Swellable Film Tape DMT‑3805
SEO information
Product Name: Swellable Film Tape DMT‑3805
SKU / Model No.: DMT‑3805
SEO Title: Swellable Film Tape DMT‑3805 | Electrolyte‑Activated Swelling Tape for Cylindrical Lithium‑Ion Batteries
URL Slug: swellable-film-tape-dmt-3805
Product Description: TONMAX DMT‑3805 swellable film tape for cylindrical lithium‑ion batteries. It expands three‑dimensionally under electrolyte action to fill cell‑to‑housing gaps, provides shock‑absorbing performance, slows battery degradation and extends lifespan. Volume expansion＞247%@RT,＞254%@85℃. It will not cause electrolyte discoloration and keeps good mechanical strength after swelling. Serves as alternative for imported TAPEX tape. Suitable for power‑tool, vehicle and energy‑storage cylindrical batteries. Store in cool dry indoor environment.
Keywords: Swellable Film Tape DMT‑3805,cylindrical battery swellable tape,electrolyte activated swelling tape,large‑format cylindrical battery tape,power battery anti‑vibration tape,energy‑storage cylindrical battery tape,3D volume‑expansion battery tape,alternative to imported TAPEX swelling tape
Swellable Film Tape DMT‑3805 For Cylindrical Batteries
Product Overview
TONMAX DMT‑3805 swellable film tape is a high‑performance functional tape specially developed for cylindrical lithium‑ion batteries. Under electrolyte exposure, the tape achieves three‑dimensional volume expansion, filling gaps between bare cell and battery housing. It delivers excellent shock‑absorbing and anti‑vibration performance, mitigates battery capacity degradation and prolongs cycle service life. It acts as a reliable alternative to imported TAPEX swelling tape. Processing workflow: wrap and bond tape onto bare cell → insert cell into can → bake for dehydration → inject electrolyte → tape swells in‑situ.
Main Applications
• Small‑format cylindrical power batteries for power‑tool equipment
• Large‑format cylindrical power batteries for EV‑onboard systems and e‑bikes
• Energy‑storage cylindrical lithium‑ion batteries requiring superior shock‑resistance
• Gap‑filling & vibration‑buffering wrapping material for various cylindrical jelly‑roll cells
Core Advantages
✅ No electrolyte discoloration after immersion, chemically inert to battery electrolyte
✅ Higher volume expansion ratio:＞247% at room temperature;＞254% under 85℃ high‑temperature condition
✅ Maintains excellent elasticity and mechanical strength after swelling, not easy to crack during handling
✅ After natural air‑drying, dimensions recover while elasticity and toughness are still preserved
✅ Passes long‑term 85℃ high‑temperature electrolyte soaking test; adhesive layer remains intact without delamination
✅ Flexible customizable film thickness, stable and consistent mass‑supply capacity
Storage Note: Store in cool, dry indoor warehouse. Avoid direct sunlight, high‑temperature and humid surroundings.
| Item | DMT‑3805 Specifications | Test Condition |
|---|---|---|
| Total Thickness | 54 μm | Base film 48 μm + pressure‑sensitive adhesive 5 μm |
| Appearance | Light‑blue semi‑transparent | Visual inspection |
| Room‑temp electrolyte soaking volume expansion rate | ＞247% | 25 mm×25 mm sample, soaked 4 h at room temperature |
| 85℃ electrolyte soaking volume expansion rate | ＞254% | 25 mm×25 mm sample, soaked 4 h at 85℃ |
| Post‑swelling performance | Film complete, adhesive layer no peeling; retains good elasticity & strength | Room‑temp & 85℃ soaking test |
| Electrolyte influence | Electrolyte remains clear, no discoloration | Soaking test |
| Post‑drying property | Dimension recovery; maintains elasticity & tear‑resistance | Soaked 4 h + natural air‑dry 24 h |
| Customization | Base‑film thickness can be customized | ‑ |
Receiving, Inspection & After-sales Policy
Reliable Quality · Professional Service · Long-term Partnership
Huizhou Dongming New Energy Materials Co., Ltd. is committed to supplying dependable material products and professional customer support. To help you fully understand the acceptance procedure, application requirements, storage specifications and after-sales liabilities, please read the following terms carefully before purchasing and using our products.
1、Inspection upon Receipt
Within 3 working days after receipt of goods, the customer shall unpack and inspect the shipment, and verify the model, specification, quantity and appearance of products. If any abnormality such as damage, wrong delivery or model mismatch is found, please contact us with photos or videos as evidence. Failure to notify us within the time limit shall be deemed acceptance of the product in terms of appearance and quantity.
2、Product Application Scope
All technical data of our products are typical values obtained from standard laboratory tests, for reference only in product selection. Customers shall conduct sampling tests and reliability verification in advance according to their own working conditions, service environment and assembly requirements, and confirm compatibility before mass use. Product failure caused by skipping pre-sample verification or operating beyond the rated temperature, pressure and other permissible conditions is not covered by warranty.
3、Storage & Shelf Life
Products shall be hermetically stored in a cool, dry and dark place. Keep away from high temperature, moisture, oil contamination and prolonged UV exposure. Use the products within the shelf life marked on the label. Deterioration or premature aging resulting from improper storage by the customer is excluded from after-sales service.
4、Handling of Quality Claims
If the non-conformity is confirmed by both parties to be an inherent material quality defect, we will prioritize replacement, supplementary delivery, or negotiate a refund. We shall NOT be liable for any indirect losses including secondary processing, finished product assembly, construction work, production shutdown losses, etc.
5、Exclusions from After-sales Warranty
① Damage caused by expired shelf life or improper storage conditions;
② Quality complaints raised after the customer cuts, processes or modifies the products;
③ Wrong product selection or operation beyond permissible working conditions;
④ Man-made damage, tearing by external force, or corrosion by chemicals;
⑤ Damage caused by force majeure such as fire, flood and other natural disasters.
6、Miscellaneous
If special warranty terms or after-sales arrangements are separately agreed between the customer and our company, the provisions stipulated in the formally signed contract shall prevail. For further information about product specifications, application suitability, storage guidance or after-sales support, please reach out to our customer service team. We value long-term cooperation and keep providing stable material solutions and professional support for our partners.