⚗️ GHS Mixture Hazard Classification Calculator

A Streamlit-based calculator that classifies chemical mixtures using official GHS cut-off concentrations, producing a hazard profile based on ingredient hazard data.

🔍 What It Does

Enter a list of chemical ingredients and their contributions (by percentage or moles), and this app automatically:

• Applies GHS classification rules for health hazards
• Calculates applicable hazard classes such as:
  • Acute Toxicity
  • Skin Corrosion/Irritation
  • Carcinogenicity
  • And more
• Outputs a complete hazard profile, including:
  • ✅ Hazard class names
  • ✅ GHS pictograms
  • ✅ Signal words (e.g., Danger, Warning)
  • ✅ H-statements (e.g., H301: Toxic if swallowed)
• Allows printing to PDF for documentation or SDS use

💻 Built With

• Python
• Streamlit (web app framework)

📦 Features

• Mass or concentration and molar mass based input calculated automatically to w/w%
• Fully compliant with GHS health hazard thresholds
• Takes most careful approach, always choosing lowest possible cut-off concentration limit
• Automatically composes hazard pictograms and signal words
• Clean, printable summary page
• No internet or API dependency — runs entirely locally
• About page detailing calculations

🧪 Use Cases

• SDS authoring and compliance checks
• Laboratory safety and chemical mixture assessments
• Regulatory prep for REACH, CLP, OSHA HazCom
• Teaching and training in chemical safety

Note: This calculator applies only the GHS cut-off concentration thresholds to classify mixture hazards.
It does not incorporate experimental toxicity data or in-depth risk assessment.
Use this tool as a guidance aid and not as definitive evidence for regulatory or safety decisions.
Always consult qualified safety professionals and official testing results when necessary.

🚀 Getting Started

Clone the repository:

git clone https://github.com/yourusername/ghs-mixture-calculator.git
cd ghs-mixture-calculator
# Set up virtual environment
python3 -m venv venv
source venv/bin/activate
# Install dependencies
pip install -r requirements.txt
# Run Streamlit App
streamlit run App.py

🔗 Integration with On-Site Registry Checks

This calculator is designed to be easily integrated with on-site chemical registry systems or compliance workflows.

While proprietary registry documents cannot be shared publicly, the app's modular architecture allows seamless extension or API hooking to:

• Automatically fetch ingredient details from internal chemical databases
• Perform batch hazard classification against local chemical inventories
• Streamline SDS creation and regulatory audits on-site

To facilitate this, example integration workflows and scripts can be provided privately upon request to henry@teahan.dk.

⚠️ Disclaimer

This calculator performs hazard classification exclusively using GHS cut-off concentration thresholds as defined by international regulations.

It does not use empirical toxicity testing or replace comprehensive chemical risk assessments.

The results are intended as a guidance tool only. For formal safety evaluations or legal compliance, please refer to certified testing data and consult with chemical safety experts.