Translating Chinese Silane Spec Sheets to ASTM/EN — A Buyer's Reference
May 2026
TL;DR
Chinese silane TDS (Technical Data Sheet) columns use Chinese conventions, GB units, and parameter naming that differs from ASTM, EN, ISO, or BfR conventions familiar to Western buyers. This guide maps Chinese silane spec parameters to international standards, identifies common interpretation pitfalls, and shows how to verify spec accuracy via lab testing.
Common Chinese Silane TDS Layout
A typical Chinese silane TDS has these sections:
- 产品名称 / Product Name — Chinese chemical name + chemical abbreviation (e.g., "γ-氨丙基三乙氧基硅烷 / KH-550")
- CAS 号 / CAS Number — Chemical Abstracts Service number (e.g., 919-30-2)
- 分子式 / Molecular Formula — chemical formula (e.g., (C₂H₅O)₃SiCH₂CH₂CH₂NH₂)
- 物化指标 / Physical-Chemical Specifications — typical values
- 包装 / Packaging — drum/IBC sizes
- 储存 / Storage — conditions
- 应用 / Applications — recommended uses
The "physical-chemical specifications" section is where Chinese conventions diverge from Western standards.
Parameter Translations
Purity (纯度 / 含量)
| Chinese Term | Western Equivalent | Notes |
|---|---|---|
| 纯度 (主含量) | Active content (GC purity) | Usually GC-FID measurement |
| 含量 | Active content | Same as 纯度 |
| ≥98.5% | Active ≥98.5% | Typical for KH-550 |
| ≥99.0% | Active ≥99.0% | Premium grades |
The Chinese "含量" can mean either (a) GC-measured active silane content or (b) pure-by-difference (mass minus impurities). Verify which method the supplier uses; differences can be 1-3% on identical samples.
Hydrolyzable Chloride (可水解氯)
| Chinese Term | Western Equivalent | Notes |
|---|---|---|
| 可水解氯 (HCl) | Hydrolyzable chloride | Usually under 100 ppm acceptable; under 50 ppm preferred |
| ≤200 ppm | under 0.02% w/w | Loose spec |
| ≤50 ppm | under 0.005% w/w | Tight spec, premium grade |
Hydrolyzable chloride is critical for downstream cure systems — high chloride causes corrosion in electronics applications and side reactions in some thermosets.
Methanol Residual (甲醇残留)
For methoxy silanes (e.g., A-171, KH-560 methoxy version):
| Chinese Term | Western Equivalent | Notes |
|---|---|---|
| 甲醇含量 | Methanol residual | Result of partial hydrolysis |
| ≤0.5% | under 5,000 ppm | Loose spec |
| ≤0.1% | under 1,000 ppm | Tight spec, premium |
For ethoxy silanes (KH-550 ethoxy, KH-560 ethoxy version), the parameter is usually "乙醇残留" (ethanol residual).
Density (密度)
| Chinese Term | Unit | Western Convention |
|---|---|---|
| 密度 | g/mL @ 25 °C | g/mL or g/cm³ @ 25 °C |
| 25 °C 比重 | dimensionless | Specific gravity at 25 °C |
Refractive Index (折光率 / 折射率)
Standard at 25 °C, with d-line wavelength. Chinese TDS may list "折光率 nD20" (at 20 °C) — ensure temperature consistency when comparing.
Flash Point (闪点)
Closed-cup or open-cup measurement; typically the Chinese TDS lists "闭杯闪点" (closed-cup, more conservative) or "开杯闪点" (open-cup). Western SDS typically uses closed-cup.
Color (色度)
| Chinese | Western | Method |
|---|---|---|
| Pt-Co (APHA) ≤30 | APHA color ≤30 | Platinum-cobalt scale |
| 透明无色 | Clear, colorless | Visual |
| 微黄色 | Light yellow | Visual; suggests degradation |
Common Spec Sheet Interpretation Pitfalls
1. "Typical" vs "Maximum" specifications: Chinese TDS sometimes shows typical values without defining max/min ranges. Confirm whether the values are guaranteed or just typical.
2. Methanol residual vs methanol content: "甲醇残留" usually means residual from partial hydrolysis (low). "甲醇含量" can be interpreted as total methanol content (including bound and free methoxy). Significant difference!
3. GC-FID vs GC-TCD purity: Different detectors give different results. FID (flame ionization) typically reads 1-2% higher than TCD (thermal conductivity) for same sample. Specify the test method.
4. Active content excluding "physical impurities" vs "all impurities": Chinese TDS may exclude common solvent residues from purity calculation, inflating the apparent purity by 0.5-1.5%.
5. Storage requirement temperatures: "常温 (Normal temperature)" in Chinese TDS often means up to 35 °C. Western standard for "Normal temperature" is 20-25 °C only. Validate storage conditions for stability.
Verification: Lab Testing
For new suppliers, validate the spec sheet via independent lab testing:
| Parameter | Method | Lab Cost (USD) |
|---|---|---|
| GC purity | GC-FID with calibration standard | $200-500 |
| Hydrolyzable chloride | Argentometric titration after hydrolysis | $150-300 |
| Methanol/ethanol residual | GC headspace | $200-400 |
| Density | Density meter @ 25 °C | $50-100 |
| Refractive index | Abbe refractometer @ 20 °C | $50-100 |
| Color (APHA) | Pt-Co color measurement | $50-100 |
Total verification cost: $700-1,500 per silane sample. Worth it for new supplier qualification.
Where Chinese Spec Books Often Differ
- KH-550 (γ-aminopropyltriethoxysilane): Chinese spec ≥98.5%, Western (Dow Z-6020) ≥99.0%. The 0.5% difference matters in catalysis and curing applications.
- KH-560 (γ-glycidoxypropyltrimethoxysilane): Methoxy hydrolysis causes drift over storage; Chinese spec ≥97.0% on shelf vs ≥99.0% fresh from Dow Z-6040.
- Si-69 (TESPT): Chinese spec varies; tier-1 Chinese suppliers offer Western-equivalent quality, tier-2 may be 95-97% pure.
Related Reading
Qualify Chinese silicone supplier for the full procurement playbook. MSDS / SDS reading for compliance documentation. Silane coupling agent category for individual grade details.