Dongguan Zejin Biotechnology presents Cryozin as its international-facing brand for reusable hot and cold products. Its published range combines sealed thermal packs with body-shaped formats, textile covers, straps and private-label packaging. The company describes development and manufacturing in Dongguan, Guangdong, serving brands, distributors and bulk-purchasing programs.
What the published manufacturing scope means for a buyer.
The useful distinction within this range is the complete product system: a flat gel pouch, a wrap with a removable insert, a segmented PCM liner and a click-activated warming pack involve different constructions and approval decisions. The reviewed 27-page catalog shows these formats alongside eye and face masks, cooler packs, cooling garments and pet mats. Current product pages add more specific guidance on selecting a managed variant, defining its materials and approving the finished sample. [1] [11]
The catalog separates shaped sealed packs from textile-cover-and-insert systems, while current pages distinguish PCM cooling from disc-activated warming. Buyers can use that range to compare a simple branded pouch with a multi-part wearable kit instead of treating every product as an interchangeable ice bag. [9]
The customization page covers dimensions, fill amount, contour, outer material, printing, straps, covers and packaging. This gives a private-label brief several coordinated variables: changing the pouch geometry may also change the fill, fit, artwork and package, so the approved sample needs to represent the complete configuration. [2]
Cryozin describes incoming-material checks, formula-batch review, filling-weight control, high-frequency sealing, leakage checks, thermal evaluation and packing inspection. This sequence gives buyers a concrete basis for requesting inspection records and setting repeat-order controls around the selected pack. [4]
CNFX synthesis of the company’s published information.
The reviewed products illustrate three different development routes. Catalog dimensions and material labels are reference information; the current product specification and approved sample define what is ordered.
The range includes rectangular pouches, eye and face formats, and packs held in textile covers or by straps. A reviewed rectangular listing proposes a 15 × 29 cm PVC format; its fill weight and exact construction remain open specification fields. For wraps, distinguish the sealed insert from the washable cover, closures and included accessories. [6]
A reviewed helmet-liner page shows a nominal 22 cm segmented, circular format; the catalog also shows cooling vests and neck formats. The liner is an accessory to evaluate with a particular helmet, suspension and padding, not a universal fit. PCM selection, chamber geometry and finished-system temperature testing belong in the project specification. [7]
The current warming-pack page shows an internal activation disc and several shapes. It identifies a sodium-acetate product family, distinct from an ordinary microwave heating pad despite its legacy URL. Select one managed model and agree the formulation, disc arrangement, activation and reset instructions before approving labels or a mixed assortment. [8]
The catalog includes flexible packs for coolers, segmented sheets, seat cushions and pet mats. These provide different pack-out and surface formats; food or medicine imagery is not a validated shipping qualification. Define the container, payload, temperature band and handling conditions for a shipping program, or the fit and cleaning requirements for a mat. [9]
Published processes, organized by production stage.
Cryozin separates private labeling of an existing format, modification of an established construction and new OEM development. Start with the intended product, destination market, order quantity and the feature that must change; this determines whether the work is mostly artwork or involves geometry, tooling and sampling. [5]
Specify the pouch film or laminate separately from any fleece cover or neoprene-style sleeve. The published material guide offers PVC, TPU and nylon-laminate directions, with gel, beads, PCM or sodium-acetate fills. Grade, thickness, fill mass, chamber layout and conditioning method must be tied to the selected construction. [3]
The OEM workflow links drawings, tooling decisions, physical samples, artwork, packaging and inspection criteria. Agree tooling ownership and revision responsibility, retain the approved reference, and close any fit or thermal questions before authorising a production run. [5]
The quality page describes first-piece and in-process checks, filling-weight and sealing controls, agreed leakage methods, thermal checks and final packaging review. Ask for a project inspection plan and batch-release record that use the same specification as the approved sample. [4]
The published quality workflow is most useful when converted into checks for the exact pouch, insert or wearable assembly being bought.
Cryozin lists seal, leakage, flexibility, thermal-cycle and repeated-use evaluation. Agree the preparation method, measurement points, environment, acceptance limits and sample identity. A material name or a catalog cooling-time claim alone does not define performance of the finished assembly. [4]
The helmet-liner page calls for checking clearance, ventilation, suspension and retention on the actual helmet. The warming-pack page separately calls for model-specific activation and reset instructions. These are different approval tasks, and a generic hot/cold instruction sheet should not replace either one. [7]
The document gallery contains files for more than one holder: the displayed ISO 13485 file names Dongguan Huize Outdoor Products, while the French packaging document names Dongguan Zejin Biotechnology. Build the purchase file around the agreed manufacturing site and product scope, with current documents for that arrangement rather than transferring all gallery marks to the Zejin name. [10]
These matches are CNFX's analysis of the published formats and development workflow, rather than claims of clinical outcomes or verified customer projects.
Brands and distributors can compare an established pouch or mask with a kit containing a cover, strap and retail pack. The first useful decision is whether differentiation requires new construction or can be achieved through an existing format, colour, print and packaging. [5]
PCM liners and garments offer a route for a defined accessory program. Evaluate the finished item with its intended equipment and use environment; select the size, phase-change specification, preparation instructions and test endpoint together. [7]
The broad catalog can support a coordinated range of shapes and pack systems. Manage each variant with its own BOM, artwork and packing reference so changes in colour or appearance do not obscure a change in material, fill or included components. [9]
CNFX procurement assessment.
Cryozin may fit buyers developing a reusable pack or wearable kit that combines thermal filling, flexible construction and private-label presentation. Its About page publishes general starting quantities of 500 pieces for most families and 300 for pet cooling mats and PCM cooling vests. Obtain a quotation for the actual variant, sampling, tooling and packaging; production timing should state its approval trigger and the manufacturing site used for the order.
Website research · 2026-10-01
Prepared from Cryozin / Dongguan Zejin Biotechnology’s English website. Capability descriptions and application information are company-published; CNFX’s project-fit assessment is editorial analysis. Company claimed indicates profile management, not quality certification. Source methodology.
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