CCT

Our composite score (0–10). Blends effectiveness, health impact, and environmental impact against a published rubric. Higher is better.

Health

Health-only sub-score (0–10), translated from the product's Safety Data Sheet and ingredient chemistry. Green ≥ 7, amber 4–6.9, red < 4.

Env

Environmental sub-score (0–10): biodegradability, aquatic toxicity, VOCs, and packaging. Color tracks the score — red lowest, emerald highest.

Flags

Quick badges:

• SDS — Safety Data Sheet on file.NO SDS means the manufacturer hasn't published one (we penalize the health score for this).
• CARB— meets the California Air Resources Board's stricter VOC limits.
• Bio— biodegradable per the manufacturer's claim.
• P65 — carries a California Prop 65 cancer or reproductive-harm warning.

3 products · ranked best-first

Healthier picks hides products with a Prop 65 warning or PFAS ingredients.

1. 01

   

   Bilt Hamber

   Hydrate 80 Rust Killer

   🏆#1 · Rust ConverterSDS

   7.6*

   CCT
   Health8.5Env6.3

   See it on Amazon →
2. 02

   

   Corroseal

   Water-Based Rust Converter Metal Primer

   SDS

   6.8*

   CCT
   Health5.0Env
3. 03

   

   Rust Kutter

   Rust Converter

   SDS

   6.5*

   CCT
   Health4.0Env5.9

Product	Category	CCT ↓	Health	Env	Flags	Buy
Bilt Hamber Hydrate 80 Rust Killer 🏆#1 · Rust Converter	Rust Converter