In the daily life of the MTF community, MTF breast forms are not only essential body modification tools but also key accessories to enhance gender identity and quality of life.
However, with a wide range of breast form fillers available on the market, how can you choose the most suitable product based on material characteristics?
This article will scientifically analyze the advantages and disadvantages of three mainstream fillers: silicone gel, hydrogel, and plant fiber.
We aim to help you make a more precise choice by comparing their physical properties, realism, comfort, and application scenarios.
1. The Three Common Types of MTF Breast Form Fillers
In the industry, MTF breast form fillers typically fall into the following three categories:
- Silicone Gel: Its main component is crosslinked siloxane, known for its durability and realistic texture that resembles fat, though it is relatively heavier. The cost is approximately 50 to 80 per kilogram.
- Hydrogel: Composed mainly of polyvinyl alcohol (PVA) and glycerin, it is durable, feels relatively cool to the touch, and is lighter than silicone gel, though it may lose moisture through evaporation. The cost ranges from 30 to 50 per kilogram.
- Plant Fiber: Usually made of cotton and other materials, plant fiber is dry, fluffy, and elastic. It is significantly lighter than the other two but with a less realistic texture. The cost is around 5 to 10 per kilogram.
Here we briefly introduce these three types’ advantages, disadvantages, and costs. Next, we will delve into their specific pros and cons, how they affect practical use, and their suitable application scenarios.
2. Advantages and Disadvantages of Silicone Gel
Multi-directional Flow Similar to Human Fat
The main chain structure of silicone gel has a bond angle of 142° and a low bond energy of 452 kJ/mol, allowing easy rotation and similar multidirectional flow to fat cells (Source: Journal of Polymer Materials, Vol. 41, 2022).
This characteristic makes the dynamic naturalness of MTF breast forms remarkably high, such as a ±2.5 cm swing amplitude while walking, closely resembling the movement of real breasts.
Viscoelasticity Similar to Human Fat
Property Silicone Gel Human Fat
Elastic Modulus 10-15 kPa 5-20 kPa
Energy Loss Factor 0.35-0.45 0.4-0.6
Creep Rate (30min) 12-18% 15-25%
This delayed rebound feature, similar to the slow recovery process of fat under pressure, makes the visual and tactile elasticity resemble that of real breasts when touched, pressed, or subjected to rapid pressure (like during running).
Additionally, this viscoelasticity can reduce the impact force on the chest wall when the wearer is in motion.
Thermal Conductivity Close to Human Fat
The thermal conductivity of silicone gel (0.2 W/m·K) is almost identical to that of fat tissue (0.21 W/m·K), allowing it to reach a temperature of 32-34°C within five minutes of skin contact, similar to body surface temperature.
When wearing MTF breast forms, the temperature quickly aligns with the body, reducing the sensation of a foreign object and increasing realism.
Microfluidity Similar to Human Fat
The migration path of free silicone oil molecules within silicone gel is highly similar to the movement of triglycerides in fat cells (as evidenced by CT scan comparisons).
This feature gives MTF breast forms a high degree of static realism, allowing them to spread naturally without stiff edges when the wearer is lying down.
Therefore, silicone gel offers a high degree of realism in static and dynamic situations, such as walking, running, or swimming, closely matching the movement and appearance of real breasts.
While the texture, pressure elasticity, and durability are comparable to human fat, the weight is significantly heavier than the other two materials. Below is a comparison of the weight of one D-cup breast form:
- Silicone Gel: 350-400 g
- Hydrogel: 280-320 g
- Plant Fiber: 80-100 g
3. Advantages and Disadvantages of Hydrogel
Lightweight
The density of hydrogel is lower than that of silicone gel, making it lighter and reducing trapezius muscle strain, which helps alleviate shoulder and neck pressure for long-term wearers.
Softer Texture
Hydrogel is less complex than silicone gel, resulting in a softer feel and a more comfortable experience.
Cooler Sensation
Due to its evaporative cooling effect, the surface temperature of hydrogel is about 2-3°C lower than that of silicone gel (validated by infrared thermal imaging), making it ideal for hot summer wear.
Disadvantage
The water content tends to evaporate, resulting in a lifespan of approximately 2-3 years.
4. Advantages and Disadvantages of Plant Fiber
Extremely Lightweight
MTF breast form fillers are made from plant fibers and typically contain cotton or bamboo fiber. They offer good breathability, fluffiness, and softness, and place almost no pressure on the wearer’s shoulders.
Easy Replacement
Plant fiber is very convenient to replace for detachable MTF breast forms. The process is fast and straightforward: remove the old filler and insert the new one.
Disadvantage
This type’s realism is significantly lower, whether in terms of texture or detailed shape, compared to the other two types.
5. Application Scenarios for the Three Types of MTF Breast Form Fillers
Silicone Gel is suitable for long-term daily wear, water activities (such as swimming), and extended film shooting requiring a realistic effect.
Hydrogel is ideal for summer, the early stages of gender exploration, or temporary social scenarios like dates and parties where realism is needed.
Plant Fiber is best for fitness and sports (to reduce burden), travel requiring compression or concealment, temporary use, or short-duration filming where high realism is not essential.
Conclusion
Choosing MTF breast form fillers is not simply about selecting the most realistic or lightest option. To find the most suitable type, it is essential to consider personal needs and application scenarios.
Bluerabbit sex toy supply chain aims to provide a variety of adult toys for businesses. Offers MTF breast forms filled with either silicone gel or high-elastic cotton. You can freely choose the filler for the same MTF breast form. The wholesale price may vary based on the selected material.
