Plastic Materials in Insulated Drinkware: Where They’re Used and Why

Overview

The stainless steel body is the main structure of most insulated bottles, but many of the product's functional details depend on plastic components. Lids, stoppers, handles, decorative rings, straws, locks, and sealing parts may all use different materials.

A single bottle can therefore contain several types of plastic. The reason is simple: each component has different requirements for heat resistance, strength, flexibility, wear resistance, transparency, or dimensional stability.

For B2B drinkware development, material selection is not about finding one material that works everywhere. It is about matching the right material to the function of each component.

Common Plastic Materials in Insulated Drinkware

PP: A Versatile Material for Drinkware Components

Polypropylene (PP) is one of the most widely used plastics in insulated drinkware. It offers good injection molding performance, good toughness, low weight, and resistance to acids, alkalis, tea, coffee, and fruit beverages.

Standard PP can withstand boiling water around 100°C, while some heat-resistant grades can withstand temperatures of approximately 130°C. This makes PP suitable for bottle lids, bottoms, middle rings, inner liners, and drinking spouts, as well as selected components exposed to higher temperatures.

The typical shrinkage rate of PP is 1–2.5%, which needs to be considered in mold and component design.

PE: Lightweight Material for Simple Components

Polyethylene (PE) is relatively soft, lightweight, and odorless. It is generally used where high-temperature resistance is not the primary requirement.

Typical applications include dust-proof outer covers, protective caps, small containers, and other simple or blow-molded components. Its typical shrinkage rate is 1.5–4%.

PA / Nylon: Strength for Structural Components

PA (Nylon) is a high-performance engineering plastic with good mechanical strength, wear resistance, self-lubricating properties, chemical resistance, and impact resistance.

It can be used for handle connecting blocks, connecting rods, precision clips, rotating structural parts, and threaded components that do not directly contact beverages. Glass-fiber-reinforced Nylon can provide higher strength, heat resistance, and dimensional stability. The typical shrinkage rate is 1.5–3% for standard Nylon and 0.4–0.8% for reinforced Nylon.

POM: For Locks and Moving Parts

Polyoxymethylene (POM) combines high hardness, rigidity, dimensional stability, and low friction. These properties make it suitable for components that slide, rotate, or repeatedly engage with other parts.

Typical applications include locks, buttons, connecting components, and other moving or wear-resistant mechanisms. Its typical shrinkage rate is 1.5–2.5%.

Tritan: Transparency and Durability

Tritan is known for its high transparency, strength, and toughness. It can be used for transparent bottle lids, outer covers, clips, and other components where both appearance and mechanical performance are important.

Tritan can also be used for beverage-contact components when the selected grade meets the applicable food-contact requirements. Its typical shrinkage rate is 0.4–0.7%.

ABS: Functional and Decorative Components

ABS offers good strength, wear resistance, and surface appearance. It can be used for decorative outer covers, bottle sleeves, buttons, locks, rotors, and other exterior components. Electroplating-grade ABS can also be used for decorative plated parts.

Standard ABS generally has limited heat resistance, usually below approximately 80°C, so it is not normally preferred for components that directly contact hot water. Its typical shrinkage rate is 0.4–0.7%.

TPE: Soft Touch and Grip

Thermoplastic Elastomer (TPE) provides rubber-like elasticity, flexibility, cushioning, and anti-slip performance. It can also be combined with harder plastics such as PP through overmolding.

TPE is commonly used for soft handles, anti-slip grips, soft-touch areas, overmolded components, and selected sealing applications when the material grade meets applicable food-contact requirements.

Depending on the grade, TPE hardness can range from approximately Shore A 30–90, with a typical shrinkage rate of around 1–3%.

Why Are Different Plastics Used in the Same Bottle?

Different components perform different jobs, so using one plastic throughout the product is not always practical. A lid may need heat resistance, while a lock needs wear resistance and dimensional stability. A transparent component may require high clarity and toughness, while a handle needs flexibility and a comfortable grip.

This is why material selection should be based on the function, location, and operating conditions of each component.

What Should Brands Consider When Selecting Plastic Materials?

For OEM and ODM drinkware, plastic selection should match the component's temperature exposure, food-contact requirements, mechanical demands, appearance, and dimensional stability. Different materials are suited to different functions.

Plastic Materials and Food-Contact Requirements

Plastic components that directly contact beverages need to meet the applicable food-contact requirements of the target market. For products sold in China, the provided references include GB/T 29606-2026, GB 9685-2016, and GB 4806.1-2016; for Japan, JIS S 2006:2019; and for Europe, BS EN 12546-1:2000. Specific requirements depend on the material, component, intended use, and destination market.

Plastic Material Selection for OEM Drinkware

A single drinkware product may use several plastic materials for different components. For example, PP for suitable lid parts, Tritan for transparent components, Nylon or POM for mechanical parts, and TPE for soft-touch areas. At Ansune, material selection is considered together with molding, assembly, and quality control to support consistent OEM and ODM production.