Wanhua Chemical official website
Wanhua Chemical Group Co., Ltd.
Wanhua Chemical official website →Transparency King · Materials & testing
Clear TPU Phone Cases: Materials & Testing
Clear phone-case quality starts with material selection. Explore the raw-material source, batch properties and testing documents to compare materials, review samples and prepare your wholesale inquiry.
Public manufacturer resources
Explore the raw-material manufacturer and Wanthane TPU portfolio through these official links. The documented WHT-3395U4 grade and lot 240976D0BF are presented separately in the raw-material COA summary below.
Wanthane TPU official product resources
Wanthane® TPU
Wanthane TPU official product resources →The TPU raw material we use
Transparency King clear phone cases use Wanhua Wanthane TPU. The material grade documented here is WHT-3395U4, used for both large and precision camera-cutout products. Review the corresponding case sample to compare clarity, camera openings and device fit.
Wanhua Chemical Group Co., Ltd.
Wanthane thermoplastic polyurethane (TPU)
- Material grade
- WHT-3395U4
- Lot number
- 240976D0BF
- Analysis date
- 2026-10-06
- Certificate of Analysis number
- 0009030933
Wanhua Chemical is the raw-material manufacturer; the material name identifies the material source.
Raw-material batch properties: WHT-3395U4
The values below are taken from the raw-material Certificate of Analysis (COA) issued by Wanhua Chemical, dated 6 October 2026. The tested sample is colourless transparent raw-material granules. These values describe that raw-material batch.
| Raw-material property | Batch result | Document specification | Test method |
|---|---|---|---|
| Hardness (Shore A) | 97 | 95–97 | ASTM D2240-15 (2021) |
| Ultimate elongation | 610% | ≥ 400% | ASTM D412-16 (2021) |
| Stress at 100% elongation | 13.1 MPa | ≥ 8 MPa | ASTM D412-16 (2021) |
| Stress at 300% elongation | 19.4 MPa | ≥ 12 MPa | ASTM D412-16 (2021) |
| Tensile strength | 38.3 MPa | ≥ 30 MPa | ASTM D412-16 (2021) |
| Tear strength | 159.6 N/mm | ≥ 100 N/mm | ASTM D624-00 (2020) |
These values apply to the tested raw material. Case thickness, geometry and processing conditions influence finished-product performance. Review the corresponding case sample alongside the material data.
Material testing for substances of concern
We have organised SGS material testing documents provided by the raw-material supplier, issued on 5 March 2026. The sample is named Wanthane TPUs. The following tests refer to colourless transparent granules.
| Test project | Scope recorded in the report | Reported result |
|---|---|---|
| RoHS restricted substances | 10 restricted substances | Pass |
| REACH SVHC | 253 SVHCs + 1 potential SVHC (list dated 2026-02-04) | Pass |
| PFAS screening | 671 PFAS listed in the report | Pass |
| Six elements | Chromium, arsenic, cobalt, copper, nickel and antimony | Tested analytes not detected (ND) |
| Phthalates | 7 analytes | Tested analytes not detected (ND) |
| Polycyclic aromatic hydrocarbons (PAHs) | 18 analytes | Tested analytes not detected (ND) |
| Organotin compounds | 7 analytes | Tested analytes not detected (ND) |
| Halogens | Fluorine, chlorine, bromine and iodine | Tested analytes not detected (ND) |
These reports name the sample Wanthane TPUs and do not identify grade WHT-3395U4 or the lot above. Document applicability should be checked with the supplier. Pass refers to the specified test criteria; ND means not detected at the method’s detection or reporting limit.
Additional total-extractives testing of TPU sheet
The supplier documents also include total-extractives testing under US FDA 21 CFR 177.2600 on a colourless transparent TPU sheet, with a reported Pass result. This is a test of a material sample; the finished phone case and its intended use are reviewed separately.
Anti-yellowing: finished-case xenon ageing testing underway
We are conducting xenon ageing testing on finished phone cases to assess colour changes under light-ageing conditions. When testing is complete, this page will add the tested models, method, exposure time, colour-change data and before-and-after comparisons to help buyers evaluate anti-yellowing performance.
- Tested device models and camera-cutout versions
- Test method, conditions and exposure time
- Colour-change data and before-and-after comparisons
Review material documents with your order requirements
Send the complete device models, large or precision cutout, quantities, destination market and document requirements. We will help you compare material documents, finished-case samples and packaging options. Current products include Transparency card packaging; stock and lead time are confirmed by model.
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Document summary updated: 11 October 2026