High-Temperature, Waterproof, and Oil Resistance Testing of Bioleader® Kraft and Paper Bowls

Introduction

With the growing demand for eco-friendly packaging solutions in the foodservice industry, the need for reliable, sustainable alternatives to plastic has never been more critical. Bioleader® provides biodegradable kraft and paper packaging that not only helps reduce plastic waste but also ensures high performance in real-world foodservice environments.

In this blog, we present the results of rigorous testing conducted on several Bioleader® kraft paper soup bowls and paper bowls. These tests simulate actual conditions where food packaging is exposed to high temperatures, water, and oil—common challenges faced in the foodservice industry. The testing environment combined boiling water with oil and soy sauce to simulate the high-temperature, oil-water mixture typical in food applications. A detailed video demonstration of the test results is also included.

The Importance of High-Temperature Resistance in Food Packaging

High-temperature resistance is crucial in food packaging, especially for applications involving hot liquids, soups, or fried foods. Many traditional plastics warp, leak, or release harmful chemicals under high heat, making them unsafe for food packaging. On the other hand, biodegradable materials like kraft and paper provide a safer, eco-friendly solution while maintaining their structural integrity under high temperatures.

High-temperature resistance is particularly important in the following applications:

• Microwave Heating: Food containers must be able to withstand high temperatures without losing shape or releasing harmful chemicals.

• Hot Soups & Stews: Containers must maintain their form when exposed to hot liquids, preventing leaks or deformation.

• Greasy Foods: Food packaging must resist oil penetration to prevent leakage and ensure the food stays safely contained.

Testing Methodology

Bioleader® conducted a series of tests to evaluate the performance of various kraft and paper bowls under real-world conditions. The test products included:

• Kraft Soup Bowl 12oz (water-based coating kraft paper)

• Kraft Soup Bowl 16oz (PE-coated kraft paper)

• Kraft Soup Bowl 12oz (PLA-coated kraft paper)

• Kraft Salad Bowl 1000ml (PE-coated kraft paper)

• White Paper Salad Bowl 1000ml (PE-coated white cardboard paper)

• Rectangle Kraft Bowl 500ml (PE-coated kraft paper)

• Square Kraft Bowl 1200ml (PE-coated kraft paper)

• Kraft Food Paper Box: 8# 45oz (1400ml)

Testing Environment:

We simulated real-world conditions using:

• 5000ml of boiling water (100°C)

• 100ml oil

• 100ml soy sauce

This mixture created a high-temperature, oily, and watery environment typical in foodservice applications (e.g., soups, sauces, and fried foods).

Test Focus:

• Heat Resistance: We tested the bowls by submerging them in the boiling oil-water mixture to see how they performed under high temperatures.

• Water Resistance: We assessed how well each bowl held the oil-water mixture for an extended period (30 minutes), observing for leakage, absorption, or deformation.

• Oil Resistance: We evaluated how the bowls handled greasy foods (e.g., fried food) by immersing them in the oil-water mixture and checking for any oil penetration or leakage.

Testing Time：

Test Results Overview

1. High-Temperature Performance

• Kraft Soup Bowl 12oz (Water-Based Coating):

  • This bowl performed reasonably well under high temperatures. It showed slight softening around the edges but retained its overall shape. There was no leakage or significant deformation during the test.

  • Key Observation: The water-based coating provided decent resistance to high temperatures but allowed for slight softening.

• Kraft Soup Bowl 16oz (PE-Coated Kraft Paper):

  • This bowl demonstrated excellent heat resistance. No softening, warping, or loss of integrity occurred when submerged in the boiling oil-water mixture.

  • Key Observation: The PE coating provided superior heat resistance, making this bowl ideal for hot food and liquids.

• Kraft Soup Bowl 12oz (PLA-Coated Kraft Paper):

  • The PLA-coated bowl showed performance similar to the PE-coated variant. It did not soften or lose its shape when exposed to the boiling mixture.

  • Key Observation: PLA provided similar heat resistance to PE but with the added benefit of being plant-based.

• Kraft Salad Bowl 1000ml (PE-Coated Kraft Paper):

  • This bowl showed no softening or deformation and withstood the high-temperature test with excellent results.

  • Key Observation: The PE coating ensured strong heat resistance, making it a reliable choice for both hot and cold applications.

• White Paper Salad Bowl 1000ml (PE-Coated White Cardboard Paper):

  • This bowl showed slight softening at the edges, but there was no structural damage or leakage.

  • Key Observation: Despite softening, the white paper salad bowl performed adequately for hot food applications.

• Rectangle Kraft Bowl 500ml (PE-Coated Kraft Paper):

  • The rectangular kraft bowl exhibited no softening or change in structure when exposed to the hot mixture.

  • Key Observation: The PE coating performed well, ensuring the bowl’s durability at high temperatures.

• Square Kraft Bowl 1200ml (PE-Coated Kraft Paper):

  • The square kraft bowl maintained its integrity during the high-temperature test without softening or warping.

  • Key Observation: The PE coating provided excellent heat resistance, making it ideal for both hot and oily foods.

• Kraft Food Paper Box 8# 45oz (1400ml):

  • The kraft food box showed no deformation or leakage under the boiling test conditions.

  • Key Observation: The 1400ml kraft box performed admirably, maintaining its shape and strength under high heat.

2. Water Resistance Test

• Kraft Soup Bowls (12oz, 16oz, PLA-coated, PE-coated):

  • All kraft soup bowls successfully contained the oil-water mixture for 30 minutes without any leakage or water absorption.

  • Key Observation: The PE and PLA coatings effectively prevented liquid from seeping through the material.

• Kraft Salad Bowls (1000ml, PE-coated):

  • These bowls passed the water resistance test with no leakage or seepage after holding the liquid for 30 minutes.

  • Key Observation: The PE coating provided excellent water resistance, keeping the bowls intact during the test.

• White Paper Salad Bowl (1000ml, PE-coated):

  • The white paper salad bowl showed minimal absorption at the edges but held the liquid without leakage for the full 30 minutes.

  • Key Observation: While the white paper showed slight absorption, the PE coating effectively prevented leakage.

• Rectangle Kraft Bowl (500ml, PE-coated):

  • This bowl successfully held the oil-water mixture without any leakage or softening.

  • Key Observation: The PE coating ensured the bowl remained leak-free and structurally sound.

• Square Kraft Bowl (1200ml, PE-coated):

  • The square kraft bowl performed well, holding the liquid without any issues.

  • Key Observation: The PE coating was highly effective in maintaining the bowl’s integrity during the test.

• Kraft Food Paper Box (1400ml):

  • The kraft food box contained the oil-water mixture without any leakage or deformation for the full 30 minutes.

  • Key Observation: The PE coating offered strong resistance to water, ensuring the box stayed intact.

3. Oil Resistance Test

• Kraft Soup Bowls (12oz, 16oz, PLA-coated, PE-coated):

  • These bowls withstood exposure to the oily mixture without any oil seepage or damage to the structure.

  • Key Observation: The PE and PLA coatings prevented oil penetration, ensuring the bowls remained intact even with greasy foods.

• Kraft Salad Bowls (1000ml, PE-coated):

  • The bowls performed excellently under greasy food conditions. There was no oil seepage, and the bowls maintained their shape.

  • Key Observation: The PE coating provided superior oil resistance, making these bowls ideal for fried and oily foods.

• White Paper Salad Bowl (1000ml, PE-coated):

  • The white paper salad bowl showed some oil absorption at the edges but did not leak.

  • Key Observation: While not as oil-resistant as kraft bowls, the white paper salad bowl still held up well under greasy food conditions.

• Rectangle Kraft Bowl (500ml, PE-coated):

  • This bowl demonstrated excellent oil resistance, keeping its form even with greasy foods.

  • Key Observation: The PE coating ensured the bowl’s durability against oil penetration.

• Square Kraft Bowl (1200ml, PE-coated):

  • The square kraft bowl performed well, preventing oil seepage and maintaining its structure.

  • Key Observation: The PE coating provided reliable oil resistance, making this bowl perfect for oily or greasy foods.

• Kraft Food Paper Box (1400ml):

  • The kraft food box handled oily foods without any issues. No oil seepage occurred, and the box remained intact.

  • Key Observation: The PE coating ensured that the box resisted oil penetration, making it suitable for greasy food applications.

Detailed Test Findings

Video Demonstration of Test Results

We’ve also included a video demonstration that showcases the entire testing process( Testing time: 20226-1-14). This video walks viewers through each step, from filling the soup containers with hot water and oil to checking for leaks or deformation after the test period. Watch the full video to see Bioleader’s Kraft soup bowls and paper salad bowls subjected to high temperatures, water, and oil.

Key Benefits of Using Heat-Resistant Paper and Kraft Bowls

• Eco-Friendly: Made from biodegradable kraft and paper, these bowls provide a sustainable alternative to plastic packaging.

• High-Performance: These bowls excel under extreme conditions—whether exposed to heat, water, or oil.

• Safe for Food: Free from harmful chemicals and safe for use with hot, oily, and watery foods.

• Versatile: Suitable for various food types, from soups to fried foods.

Conclusion

Bioleader®’s kraft soup bowls and kraft paper bowls have been proven to withstand high temperatures, water exposure, and greasy foods, making them an ideal choice for foodservice businesses looking for sustainable and reliable packaging solutions. The test results demonstrate that these bowls maintain their integrity and provide a safe and eco-friendly alternative to traditional plastic packaging.

Call to Action

Interested in ordering high-performance, eco-friendly packaging for your business?

Contact Bioleader® for bulk orders and to learn more about our full range of biodegradable bowls, containers, and packaging solutions.

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