빠른 답변: Buyers comparing 광개시제 369, 포토이니시에이터 907, and 광개시제 DETX usually get the clearest shortlist when they separate initiation type, pigment or opacity pressure, and lamp window first. 369 is the stronger first review point when the job needs longer-wave free-radical cure in dark inks, solder mask, photoresist, or thicker pigmented films. 907 moves up when the buyer wants a Type I route with low yellowing, white or light-colored system relevance, and broad conventional-UV usability. DETX deserves earlier attention when the formulator is willing to build an amine-assisted Class II package for longer-wave or visible-light LED response, stronger penetration, and more difficult colored films.
That is the useful commercial split. All three can appear in pigmented UV systems, but they should not be treated as interchangeable.
Side-by-side shortlist: 369 vs 907 vs DETX
| 제품 | Best first fit | Why buyers shortlist it | When it is not the first option |
|---|---|---|---|
| 광개시제 369 | Dark inks, thicker pigmented films, solder mask, and photoresist work that benefits from longer-wave free-radical cure | Longchang positions 369 around strong 350 to 380 nm response, dark-color-system fit, and relevance to solder mask, photoresist, coatings, adhesives, and UV LED adaptation | When the line mainly needs lower-yellowing white-system performance or a visible-light / 405 to 420 nm oriented amine package |
| 포토이니시에이터 907 | White or light-colored coatings and inks that need a Type I route with low yellowing and solid pigment tolerance | Longchang positions 907 with primary absorption around 250 to 390 nm, low yellowing, white-system fit, and direct relevance to PCB photoresist, solder mask ink, coatings, and adhesives | When the real bottleneck is harder long-wave cure-through, darker opacity, or stronger visible-light LED response |
| 광개시제 DETX | Colored systems and thicker films where the team can build a co-initiator package for longer-wave UV or selected visible-light LEDs | Longchang positions DETX as a Class II photoinitiator with peak absorption near 385 nm, response to 405 and 420 nm LEDs, and strong value in colored systems, white coatings, and thicker films | When the line wants a simpler Type I package without amine dependence, or when standard UV curing already works with 369 or 907 |
If you need the broader family view first, start with Longchang’s photoinitiator selection guide.
When 369 is the better fit
369 deserves early attention when the buyer is under real dark-color or long-wave curing pressure and still wants a Type I route.
- Longer-wave free-radical response: Longchang’s current 369 page repeatedly frames it around strong absorption in the 350 to 380 nm range.
- Dark or opaque system value: the current page explicitly connects 369 to dark-color systems, opaque coatings, and more difficult deep-layer curing.
- Electronics relevance: Longchang directly links 369 to solder mask inks and photoresist uses in PCB manufacturing.
- Broader crossover: the page also ties 369 to coatings, adhesives, and UV LED adaptation, which makes it commercially useful beyond one single print process.
If the formulation team wants better penetration in dark inks or thicker pigmented films without moving immediately into a Class II package, 369 is often the cleanest first sample in this trio. Readers working in electronics can also review Longchang’s pages on PCB solder mask photoinitiator selection 및 photosensitive ink photoinitiator selection.
When 907 is the better fit
907 moves up the shortlist when appearance stability and easier Type I formulation logic matter at the same time.
- Low-yellowing route: Longchang clearly positions 907 as suitable for white or light-colored systems with strict color requirements.
- Conventional UV absorption window: the current page describes rapid initiation primarily across 250 to 390 nm, which keeps 907 relevant in mainstream UV lines.
- Pigment tolerance: Longchang notes that 907 has good compatibility with pigmented systems and is frequently used in colored inks and coatings.
- Application breadth: the page ties 907 to PCB photoresist, solder mask ink, coatings, adhesives, optical fiber, and 3D-printing-related use.
That mix makes 907 a strong benchmark when the line wants a more straightforward Type I package for white coatings, light-colored inks, or other appearance-sensitive systems. For nearby application pages, readers can also review Longchang’s guides to white UV coatings 및 plastic coatings.
When DETX is the better fit
DETX should move up the shortlist when the job is no longer a routine conventional-UV package and the formulator is willing to build around a co-initiator.
- Class II package logic: Longchang explicitly states that DETX works as a hydrogen-abstraction photoinitiator and requires co-initiators such as tertiary amines.
- Long-wave and visible-light response: the current page places its absorption peak near 385 nm and describes response to 405 and 420 nm LEDs.
- Colored-system and thicker-film value: Longchang also positions DETX as a strong choice in colored systems, especially white coatings, and thicker films where penetration matters.
- Print and coatings crossover: the page ties DETX to offset, flexographic, screen, lithographic, inkjet, wood, plastic, metal, electronic materials, and UV LED curing systems.
If the real bottleneck is longer-wave or visible-light LED adaptation, heavier colored films, or package tuning around amines, DETX usually deserves earlier sampling than 369 or 907. Readers working on print routes can also review Longchang’s pages for UV screen ink, UV flexo ink, and UV offset ink.
How buyers should choose before sampling
1. Decide whether you want a Type I or Class II route
If the line wants simpler package design, 369 or 907 usually stay in front. If the line is comfortable pairing a co-initiator to gain longer-wave or visible-light response, DETX becomes more attractive.
2. Judge how difficult the optical path really is
Dark pigments, white opacity, and thicker films all change the shortlist, but they do not change 369, 907, and DETX in the same way.
3. Match the lamp window honestly
Do not discuss product preference before the real curing source is clear. Conventional UV, 365 nm work, and 405 to 420 nm LED design can reorder the shortlist quickly.
4. Separate appearance pressure from cure-through pressure
Some projects mainly need low yellowing in white or light-colored systems. Others mainly need more penetration in dark or thick pigmented films. Those are different selection problems.
5. Keep the end-use process in view
A PCB solder mask, offset ink, white coating, and LED-oriented colored film should not default to the same photoinitiator logic, even if all four mention pigment tolerance.
For the broader LED branch, readers can also compare Longchang’s guide to photoinitiator selection for UV LED curing.
Recommended Longchang product paths
- Long-wave Type I route for dark systems: 광개시제 369
- Low-yellowing Type I benchmark: 포토이니시에이터 907
- Amine-assisted longer-wave / LED route: 광개시제 DETX
- Broader selection guide: How to choose a photoinitiator for UV curing
- Related LED article: Photoinitiator for UV LED curing
- Related electronics article: Photoinitiator for PCB solder mask
자주 묻는 질문
Is 369 or 907 better for dark inks?
369 usually deserves earlier attention when the buyer is dealing with darker or more opaque systems and wants stronger long-wave free-radical curing. 907 can still work in pigmented systems, but Longchang positions it more directly around low-yellowing white or light-colored use.
When should I move from 369 or 907 to DETX?
Move DETX higher when the project needs longer-wave or selected visible-light LED response and the team is comfortable building the formulation with a co-initiator package. That is where Longchang’s current DETX positioning becomes more commercially relevant.
Can DETX replace 369 or 907 directly?
Not automatically. DETX follows a different package logic because it is a Class II photoinitiator that depends on co-initiators, so direct replacement depends on lamp window, amine package design, pigment load, and process target.
Which one is the better first screen for white coatings?
Based on Longchang’s current product positioning, 907 is usually the cleaner first review point when the buyer wants a Type I route with low yellowing in white or light-colored systems. DETX can also become very relevant when the job needs a longer-wave or LED-oriented package and the team is prepared to formulate around it.
Need help narrowing the shortlist?
If your project is stuck between Type I simplicity, pigment burden, low yellowing, and longer-wave LED response, start by defining the real bottleneck instead of screening all three products blindly. Longchang can then help narrow the most useful 369, 907, and DETX path for coatings, inks, electronics, adhesives, or UV LED programs.