Plastic plays a huge role in food packaging and storage. But not all plastics are safe to come into contact with your meals. This is where food-grade plastic comes in. In this article, we’ll explain what food-grade plastic is, break down the most common types, and show you how to identify safe plastic for storing and packaging food.

What Is Food-Grade Plastic?

Food-grade plastic refers to plastic materials that are safe to come into direct contact with food or beverages. This means they do not release harmful chemicals or contaminants that could affect the taste, smell, or safety of what you're eating or drinking.

Some foods and drinks—especially acidic or hot items—can cause chemical substances to leach from non-safe containers into the food. That’s why using the correct plastic is so important.

In the United States, the Food and Drug Administration (FDA) regulates food-grade plastics under the Federal Food, Drug, and Cosmetic Act. Materials used for food contact must not cause harmful effects, either chemically or physically, when they come in contact with food.

Types of Food-Grade Plastics

Food-grade plastics are commonly labeled with recycling codes, which indicate the type of plastic used. Here are the main categories:

1. PET (Polyethylene Terephthalate)

Common uses: Water bottles, soda bottles

PET is lightweight, strong, and transparent. It’s widely used for packaging carbonated drinks and bottled water. While it’s safe for single use, it’s not suitable for hot liquids. PET can only tolerate heat up to around 70°C (158°F). Exposing it to high temperatures can cause it to warp and potentially release harmful substances.

Tip: Avoid reusing PET bottles for hot beverages or long-term food storage.

Interestingly, PET was first used for fibers and films before becoming popular for drink bottles in the 1970s. Today, PET container is used not just for beverages but also for sauces, detergents, oils, and personal care products.

2. HDPE (High-Density Polyethylene)

Common uses: Milk jugs, shampoo bottles, cleaning product containers

HDPE is a sturdy plastic with high resistance to chemicals. It can handle temperatures up to 110°C (230°F), making it safer for food packaging. It's also commonly used in supermarket plastic bags and household containers.

However, if HDPE containers are used for chemicals like detergents or soaps, do not reuse them for food—even if washed—because residues can stick around and become a breeding ground for bacteria.

3. LDPE (Low-Density Polyethylene)

Common uses: Plastic wraps, grocery bags, squeezable bottles

LDPE is flexible and lightweight but not heat-resistant. Most plastic wraps and food films are made from LDPE, which starts melting at around 110°C. If you microwave food with plastic wrap still on, the heat and food oils can cause harmful chemicals to leach into your meal.

Tip: Always remove plastic wrap before reheating food in the microwave.

4. PP (Polypropylene)

Common uses: Microwaveable food containers, yogurt cups, reusable food containers

PP is heat-resistant up to 130°C (266°F), making it the only common plastic safe for use in microwaves. It’s also resistant to acids and bases and does not easily absorb moisture.

Some microwaveable containers might have a PP body (code 5) but a PS (Polystyrene, code 6) lid. Since PS isn’t heat-resistant, always remove the lid before microwaving.

PP container is often used for packaging soy milk, juice, pudding, and also larger items like water buckets and plastic baskets.

5. PS (Polystyrene)

Common uses: Disposable foam food boxes, instant noodle cups

PS is cheap and easy to mold, but it should not be used in high heat. That includes microwaving or putting hot, oily food directly into a PS container. Heat can cause PS to release styrene, a chemical that may affect human health. Also avoid using it with acidic items like orange juice, which can cause chemical breakdown.

Tip: Never microwave food in foam containers.

6. PC (Polycarbonate) and Other Plastics

Common uses: Water bottles, baby bottles, large reusable containers

PC used to be very popular, especially in water bottles and baby bottles, but it’s now controversial because it can contain bisphenol A (BPA)—a chemical that may leach into food and drinks, especially when heated.

If you see a recycling code of PC or another type of plastic. To reduce risks:

· Don’t pour hot water into PC bottles.

· Avoid using in direct sunlight.

· Don’t wash them in dishwashers or with hot water.

· Replace if scratched or damaged.

Safe use tip: Wash new containers with baking soda and warm water, then let them air dry.

How to Tell If a Plastic Product Is Food-Safe

Not all plastic containers are suitable for holding food, especially if they are exposed to heat or stored for long periods. Here are some practical tips to help you judge whether a plastic item is food-grade—even if it doesn't have an official certification.

Check for “Food Contact Safe” Symbols or Labels

Manufacturers may label food-safe plastic products with one or more of the following:

· A fork and cup symbol (common in the EU and Asia)

· The words "Food Safe" or "For Food Contact"

· A resin name such as PET, HDPE, PP, etc.

If a plastic item is missing any of these indicators, it's safer to assume it's not intended for direct food use.

Inspect the Material Name

If you know the plastic type, here’s a general guideline:

Material | Safe for Food Use? | Notes

PET | Safe for cold use | Not suitable for hot liquids

HDPE | Safe | Common in milk jugs and food storage

LDPE | Safe for low temperatures | Often used in plastic films, not for microwaving

PP | Safe and heat-resistant | Ideal for microwaving and reheating

PS | Limited use | Not recommended for hot or acidic foods

PC | Controversial | May contain BPA, avoid heat exposure

Final Thoughts

Using the right plastic for food storage and packaging is more important than many people realize. Food-grade plastics are carefully tested to make sure they don’t contaminate your food or pose long-term health risks.

When choosing a plastic container for food:

· Check the recycling code.

· Avoid reheating with non-microwave-safe materials.

· Don’t reuse plastics that were originally for cleaning products.

· Replace worn, scratched, or old containers.

Knowing these basics helps you make safer choices—whether you're packing a lunch, heating up leftovers, or selecting packaging for a food product.