Chemistry + Environmental Science
Make bioplastic from milk or starch
Make casein and starch plastics at home and test their strength and how they break down.
- DifficultyEasy
- Estimated time1–2 weeks
- BudgetUnder ₹250
- ClassClass 7–11
- TeamSolo or up to 3
- You needHousehold materials
Prerequisites: None beyond your class work
Original · by TechnifyedExperimentScience Fair ProjectBeginner friendlyLow costWell documentedTwo subjects
Overview
Make casein and starch plastics at home and test their strength and how they break down.
Why build this?
You make a real alternative to plastic and test honestly whether it is strong enough to be useful.
What you will learn
- How natural polymers form a plastic
- What a plasticiser does
- How to test strength and breakdown
Skills you will use
Safety
- Hot surfaces and liquids can burn. Use tongs or oven gloves and let things cool before touching them.
Materials and tools
- Milk and vinegar
- Cornflour, glycerine and water
- Pan and stove
- Strainer
- Moulds
- Small weights
Step-by-step roadmap
Start
You will finish with: two bioplastic samples, strength results and photos of how each changed in soil.
- 1
Prerequisites
Nothing special to know first. Then collect the 6 items in the materials list.
- 2
Learn
- How natural polymers form a plastic
- What a plasticiser does
- How to test strength and breakdown
- 3
Plan
Write your question, your hypothesis and the one thing you will change. Draw the table you will fill in before you start.
- 4
Build
- Warm a cup of milk, stir in vinegar and strain the curds; press them into a mould.
- Heat cornflour, water, glycerine and vinegar until it turns clear and thick; spread it thin.
- Dry both for two to three days.
- Test how much weight a strip of each holds.
- Bury a piece of each and a piece of polythene in soil; check after two weeks.
- 5
Test
Repeat every reading at least three times and check the result against what the science predicts.
- 6
Document
Record every reading with its unit, photograph the setup and draw a graph of the result. Report structure
- 7
Present
Explain the question, the method and the graph in two minutes; keep the setup ready to demonstrate. Presentation structure · Viva questions
- 8
Publish
Share the report and photos with your class, a science fair or your school magazine.
Expected outcome
Two bioplastic samples, strength results and photos of how each changed in soil.
Other versions of this project
Beginner version
Make the milk plastic only and mould a small object.
Advanced version
Vary the glycerine amount and plot flexibility against glycerine.
Make this project better
- BasicMake the milk plastic only and mould a small object.
- This projectMake bioplastic from milk or starch
- AdvancedVary the glycerine amount and plot flexibility against glycerine.
Science fair mode
Text marked "You write this" is a prompt for your own work; everything else is specific to this project.
- Problem
- You write thisWrite your question as: How does [what you change] affect [what you measure]?
- Hypothesis
- You write thisWrite it as: If [I change this], then [this will happen], because [reason].
- Variables
- You write thisName the one thing you change (independent), the thing you measure (dependent) and what you keep the same (controlled).
Materials and procedure are in Materials and the Roadmap.
Observation table
You write thisDraw a table with one column for what you change, one for each repeat reading and one for the average.
- Graph
- You write thisPlot what you changed along the bottom and what you measured up the side; use a bar chart for categories and a line graph for numbers.
- Results
- You write thisState what the graph shows in one or two sentences, with numbers.
- Conclusion
- You write thisSay whether the result supports your hypothesis and why you think so.
Display board
- Title and your name
- Question
- Hypothesis
- Materials
- Procedure (with photos)
- Data table and graph
- Conclusion
- What you would do next
Questions judges ask
- What is casein?
- What does glycerine do?
- Is your bioplastic a replacement for polythene?
- What would you change if you did this again?
- What was your biggest source of error, and how did you reduce it?
- Where is this idea used in real life?
Working as a team
Solo or up to 3. Suggested roles:
Report and presentation
Report structure
- Title and question
- Background: the science behind it
- Hypothesis
- Materials
- Method (steps, with a diagram or photo)
- Observations (table)
- Results (graph and calculation)
- Sources of error
- Conclusion
- What you would do next
- References
Presentation structure
- The question
- Why it matters
- The idea behind it
- Setup (photo)
- Method in three steps
- Results (one clear graph)
- What the result means
- Errors and limits
- Conclusion and next step
Viva questions
Try answering before you open each one.
What is casein?
The main protein in milk, which clumps when acid is added.
What does glycerine do?
It acts as a plasticiser, making the starch film flexible.
Is your bioplastic a replacement for polythene?
Not yet; it is weaker and is damaged by water.
Resources
Polymers: concepts, properties, uses and sustainabilityIIT Madras · Free course courseMechanical Behavior Of Polymers And CompositesIIT Delhi · Free course courseProcessing of Polymers and Polymer CompositesIIT Roorkee · Free course courseNCERT textbooksncert.nic.inPhET interactive simulationsphet.colorado.eduSource and attribution
Original
Written by Technifyed. Free to use for your own school or college project; write the report in your own words. Added 1 Oct 2026.
Similar projects
More Chemistry projects
Chemistry · Physical Chemistry
Grow crystals and test what changes their size
Grow alum or sugar crystals and find how cooling speed changes crystal size.
Chemistry · Inorganic Chemistry
Investigate what speeds up rusting
Leave iron nails in different conditions for a week and find what makes rust form fastest.
Chemistry + Environmental Science
Model the effect of acid rain on building stone
Soak chalk and marble chips in liquids of different acidity and measure the mass they lose.
Chemistry + Crops, Soil and Horticulture
Map the pH of soil around your school
Test soil pH at ten spots round your school or home and draw a map of the results.
Two-subject alternatives
Agri-business and Food Science + Biology
Test how storage affects fruit and vegetable shelf life
Store the same produce in five ways and record weight loss and spoilage.
Geography + Environmental Science
Study a river or lake near you
Document the condition, uses and problems of a local water body and suggest how to protect it.
Astronomy and Space + Environmental Science
Measure light pollution in your area
Count the stars visible in one constellation from several places and map the darkness of the sky.
Agri-business and Food Science + Environmental Science
Estimate food waste in your household or canteen
Weigh food waste daily for two weeks, sort it by cause and test one way to reduce it.
Same difficulty and budget
Environmental Science · Waste Management
Audit your school's waste for a week
Sort and weigh one week of school waste by type and propose how to cut the largest share.
Biology · Zoology
Survey the birds of your neighbourhood
Do weekly point counts of birds at three sites and compare species between habitats.
Physics + Music, Theatre and Writing
Study the physics of a musical instrument
Measure how the length of a string or the water level in a bottle changes the pitch.
Environmental Science · Pollution
Measure air quality with sticky cards
Hang petroleum-jelly cards at five locations and compare the particles they collect in a week.