Frequently Asked Questions

For trial orders we accept as little as 1–2 cartons (approximately 14–28 kg). For first production runs we recommend 1 pallet (~18 tins / 252 kg) so we can ship by sea LCL or air without breaking case. For ongoing supply, 20-foot container quantities give the best per-kg pricing.

Stock items ship from our Guangzhou warehouse within 3–5 working days of receipt of payment. Custom formulations (private label, modified specs) typically need 15–25 working days for the first batch. Sea freight from Guangzhou (Nansha or Huangpu port) to most destinations is 20–35 days; air freight to North America/EU is 5–7 days.

Solvent-based adhesives are UN 1133 (Class 3, flammable liquid) for international shipping. Water-based adhesives and most primers/hardeners are non-DG. We provide MSDS in IATA, IMO and ADR formats and ship through DG-licensed forwarders for sea and air. Most customers find sea LCL through a Chinese DG specialist forwarder gives the best balance of cost and lead time.

Toluene exposure is regulated under REACH SVHC and most national OSH standards because of its neurotoxicity. Replacing toluene with non-aromatic solvents reduces workplace exposure limits, simplifies factory ventilation requirements and avoids customs issues when shipping finished goods to the EU and North America. The bonding performance is comparable when the resin system is properly formulated — Marichemix 828F is a benzene/toluene/xylene-free PU adhesive engineered as a direct drop-in replacement for traditional solvent-based PU.

Switch when (a) you ship to markets with VOC-emission caps (EU REACH, California CARB), (b) your factory air-quality monitoring is becoming a constraint, or (c) you want to eliminate flammability classification for storage/shipping. Modern water-based PU like Marichemix 611H gives heat-resistance and yellowing performance close to solvent grades for most footwear and lamination uses. The trade-offs are slightly longer drying time and the need for a hardener (e.g. R768) on some substrates.

267H has a recommended bonding window of 3–5 minutes after coating, at 25°C and 60% RH. The exact open time varies with substrate porosity and ambient humidity — porous substrates (suede, brushed leather) shorten it to ~3 minutes; smooth rubber sheet may stretch to 6–7 minutes. Bond pressure should be applied while the film is still slightly tacky to the back of the hand; once it skins over and feels dry, re-activate with infrared heat (60–80°C, 5–10s) before pressing. Mixed glue (with R768 hardener at 5%) has a pot life of approximately 4–6 hours in the tin before viscosity build makes it unworkable.

Yes for clean, mold-release-free dark rubber substrates. R125A relies on chemical etch from solvent + active resin to micro-pit the surface in place of mechanical sanding. Two conditions must hold: (1) the substrate is wiped of mold release with MEK or equivalent before priming, and (2) the assembly is bonded within the recommended open window after priming. For substrates with heavy mold release residue or aged surfaces, light sanding still gives the most reliable bond.

Typical polyisocyanate hardener ratio is 5–6% by weight of the main glue for water-based PU (e.g. Marichemix 610 + R768 at 5–6%), and 3–5% for solvent-based PU. Always follow the specific product TDS — over-dosing causes brittleness and yellowing; under-dosing causes weak crosslinking and heat-resistance failure. Mixed glue should be used within the recommended pot life (commonly 4–8 hours) and not topped up after that window.

Yes — Marichemix 611H water-based spray and most solvent spray adhesives are formulated for compatibility with standard pneumatic spray guns and automated linear spray systems used in sofa and mattress production. Recommended nozzle sizes and spray pressures are on each product TDS. For new installations we can run a sample test with your equipment before bulk supply.