three cyclic siloxanes – octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5), and dodecamethylcyclohexasiloxane (D6) – shall not be placed on the market if their concentration in the product reaches or exceeds 0.1% (1000 ppm). This revision directly impacts multiple segments of the industrial chain, including silicone raw materials, cosmetics, and personal care products, and will compel silicone manufacturers to optimize their polymerization processes and reduce residual cyclic siloxane content.

② Intensified domestic VOCs treatment efforts

China's "Comprehensive Management Plan for Volatile Organic Compounds in Key Industries" explicitly requires silicone manufacturing enterprises to install online VOCs monitoring systems, with the exhaust gas emission concentration not exceeding 50 mg/m³. The collection and treatment of volatile emissions generated during the production of liquid silicone and rubber compounds have become a key focus of environmental protection inspections.

③ Refined health and safety requirements

ISO 18562-4:2023 – "Medical devices – Biocompatibility of respiratory pathways" now includes a requirement for testing nanoparticle release levels to prevent the generation of inhalable particles during the use of silicone respiratory masks and anesthesia tubing. For products that come into contact with the skin, such as silicone wristbands and wearable device straps, EN 1811:2022 specifies that nickel release levels shall not exceed 0.5 μg/cm²/week, thereby preventing skin allergies resulting from prolonged skin contact.

V. FAQ – Frequently Asked Questions

Q1: What is the difference between food-grade silicone and medical-grade silicone?

A: The testing criteria for these two types of silicone differ. Food-grade silicone focuses on substance migration during food contact (total migration amount, heavy metals, VOCs, etc.) and is governed by standards such as GB 4806.11 or FDA regulations; medical-grade silicone emphasizes biocompatibility (cytotoxicity, sensitization, hemolysis, etc.) and complies with ISO 10993 or the GB/T 16886 series. Medical-grade standards are generally more stringent, but they cannot be directly equated with food-grade standards, nor vice versa.

Q2: Do silicone products exported to the EU require REACH certification?

A: REACH is not a "certification" but rather a regulatory compliance obligation. Ordinary silicone products must be ensured to be free from SVHC substances or to have SVHC content below 0.1%; starting from June 2026, they must also comply with the D4/D5/D6 limit requirement (limit value ≤ 0.1%). Silicone components used in electronic and electrical products must additionally comply with the RoHS Directive.

Q3: What is the relationship between UL94 V-0 and the Oxygen Index?

A: UL94 V-0 is a rating system for vertical combustion tests, focusing on the self-extinguishing time after removal of the ignition source and the behavior of dripping materials; the Oxygen Index (LOI) represents the minimum oxygen concentration required to sustain combustion. These two parameters are positively correlated, but they cannot be directly converted into one another -– silica gel with an LOI ≥ 28% has a chance of achieving the V-0 rating; however, this depends on factors such as material thickness and the flame retardant system used.

Q4: Are there unified VOC limit values for domestic silicone products?

A: Currently, among the national standards, only GB 4806.2 "Nursing pillows" explicitly requires that the silicone VOC content be ≤0.5%; for other silicone products intended for food contact, there are no mandatory VOC limit requirements at present. However, the industry widely adopts 0.5% as a general reference standard for food-grade silicone materials; products exported to the European Union must also comply with the REACH regulations governing specific chemical groups, such as D4/D5.

Standards are not constraints, but rather a "passport" for silicone products to enter high-end markets. From the international ISO/ASTM framework to domestic GB/HG specifications, and from the fundamental safety requirements for the food and healthcare sectors to the continuous evolution of environmental protection regulations – silicone manufacturers can only achieve steady and sustainable growth in the global marketplace by establishing a comprehensive standardization awareness framework.

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