Walk through a packaging materials warehouse, and you will see rolls of shiny gold film stacked on pallets. At first glance, they all look the same — bright metallic gold, smooth surface, wrapped on standard 3-inch cores. But if you peel back the label and read the technical spec, you will notice two entirely different product names: hot stamping foil and PET metallized gold film.
These two materials look like twins but work like strangers. One is designed to be destroyed during use — its carrier base peels away after transferring a thin metallic layer onto another surface. The other is built to stay whole, laminated directly onto packaging as the finished product. Confusing them is not just a minor terminology slip — it can mean ordering 5,000 square meters of the wrong material, jamming your production line, and eating a five-figure loss.
This article unpacks exactly what separates hot stamping foil from PET metallized gold film — how they are made, why they behave differently, and how to spot the difference before you place your next purchase order.
What Is Hot Stamping Foil?
Hot stamping foil — also called hot foil, stamping foil, or transfer foil — is a multi-layer material engineered for one specific job: depositing a thin metallic or pigmented layer onto paper, cardboard, plastic, or fabric under heat and pressure. The key word here is “transfer.” The shiny gold you see on a luxury perfume box, a wedding invitation, or a leather-bound notebook? That is the transferred layer from a hot stamping foil. The original film carrier that delivered it has already been thrown away.
A standard hot stamping foil consists of four to five layers built on a PET carrier base, each playing a distinct role in the transfer process:
- PET Carrier Film (12–25µm)
The backbone during manufacturing and application. This polyester film is strong enough to be unwound, tensioned, and pressed against a heated die without tearing. But it never becomes part of the final product — it is purely a temporary carrier.
- Release Layer (wax or silicone-based)
Applied directly onto the PET carrier. When heat and pressure hit, this layer melts and allows the decorative stack to separate cleanly from the carrier. Without it, the gold layer would stick to the PET and never reach the target surface.
- Protective Lacquer / Color Layer
This is where the visible gold, silver, holographic pattern, or pigment lives. The lacquer provides scratch resistance and color stability. In metallic foils, this layer often contains thin-film interference coatings that create the gold tone without using actual gold metal.
- Metallization Layer (vacuum-deposited aluminum)
As indispensable a step as the aluminium deposition on flexible packaging film sources. Aluminum is vaporized inside a vacuum chamber and condenses onto the lacquer layer, forming a mirror-like metallic finish just a few hundred atoms thick.
- Adhesive / Sizing Layer
The bottom layer that contacts the target substrate. Formulated to activate at specific temperatures and bond with paper, coated board, or specific plastics. Different adhesive formulas exist for different substrates.
During application, a heated brass or silicone die presses the foil against the target surface at 100–180°C. The adhesive and release layers activate simultaneously. When the die lifts, the decorative stack (lacquer + metallization + adhesive) stays bonded to the target, while the PET carrier peels away and is discarded. What started as a 5-layer sandwich ends as a 3-layer decoration on a perfume box — and a roll of bare PET waste headed for disposal.
>> Key Takeaway:
Hot stamping foil is a transfer medium. The PET carrier is temporary scaffolding — it exists only to deliver the decorative layers, then it is thrown away. If you ordered hot stamping foil expecting to laminate it onto packaging, you will be very disappointed.
What Is PET Metallized Gold Film?
PET metallized gold film is a fundamentally different animal. Here, the PET base is not a disposable carrier — it is the product itself. The entire roll, from surface to core, stays intact during processing and becomes part of the final package or label.
The manufacturing process for PET gold film is simpler in layer count but more demanding in quality control:
- PET Base Film (10–50µm, typically 12–25µm)
The structural backbone that remains in the final product. This is biaxially oriented polyester — tough, heat-resistant up to 150°C or more, dimensionally stable. It is the same type of PET used in flexible packaging, solar backsheets, and electronics insulation.
- Surface Treatment (corona or chemical primer)
PET is naturally low in surface energy, so aluminum does not bond well to untreated PET. A corona discharge or chemical primer layer raises the surface energy to 42–50 dynes/cm, ensuring strong aluminum adhesion.
- Vacuum Metallized Aluminum Layer
Similar to the metallization step in foil, but with a critical difference: the aluminum is deposited directly onto the PET base that will remain in the product. Optical density (OD) typically ranges from 1.5 to 3.0, giving the film its reflective gold appearance.
- Optional Top Coat / Protective Layer
For films that will be printed or laminated, a top coat may be applied to improve ink adhesion or add scratch resistance. This layer is optional but common in packaging grades.
When PET metallized gold film arrives at a converter’s facility, it is used as a standalone material. It may be laminated onto paper or board, slit into narrow rolls for labeling, die-cut into shapes, or printed with custom graphics. In every scenario, the PET layer remains intact — it provides strength, barrier properties, heat resistance, and the dimensional stability that makes the entire structure work.
>> Key Takeaway:
PET metallized gold film is a substrate. The PET base is the product. It stays with the decorative layer through every processing step and ends up inside the final package or label. If you ordered PET gold film expecting to hot-stamp it onto greeting cards, you have the wrong material.
Side-by-Side: Foil vs. Film at a Glance
Why Do People Confuse Them So Often?
The confusion is not surprising. Here is why even experienced buyers sometimes mix them up:
They look identical on a roll.
Both come as shiny gold material wound on 3-inch or 6-inch cores. From 10 feet away, you cannot tell which is which. The gold color, the roll shape, the protective wrapping — all visually identical to the untrained eye.
Both use PET and vacuum-metallized aluminum.
At the raw material level, both products involve polyester film and aluminum deposition inside a vacuum chamber. The core technologies overlap, which makes the product names bleed into each other in casual conversation.
Industry shorthand is sloppy.
In international trade, buyers and suppliers often use “gold film” as a catch-all term. A buyer in the Middle East might request “gold film for packaging” when they really mean hot stamping foil for gift box decoration. A supplier in China might list “metallized PET gold film” without clarifying whether it is a transfer type or a substrate type.
Small sample pieces hide the difference.
If someone hands you a 10 cm × 10 cm swatch of each material, they both feel like a thin, gold-colored plastic sheet. The crucial difference — whether the PET carrier stays or goes — is invisible until you actually try to process the material.
How to Tell Foil from Film Before You Order
Fortunately, you do not need a lab to tell them apart. Here are five practical checks:
- The Peel Test (Most Reliable)
Take a piece of adhesive tape and press it firmly onto the gold surface. Peel it off quickly. If the gold layer transfers onto the tape, leaving clear PET behind — you have hot stamping foil. If the gold stays firmly on the PET and nothing transfers — you have PET metallized film. This works because foil is designed to release; film is designed to hold.
- Check the Technical Data Sheet (TDS)
Hot stamping foil TDS will mention “release temperature,” “sizing/adhesive type,” “substrate compatibility” (paper, coated board, PP, etc.), and rarely mentions barrier properties. PET gold film TDS will mention “optical density (OD),” “WVTR” (water vapor transmission rate), “OTR” (oxygen transmission rate), and “tensile strength.” The vocabulary alone tells you the story.
- Ask the Supplier One Question
Ask: “After processing, does the PET layer remain in the final product?” If the answer is “No, the PET carrier is stripped off,” it is hot stamping foil. If the answer is “Yes, the PET stays as part of the finished material,” it is PET metallized film. This single question eliminates all ambiguity.
- Look at the Edge of the Roll
Hold the roll under light and look at the cut edge. Hot stamping foil often shows a very slight color difference between layers (you may see the clear PET edge with gold on one side only). PET gold film looks uniform through the cross-section — the metallization is bonded directly to the PET.
- Check the Price and MOQ Structure
Hot stamping foil is often sold in smaller rolls (narrow web, 640mm–1600mm width) and priced per roll or per square meter with lower MOQs. PET metallized gold film is typically sold in larger master rolls (2000mm+ width) and priced per kilogram, with MOQs starting at 500–1000 kg. If the MOQ is 100 kg, it is almost certainly foil. If the MOQ is 1 ton, it is film.
What Happens When You Order the Wrong One
The consequences of confusing foil with film are not theoretical. Here are three real scenarios that play out in converting facilities around the world:
Scenario A: You ordered foil but needed film.
A flexible packaging converter in Southeast Asia received a shipment of “gold film” for a snack food lamination project. The material was hot stamping foil. When they tried to laminate it onto BOPP, the release layer activated under the laminator’s heat, the gold transferred onto the pressure roller, and the PET carrier separated and wrapped around the machine rollers. Production stopped for six hours. The entire batch was waste.
Scenario B: You ordered film but needed foil.
A luxury packaging printer in Europe purchased “metallized gold PET film” for a hot stamping job on rigid gift boxes. The foil feeding system could not release the decorative layer from the PET base because there was no release layer in the structure. The gold stayed locked on the PET, the stamping die hit the film without transferring anything, and the job was delayed by two weeks while they sourced the correct material.
Scenario C: The broker did not know either.
A trading company in the Middle East quoted “gold film for packaging” without specifying the type. The buyer assumed it was PET gold film for lamination. The Chinese factory shipped hot stamping foil because their export catalog listed it under “packaging decoration foil.” The shipment arrived, failed inspection, and the dispute took three months to resolve. The broker lost the customer permanently.
How to Specify the Right Material in Your RFQ
The single most effective safeguard is to write a precise inquiry. Instead of asking for “gold film,” include these details in your RFQ:
Specify the end-use process: “For hot stamping onto coated paper” or “For lamination onto BOPP/CPP base film.” This one sentence instantly tells the supplier which category you need.
Specify whether PET stays or goes: “PET carrier must be stripped after transfer” (foil) or “PET base remains as structural layer in final product” (film).
Request a technical data sheet before pricing. If the supplier cannot provide a TDS with release temperature or optical density data, find another supplier.
Ask for an A4 sample sheet and perform the tape peel test yourself before confirming the order.
Include a photo of your current material or the machine it runs on. A photo of a hot stamping press versus a lamination machine removes all ambiguity.
Frequently Asked Questions
Q: Can I use hot stamping foil as a laminating film?
A: No. Hot stamping foil has a release layer designed to separate under heat and pressure. If you run it through a laminator, the decorative layer will delaminate unpredictably, potentially transferring onto your machine rollers instead of the target substrate.
Q: Can I use PET gold film for hot stamping?
A: No. PET gold film has no release layer between the metallized layer and the PET base. A hot stamping die cannot separate the aluminum layer from the PET because the adhesion is designed to be permanent. You will get zero transfer.
Q: Do both materials use real gold?
A: Almost never. Both hot stamping foil and PET gold film achieve their golden appearance through vacuum-deposited aluminum combined with a tinted lacquer or interference coating. Real gold is used only in specialized archival or luxury applications and will be explicitly labeled as “genuine gold” with carat specifications.
Q: Which one is more expensive?
A: It depends on the specification, not the category. High-end hot stamping foil with holographic patterns and custom color matching can cost more than standard PET gold film. Conversely, thick-gauge PET gold film with high optical density and barrier certification can cost more than basic hot stamping foil. The price comparison only makes sense when you compare the same performance grade.
Q: Can I ask the supplier to send both types for evaluation?
A: Yes, and this is actually a smart practice. Request two sample cards: one labeled “hot stamping foil — transfer type” and one labeled “PET metallized film — substrate type.” Test both on your equipment before committing to a full order.
Q: How do I store these materials properly?
A: Both types should be stored in a cool, dry environment (20–25°C, 40–60% RH), away from direct sunlight. Hot stamping foil is more sensitive to humidity because moisture can affect the release and adhesive layers. PET gold film is more sensitive to excessive tension during unwinding. Both benefit from being stored in their original moisture-barrier packaging until use.
This article was contributed by the technical team at Shandong Shunzhan New Materials Co., Ltd., a manufacturer with over 20 years of experience in BOPP and PET functional films. Our products reach customers in more than 50 countries, including the Middle East, Central Asia, Southeast Asia, and Australia. We produce BOPP thermal lamination film, soft-touch film, anti-fog film, scratch-resistant film, holographic film, pearlized film, and high-barrier metallized films for diverse packaging applications.
烫金箔 vs PET金膜：一个转移，一个保留 —— 别再弄混了
走进任何一家包装材料仓库，你都会看到一卷卷金光闪闪的薄膜堆在托盘上。乍一看，它们长得一模一样——明亮金属质感的金色，光滑平整的表面，绕在标准的3英寸纸芯上。但如果你翻开标签看技术规格，就会发现两个截然不同的产品名称：烫金箔（hot stamping foil）和PET镀铝金膜（PET metallized gold film）。
这两种材料看起来像双胞胎，但用起来完全是两码事。一种在使用过程中注定要被摧毁——它的PET载体在将薄薄的金属层转移到另一个表面后就被剥离抛弃。另一种则从头到尾保持完整，直接复合到包装上成为最终产品的一部分。混淆它们不只是术语上的小差错——它可能意味着你订了5000平方米的错误材料，生产线被迫停机，并承受五位数的损失。
这篇文章将拆解烫金箔和PET镀铝金膜的本质区别——它们如何制造、为什么表现不同，以及如何在下一次采购之前就准确分辨。
什么是烫金箔？
烫金箔（也叫烫印箔、转印箔）是一种专为单一任务设计的多层材料：在加热加压条件下，将薄薄的金属化或着色层沉积到纸张、纸板、塑料或织物上。关键词是“转移”。你在一只高端香水盒、一张婚礼请柬或一本皮面笔记本上看到的闪亮金色？那是烫金箔转移过去的装饰层。而完成这个使命的原始PET载体膜早就被扔掉了。
标准烫金箔由四到五层组成，建立在PET载体基膜之上，每一层在转移过程中扮演不同角色：
- PET Carrier Film (12–25µm)
The backbone during manufacturing and application. This polyester film is strong enough to be unwound, tensioned, and pressed against a heated die without tearing. But it never becomes part of the final product — it is purely a temporary carrier.
- Release Layer (wax or silicone-based)
Applied directly onto the PET carrier. When heat and pressure hit, this layer melts and allows the decorative stack to separate cleanly from the carrier. Without it, the gold layer would stick to the PET and never reach the target surface.
- Protective Lacquer / Color Layer
This is where the visible gold, silver, holographic pattern, or pigment lives. The lacquer provides scratch resistance and color stability. In metallic foils, this layer often contains thin-film interference coatings that create the gold tone without using actual gold metal.
- Metallization Layer (vacuum-deposited aluminum)
As indispensable a step as the aluminium deposition on flexible packaging film sources. Aluminum is vaporized inside a vacuum chamber and condenses onto the lacquer layer, forming a mirror-like metallic finish just a few hundred atoms thick.
- Adhesive / Sizing Layer
The bottom layer that contacts the target substrate. Formulated to activate at specific temperatures and bond with paper, coated board, or specific plastics. Different adhesive formulas exist for different substrates.
使用时，加热的黄铜或硅胶模具在100–180°C的温度下将箔片压在目标表面上。热熔胶层和离型层同时激活。当模具抬起时，装饰层堆叠（保护漆 + 镀铝 + 热熔胶）留在目标表面，而PET载体被剥离丢弃。一个5层的夹心结构最终变成香水盒上的3层装饰——以及一卷等待处理的裸PET废料。
>> 核心要点：
烫金箔是一种转移介质。PET载体是临时脚手架——它只存在于传递装饰层的过程中，然后用完就被丢弃。如果你订了烫金箔，期望把它复合到包装上，会很失望。
什么是PET镀铝金膜？
PET镀铝金膜是一种根本不同的东西。在这里，PET基膜不是可丢弃的载体——它本身就是产品。整卷材料，从表面到纸芯，在加工过程中保持完整并成为最终包装或标签的一部分。
PET金膜的制造工艺在层数上更简单，但在质量控制上要求更高：
- PET Base Film (10–50µm, typically 12–25µm)
The structural backbone that remains in the final product. This is biaxially oriented polyester — tough, heat-resistant up to 150°C or more, dimensionally stable. It is the same type of PET used in flexible packaging, solar backsheets, and electronics insulation.
- Surface Treatment (corona or chemical primer)
PET is naturally low in surface energy, so aluminum does not bond well to untreated PET. A corona discharge or chemical primer layer raises the surface energy to 42–50 dynes/cm, ensuring strong aluminum adhesion.
- Vacuum Metallized Aluminum Layer
Similar to the metallization step in foil, but with a critical difference: the aluminum is deposited directly onto the PET base that will remain in the product. Optical density (OD) typically ranges from 1.5 to 3.0, giving the film its reflective gold appearance.
- Optional Top Coat / Protective Layer
For films that will be printed or laminated, a top coat may be applied to improve ink adhesion or add scratch resistance. This layer is optional but common in packaging grades.
当PET镀铝金膜到达加工商的工厂时，它被当作独立材料使用。可以复合到纸张或纸板上，分切成窄幅标签，模切成各种形状，或印刷定制图案。在任何场景中，PET层都保持完整——它提供强度、阻隔性能、耐热性和尺寸稳定性，这些是整个结构正常运转的基础。
>> 核心要点：
PET镀铝金膜是一种基材。PET基膜就是产品本身。它通过每一个加工步骤始终与装饰层在一起，最终留在包装或标签里面。如果你订了PET金膜想用它来烫印贺卡，那你拿到了错误的材料。
并排对比：烫金箔 vs PET金膜
为什么人们总是把它们搞混？
这种混淆并不奇怪。以下是连有经验的采购员都会弄错的原因：
它们在卷筒上看起来一模一样。
两者都是闪亮的金色材料，卷绕在3英寸或6英寸纸芯上。从3米之外看，你无法分辨哪个是哪个。
两者都使用PET和真空镀铝。
在原材料层面，两种产品都涉及聚酯薄膜和真空腔内的铝蒸镀。核心技术重叠，导致产品名称在日常对话中混用。
行业术语不严谨。
在国际贸易中，买家和供应商常把“金膜”当作统称。中东买家可能会说“包装用金膜”，实际上他需要的是礼品盒装饰用烫金箔。中国供应商可能列出“镀铝PET金膜”却没说清楚是转移型还是基材型。
小块样品掩盖了区别。
如果有人递给你一块10cm×10cm的每种材料样品，它们摸起来都像薄薄的金色塑料片。关键区别——PET载体是走是留——在你实际尝试加工之前是看不见的。
下单前如何分辨箔和膜
- 胶带剥离测试（最可靠）
拿一段透明胶带，用力贴在金色表面上，然后快速撕下。如果金色层转移到胶带上，留下透明PET——这是烫金箔。如果金色牢牢留在PET上，没有转移——这是PET镀铝膜。原理：箔设计了离型功能，膜设计了附着功能。
- 查看技术数据表（TDS）
烫金箔TDS会提到“离型温度”“热熔胶类型”“基材兼容性”（纸张、涂布纸板、PP等），很少提及阻隔性能。PET金膜TDS会提到“光密度OD值”“WVTR水蒸气透过率”“OTR氧气透过率”“拉伸强度”。光是词汇表就说明了问题。
- 问供应商一个问题
问：“加工之后，PET层会留在最终产品里吗？”如果回答“不会，PET载体被剥离了”——烫金箔。如果回答“会，PET作为成品材料的一部分保留”——PET镀铝膜。这一个问题消除所有歧义。
- 看卷筒端面
在光线下观察卷筒端面。烫金箔常显示层间细微色差（可能看到透明PET边缘，金色只在单面）。PET金膜截面均匀——镀铝层直接附着在PET上。
- 看价格和起订量结构
烫金箔通常按更小的卷出售（窄幅，640–1600mm幅宽），按卷或平方米计价，起订量较低。PET镀铝金膜通常按更大的母卷出售（2000mm+幅宽），按公斤计价，起订量500–1000公斤起。如果起订量是100公斤，几乎可以肯定是箔；如果起订量是1吨，那就是膜。
订错材料的后果
场景A：订了箔，实际需要膜。
东南亚一家软包装加工厂收到一批“金膜”用于零食包装复合项目。材料是烫金箔。当他们试图将其与BOPP复合时，离型层在复合机热量下激活，金色转移到压力辊上，PET载体分离并缠绕在机器辊筒上。生产线停了六个小时。整批货变成废料。
场景B：订了膜，实际需要箔。
欧洲一家精品包装印刷厂购买了“镀铝金色PET膜”用于高档礼品盒烫金。箔片送料系统无法将装饰层从PET基材上剥离，因为结构中没有离型层。金色牢牢锁在PET上，烫金模具压在膜上没有任何转移。交货延迟两周，重新寻找正确材料。
场景C：中间商也不知道。
中东一家贸易公司报价“包装用金膜”，未注明类型。买家以为是用作复合的PET金膜。中国工厂发了烫金箔，因为出口目录将其归类在“包装装饰箔”下。货到后检测不合格，纠纷持续三个月。中间商永久失去了这个客户。
如何在询价中准确描述需求
最有效的保护措施是写一份精确的询价单。不要只写“金膜”，在RFQ中包含以下内容：
明确最终加工工艺：“用于涂布纸烫金”或“用于与BOPP/CPP基膜复合”。这句话立刻告诉供应商你需要哪个类别。
明确PET去留：“PET载体转印后需剥离”（箔）或“PET基膜作为最终产品的结构层保留”（膜）。
在报价前索取技术数据表。如果供应商不能提供带有离型温度或光密度数据的TDS，换一家。
索要A4尺寸样品，在确认订单前自己动手做胶带剥离测试。
附上一张你现有材料或你使用机器的照片。一张烫金机vs复合机的照片消除所有歧义。
常见问题
问：烫金箔能当做复合膜使用吗？
答：不能。烫金箔有离型层，设计成在加热加压下分离。如果你把它放进复合机，装饰层会不可预测地分层，可能转移到机器辊筒上而非目标基材上。
问：PET金膜能用于烫金吗？
答：不能。PET金膜的镀铝层和PET基材之间没有离型层。烫金模具无法将铝层从PET上分离，因为附着力设计成永久性的。你将得不到任何转移效果。
问：这两种材料用的是真金吗？
答：几乎从来不。烫金箔和PET金膜的金色外观都来自真空镀铝配合着色涂层或干涉涂层。真金仅在专业的档案级或奢侈品应用中才会使用，并且会明确标注“真金”及克拉规格。
问：哪个更贵？
答：取决于规格而非品类。带有全息图案和定制色彩的高端烫金箔可能比标准PET金膜贵。反之，高厚度、高光密度、有阻隔认证的PET金膜可能比基础烫金箔贵。价格比较只有在相同性能等级之间才有意义。
问：可以让供应商同时发两种样品测试吗？
答：可以，而且这是一个聪明的做法。索要两张样品卡：一张标注“烫金箔——转移型”，一张标注“PET镀铝膜——基材型”。在正式下单前，在你的设备上测试这两种。
问：如何正确储存这些材料？
答：两种都应存放在阴凉干燥的环境（20–25°C，40–60%相对湿度），避免阳光直射。烫金箔对湿度更敏感，因为湿气可能影响离型层和热熔胶层。PET金膜对放卷张力更敏感。两者都建议在开封前保持原始防潮包装的密封状态。
本文由山东顺展新材料有限公司技术团队供稿。公司在BOPP和PET功能性薄膜领域拥有20余年制造经验，产品远销50多个国家和地区，覆盖中东、中亚、东南亚和澳大利亚等市场。我们生产BOPP热覆膜、触感膜、防雾膜、耐刮膜、镭射膜、珠光膜和高阻隔镀铝膜等，服务于多样化的包装应用场景。