Making a purchasing decision between a silicone sponge and a regular sponge will have a significant impact on your business. And we will compare the key performance differences between silicone sponge and regular sponge to help you clearly understand how to choose the right one.
Silicone Sponge vs Regular Sponge: Key Performance Comparison
Water Absorption
The key difference between regular sponges and silicone sponges lies in their pore structure, which determines their water absorption. This directly determines the applications for the sponge you purchase.
Regular Sponges: Regular sponges usually refer to polyurethane foam,cellulose sponges and melamine sponges. Ordinary polyurethane foam is basically an open-cell structure. The pores can be interconnected, so they can absorb between 1000% and 3000% of their own weight in water.
Silicone Sponges: The silicone sponges you commonly use are mostly of closed-cell structure, with the cells tightly sealed together, preventing water from penetrating. Therefore, their water absorption rate is less than 1% of their own weight.
Temperature Resistance Range
Product extreme temperature resistance is a key consideration. The temperature performance gap between ordinary sponge and silicone sponge directly affects your final products’ export applicability and safety certification pass rate.
Regular Sponges: Take polyurethane foam as a typical regular sponge. Its molecular structure leads to weak temperature resistance. Long-term exposure above 80°C causes softening, decomposition and harmful substance release; under -20°C, it will become hard and brittle, and will easily break with just a little external force.
Silicone Sponges: In contrast, silicone sponge features stable siloxane molecular bonds for outstanding temperature resistance. Standard closed-cell silicone sponge supports long-term use from -60°C to 230°C. Special customized formulas enable short-term resistance up to 315°C, maintaining low-temperature flexibility without hardening or cracking.
Service Life
The compressive set is a crucial factor in evaluating the durability of a sponge, as it affects the frequency of your replacements and the satisfaction of your customers.
Regular Sponges: With ASTM D1056 testing at 70°C for 22 hours, regular sponges deliver a compression set over 30%, resulting in failed sealing and cushioning. Their performance is likely to decline significantly within the next 6 to 12 months.
Silicone Sponges: By comparison, a silicone sponge achieves only 10%–20% compression set under identical conditions. You can expect its performance to remain stable for 3 to 5 years or even longer.
Flame Retardancy
If you are involved in the electronics or new energy vehicle industry, you will know that flame retardancy is a mandatory safety regulation, which is of vital importance for product certification and legal sales.
Regular Sponges: Conventional polyurethane foam is highly flammable. It burns rapidly, emitting thick black smoke and toxic gases such as CO, which can pose a fatal danger to you in a confined space.
Though you add flame retardants, this will alter its softness and elasticity. Moreover, many halogen-based additives fail RoHS and REACH standards, with their fire resistance fading over time from cleaning and aging.
Silicone Sponges: By contrast, silicone sponge features innate flame retardancy thanks to its silicon-oxygen molecular structure. It forms a protective layer under fire, self-extinguishes away from heat, and emits minimal low-toxic smoke.
Here is the table we have compiled for you regarding the certification standards:
| Certification | Application Field | Significance |
| UL94 V-0 / HB | North America, Electrical and Electronic Products | V-0 (vertical, high grade, strong self-extinguishing) and HB (horizontal, low grade); grade depends on formula. V-0 is essential for electronic enclosures, etc. |
| FAR 25.853 | Aerospace | Core standard for flame spread tests of aircraft interior materials. |
| NFPA 130 | Rail Transit | Mandatory fire safety standard for rail transit vehicle materials. |
| SMP 800-C | Rail Transit / General Purpose | Evaluates combustion gas toxicity; specifies limits for harmful substances released during burning. |
Antibacterial Property
When producing sponges for cosmetics, personal care, medical and kitchen use, antibacterial performance is your top priority. It greatly affects your customer repurchase rates and brand reputation.
Regular Sponges: Regular open-cell sponges easily trap moisture, oil and cosmetic residues inside pores. The damp interior breeds bacteria, and deep dirt cannot be fully removed by simple rinsing, leading to user complaints.
Silicone Sponges: Made with a closed-cell structure, silicone sponge blocks liquid penetration. Its inert material resists bacteria growth, and the smooth surface allows easy, thorough cleaning with just a light rinse.
You may also add food-safe and medical-grade silver ion additives to inhibit over 99% of common bacteria. The stable antibacterial effect lasts long-term and will not fade with repeated washing.
How to Choose between Silicone Sponge and Regular Sponge?
Market and Cost
From the perspective of market access, silicone sponge is more likely to obtain authoritative certifications such as FDA and LFGB, helping your product enter the market.
From a cost perspective, the materials and manufacturing costs of regular sponge are relatively lower. Therefore, if you are just entering the sponge market, we recommend that you choose regular sponge to avoid significant losses.
Brand and Consumers
From the perspective of the brand, if you aim to build a high-end brand and gain more brand value, we recommend choosing a silicone sponge. This way, you can create more selling points for your product and then promote and market it.
From the perspective of consumers, if you want to have a large consumer base, you should opt for cheaper materials and regular sponges. Because daily household items are usually replaced every 1 to 2 months, most consumers are sensitive to prices.
Packaging and Transportation
We suggest that you carefully select different types of sponge materials, as their water absorption rates are different, and thus the packaging requirements will also vary. If your sponge products, especially the silicone ones, are used in the medical or cosmetics industries, they will require even higher standards for packaging.
If your goods are also transported by sea, regular sponge has a higher water absorption rate and may affect the quality, while silicone sponge is safer because during shipping there is a possibility of contact with moisture or high-humidity air.
So you need to confirm with the supplier about the water absorption capacity of the purchased sponge, as well as the corresponding packaging and transportation methods.
Industry and Applications
The requirements for sponges vary across different industries and applications. Below is the relevant table we have prepared for you:
| Application Field | Silicone Sponge | Regular Sponge |
| Industrial Machinery | Closed-Cell Silicone Sponge (sealing, dust-proof, water-proof, heat-resistant and corrosion-resistant) | Not Recommended (poor performance in high-temperature, high-humidity and strong chemical environments) |
| Cosmetic Tools | Silicone Beauty Sponge Surface (no powder absorption, easy to clean, antibacterial) | Open-Cell Foam Sponge (low price but causes cosmetic waste and has the risk of bacterial accumulation) |
| Medical/Dental/Rehabilitation | Medical-Grade Silicone Sponge (ISO 10993, skin contact pads) | Not recommended for implantation or long-term skin contact (high risk of leachables) |
| Automotive/Aerospace | Flame-retardant, extreme temperature sealing and shock absorption | Padding (replacing regular PU can achieve NVH noise reduction, but not resistant to engine high temperature) |
| Household Cleaning | Rarely used (high cost) | Daily cleaning sponges/dishwashing sponges (water absorption performance is important) |
| Electronic Equipment | Cushion pads (requires the addition of fillers, with extremely high costs) | Low-end electrostatic dissipative foam, internal shock absorption |
| High and Low Temperature Environments | Extreme temperature elasticity, sealing solution from -60°C to 230°C | Not applicable (high-temperature aging, low-temperature embrittlement) |
FAQ
Does Silicone Sponge Have an Open-Cell Structure? What About Its Performance?
Yes. However, the open-cell structure silicone sponge does not fall into the mainstream category. Moreover, its water absorption rate is higher than that of the closed-cell structure silicone sponge.
May be slightly better than that of regular open-cell sponges due to silicone’s inertness, but the difference is not significant. And temperature resistance and service life basically retain the advantages of the silicone material.
How Is the Environmental Compliance of Silicone Sponge?
During the production process of your silicone sponge, there will be no consumption of ozone-depleting substances, and the silicone sponge itself does not release plasticizers. After aging, the degradation products are mainly silicon dioxide, which is non-toxic and odorless.
Furthermore, the silicone sponge does not contain any harmful heavy metals or other restricted substances.
Is Regular Sponge (Polyurethane Foam) Really Not Environmentally Friendly?
Conventional polyurethane foam often has a strong odor due to residual VOCs; however, low-VOC or solvent-free versions exist that are odorless. After the production process is completed, there may still be volatile organic compounds inside the sponge. Long-term contact with the skin or inhalation of these substances may pose health risks.
Moreover, this type of sponge is difficult to recycle after being discarded, and when burned, it will produce toxic smoke.
Can Silicone Sponge Be Composite with Other Materials?
Yes. Silicone sponge can be combined with various supporting materials such as cloth, mesh, film, non-woven fabric, plastic sheet, etc. by using pressure-sensitive adhesive.
What Are the Optimal Storage Conditions of Silicone Sponge?
Silicone sponge can be stored for a long time at room temperature, in a dark environment, and with a temperature not exceeding 35°C, without undergoing physical degradation. We suggest that the storage temperature be maintained between 16°C and 27°C, and the humidity between 40% and 75%.
Final Thoughts
Legensilico is a professional silicone manufacturer in China, capable of providing you with a variety of silicone products and customized services. If you would like to know more about the silicone sponge, please feel free to contact us at any time.
