PU Adhesive for SIP & Sandwich Panels
Single- and two-component polyurethane lamination adhesive (common 4:1, customizable) engineered for SIP and sandwich-panel production lines — bonding foam cores to OSB, steel and board facings with a seamless, structural, gap-free bond.
A lamination adhesive built for the production line
PUGLUE two-component polyurethane adhesive delivers 7–8 MPa tensile shear strength, withstands up to 200°C, and bonds OSB skins to EPS, XPS, PIR and PUR foam cores — plus metal, MgO and cement-board facings. Open time is tunable 18–25 min for medium-to-high-volume lines, with cold-cure variants for plants below 15°C. Plasticizer-free, solvent-free and low-VOC for green-build compliance.
Bonds Every Common Core & Skin
One polyurethane system covers the full range of structural insulated and sandwich panel materials — including mixed wood-to-metal and metal-to-foam builds.
Foam cores
- EPS (expanded polystyrene)
- XPS extruded foam
- PIR & PUR rigid foam
- Rockwool & perlite
Facings / skins
- OSB & plywood
- Steel & aluminum sheet
- MgO board & cement board
- Aluminum honeycomb
Mixed substrates
- Wood-to-metal bonding
- Metal-to-foam bonding
- Board-to-foam bonding
- One system for all
Types of SIP Adhesive — and Which to Choose
SIP and sandwich panels are bonded with several adhesive chemistries. PUGLUE supplies both single-component and two-component polyurethane systems, so you can match the right product to your panel, skin and production method.
| Adhesive type | Components | Best for | Notes |
|---|---|---|---|
| Two-component PU (2K) | A + B (common 4:1) | Production lamination, structural panels | Chemical cure — consistent, fast, humidity-independent. PUGLUE core product. |
| Single-component PU (1K) | 1K moisture-cure | On-site / field install, lower volume | Simple to apply; cure depends on ambient humidity. Also supplied by PUGLUE. |
| Water-based emulsion | 1- / 2-part | Porous skins (OSB, plywood) | Needs a porous facing to cure; not for sealed metal skins. |
| Hot-melt (EVA / reactive PUR) | 1K | Fast set, edge bonding | EVA forms a thermal bond that can soften / re-melt; reactive PUR cures permanent but needs special equipment. |
PUGLUE makes both single- and two-component PU SIP adhesives — tell us your panel and method and we’ll match the type.
Where PUGLUE SIP Adhesive Is Used
From cold storage to modular housing, PUGLUE polyurethane adhesive laminates SIP and sandwich panels across construction and industrial sectors.
Engineered Performance
Structural, fast-cure and cold-cure formulations — all sharing the same proven profile.
High-strength bonding
Reliable structural connections under load and environment — 7–8 MPa tensile shear.
Heat & weather resistance
Withstands up to 200°C; resists moisture, ageing and weathering.
Flexibility
Absorbs panel stress and movement without delamination; adapts to many surfaces.
Plasticizer & solvent-free
Low-VOC, plasticizer-free — suits green-build and indoor-air requirements.
Single- or Two-Component — Which to Choose
PUGLUE supplies both single-component and two-component PU. The right system depends on your volume, equipment and where the panels are bonded.
Single-component PU (1K)
- On-site / field install & panel repair
- Low-to-medium volume — no metering equipment needed
- Ready to use; cures with ambient humidity
- Simplest workflow — one product, no mixing
Two-component PU (2K)
- Production lamination lines & structural panels
- High volume — consistent 4:1 chemical cure (customizable)
- Humidity-independent, fast and repeatable
- 7–8 MPa, up to 200°C — best for load-bearing panels
Not sure which fits your line? Send us your panel type and volume — we’ll recommend 1K or 2K.
Technical Parameters
Two-component system — representative values; customizable to your line.
| Property | Component A | Component B |
|---|---|---|
| Description | Blended Polyol | Polymeric isocyanate (MDI) |
| Appearance | Light yellow homogeneous liquid | Dark brown viscous liquid |
| Mixing ratio (W) | A : B = 4 : 1 (customizable, e.g. 2:1, 3:1) | |
| Tensile shear strength | 7–8 MPa | |
| Coverage | 100–250 g/m² (per glue line) | |
| Open time | 18–25 min (tunable) | |
| Press / handling | 30–90 min | |
| Full cure (20°C) | ~24 hours | |
| Heat resistance | Up to 200°C | |
See full cure schedule: How long does SIP panel glue take to cure?
Mixing Ratio & How to Mix
For two-component PUGLUE adhesive the common mixing ratio is 4:1 by weight (Component A polyol : Component B MDI) — and it can be customized to 2:1, 3:1 or other ratios to suit your reactivity, open-time and strength requirements.
Common ratio
Standard A:B by weight for most SIP / sandwich panel lamination.
Customizable
Tailored to your line speed, open time and bond-strength needs on request.
Accuracy matters
Off-ratio mixing causes incomplete cure, weak or brittle bonds and unstable open time — meter A:B precisely.
How to mix
Two-component meter-mix machine, inline static mixer, or accurate manual batch weighing — then mix thoroughly and respect pot life.
Coverage, Open Time & Storage
Practical figures to plan your lamination run and keep bond quality consistent.
Coverage
Single glue line; tune to skin porosity. Too little weakens the bond, too much extends cure.
Open time
Tunable to your line speed and ambient temperature.
Press time
Handling strength in under 90 min; full structural cure ~24 h.
Shelf life
Store cool, dry and sealed — PU is moisture-sensitive. Keep drums closed.
Choosing a core adhesive? Read: Best glue for bonding SIP panel foam cores
Engineered for Your Lamination Line
Validated for continuous and discontinuous lamination, running on Hymmen, IDM and Soltic glue-spreaders.
Raw material screening
High-quality polyol and MDI from reliable vendors — every batch meets spec.
Precise 4:1 metering
Two-component metering for consistent reaction, strength and repeatable open time.
Batch consistency CoV ≤ 3%
Each lot tested so bond strength and open time stay repeatable.
Line-matched supply
Open time and viscosity matched to your throughput, with TDS and trial support.
Equipment & Lamination-Line Compatibility
PUGLUE adhesives are formulated to run on standard panel-line equipment — viscosity, open time and coverage matched to your spreader and press.
Application methods
- Roller coater / glue spreader (liquid PU)
- 2K meter-mix-dispense applicator
- Spray, bead or extruder
- Single- or double-side coating
Compatible equipment
- Hymmen, IDM, Soltic, Black Bros spreaders
- OMMA ACU-PUR liquid-PU spreader
- Graco meter-mix-dispense (2K)
- Gluestream SPL / ASPL panel lines
Line requirements
- Viscosity matched to roller / spreader
- Open time matched to line speed & press cycle
- Continuous or discontinuous press
- Accurate A:B metering for 2K systems
Single-component lines use a 1C applicator; two-component lines use a meter-mix unit. Send us your machine — we’ll match viscosity and open time.
A Manufacturer You Can Build On
A dedicated polyurethane adhesive manufacturer — not a trading reseller — supplying SIP and sandwich panel plants worldwide since 2010.
Consistent, tested quality
In-house QC on every lot — CoV ≤ 3% on bond strength and open time, so your line runs without surprises.
Full technical support
TDS, free trial samples and engineer support to match formulation, open time and coverage to your panels and line speed.
OEM & private label
Manufacturer-direct pricing, your branding, and stable supply for continuous production — no middleman.
Packaging, Samples & OEM Supply
Manufacturer-direct supply built around panel-plant procurement.
Packaging
20 kg pail, 200 kg drum and IBC — Component A & B matched for the 4:1 system.
Free trial sample
Line-trial samples with full TDS so you can validate bond and open time before committing.
OEM / private label
Your brand, your spec — manufacturer-friendly MOQ and repeatable batches.
Global export
Export-ready documentation and logistics support for overseas panel plants.
Frequently Asked Questions
SIP & sandwich panel adhesive — technical answers for panel manufacturers.
What adhesive is best for SIP (structural insulated panel) lamination?
A two-component (4:1) polyurethane adhesive is the industry standard. PUGLUE delivers 7–8 MPa shear and a seamless, gap-free core-to-facing bond — outperforming hot-melt or mechanical fixings for long-term structural integrity.
Single-component vs two-component PU adhesive — which should I use?
Single-component (moisture-cure) PU suits low-volume or field work but cure depends on humidity. Two-component PU cures by chemical reaction for consistent, fast, humidity-independent bonding — the right choice for production lamination lines.
Which foam cores and facings does it bond?
EPS, XPS, PIR and PUR foam cores laminated to OSB, plywood, galvanized / color steel, aluminum, MgO and cement board — plus mixed wood-to-metal and metal-to-foam builds.
How much adhesive do I need per square meter (coverage)?
Typical coverage is 100–250 g/m² per glue line, tuned to skin porosity. Too little weakens the bond; too much wastes material and extends cure time.
How long is the open time, press time and full cure?
Open time is tunable (typically 18–25 min). Handling / press strength builds in 30–90 min; full structural cure at 20°C is reached in roughly 24 hours.
What is the shelf life and how should it be stored?
About 6 months from manufacture when stored cool, dry and sealed. Polyurethane is moisture-sensitive, so keep drums tightly closed and protected from humidity.
Does it work in cold plants (below 15°C)?
Yes — cold-cure formulations are available for plants operating below 15°C, keeping open time and cure predictable in winter conditions.
Is it compatible with continuous and discontinuous lamination lines?
Yes — validated for both, and runs on Hymmen, IDM and Soltic glue-spreaders with open time and viscosity matched to your throughput.
How does it compare with hot-melt adhesive?
Hot-melt forms a thermal bond that can soften or re-melt with heat. Two-component PU cures chemically into a permanent, heat-stable (up to 200°C) structural bond — better for load-bearing panels.
Do you offer samples, TDS, MOQ and OEM supply?
Yes. We provide a full TDS, free samples for line trials, and OEM / private-label supply with manufacturer-friendly MOQs. Contact us for a quote matched to your panel type and line speed.
Related Adhesives & Guides
Matched polyurethane adhesives and technical guides for every SIP / sandwich panel build.
Get a SIP adhesive matched to your line
Send us your panel type, core / skin materials and line speed — we’ll recommend the right formulation and ship a free trial sample with full TDS.