ASTM D632 / AASHTO M-143 — US/Canada Deicing Salt Standard
ASTM D632 + AASHTO M-143 US/Canada deicing salt standard. Grade 1 (4.75-9.5 mm coarse) + Grade 2 (2.0-4.75 mm fine). Egyptian sea + rock salt compliant. State DOT specs.
ASTM D632 — Standard Specification for Sodium Chloride
ASTM D632/D632M: "Standard Specification for Sodium Chloride" is the US reference standard for industrial-grade sodium chloride. Used for de-icing salt procurement by US state DOTs (in conjunction with AASHTO M-143), water-treatment, and select industrial applications.
Defines:
- Chemical composition limits for NaCl, insolubles, moisture, anti-caking
- Two grain-size grades (Grade 1 Coarse + Grade 2 Fine)
- Quality acceptance test methods
- Optional supplementary requirements (heavy metals, anti-caking, additives)
Grade 1 — Coarse
- Particle size range: 4.75-9.5 mm (US sieve #4 to ⅜")
- Use: traditional spreader bar trucks, low-speed traffic, high application rates, pre-treatment salt domes
- Application rate: 20-40 g/m² typical
Grade 2 — Fine
- Particle size range: 2.0-4.75 mm (#10 to #4)
- Use: pre-wetting brine prep, high-speed roads, faster melt response
- Application rate: 15-30 g/m² typical
| Property | Specification |
|---|---|
| NaCl (sodium chloride) | ≥ 95% (dry basis) |
| Insoluble matter | ≤ 5.0% |
| Moisture (loss on drying at 110°C) | ≤ 3.0% |
| Sodium ferrocyanide (E535) anti-caking | Optional, ≤ 200 ppm |
Some US state DOTs add tighter requirements via state specs:
Egypt Globe Group supplies ASTM D632-compliant rock salt:
Typical Egyptian assay:
- NaCl: 96.5-97.5% (rock); 96.5-97.0% (sea) — exceeds 95% spec
- Insolubles: 1.0-2.0%
- Moisture: 1.0-2.0% (kiln-dried)
- Particle size: ≥90% within target window per Grade
ASTM D632 is the chemistry + sieve specification; AASHTO M-143 is the product standard that state DOTs reference for procurement. Most state DOT salt contracts cite both:
- AASHTO M-143 (umbrella standard)
- ASTM D632 (chemistry + sieve definitions)
- ASTM C114 (chemical analysis test methods)
Typical state DOT contract cycle:
- RFP issued May-July for upcoming winter
- Vendor responds with NaCl spec sheet, gradation report, AASHTO/ASTM compliance, plant inspection records
- Award Aug-Sept
- Pre-positioning to state salt domes Sept-Nov
- Operational use Nov-Apr (varies by state)
- Mill Test Certificate per ASTM C114 chemical analysis
- Gradation report per ASTM E11 sieve analysis
- AASHTO M-143 compliance letter
- ASTM D632 conformance statement
- SDS per OSHA HazCom
- Bill of Lading + Certificate of Origin + Commercial Invoice
- Optional third-party TÜV Austria / SGS / Intertek inspection report
- AASHTO M-85 acceptance for federal highway projects
| Standard | Region | Min NaCl | Particle |
|---|---|---|---|
| ASTM D632 Grade 1 | USA | 95% | Coarse 4.75-9.5 mm |
| ASTM D632 Grade 2 | USA | 95% | Fine 2.0-4.75 mm |
| AASHTO M-143 | US Federal/State DOT | 96.5% | Adopts ASTM D632 + tighter NaCl |
| EN 16811-1 Grade A | EU | 96% | 0/2 / 0/4 / 0/6.3 |
| EN 16811-1 Grade B | EU | 95% | 2/8 |
| BS 3247:2011 | UK | 95% | 1-6 mm typical |
| CGSB Grade 3 | Canada | 95% | Variable |
| GOST 13830 Grade I | CIS | 97% | 0.5-5 mm |
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