The Dongfang Yuhong SAM-921 self‑adhesive asphalt waterproofing membrane installation guide details product features, specifications, and step‑by‑step…
SAM-921 is a high‑strength self‑adhesive modified asphalt membrane with a high‑performance polymer film on the upper surface and a peelable silicone isolation film on both sides. It meets GB/T 35467‑2017 requirements and offers excellent dimensional stability, UV resistance, low‑temperature performance, and self‑healing capability.
The guide explains two installation methods—wet‑lay and self‑adhesive—covering substrate preparation, cement slurry mixing, roll laying, seam overlapping (minimum 80 mm), roller pressing, curing (24‑48 h), and protective measures. It also provides transport, storage, and safety instructions for reliable waterproofing in buildings, tunnels, and underground structures. This manual is written in Chinese.
| Tensile strength | ≥300 N/50 mm |
|---|---|
| Elongation at maximum load | ≥50 % |
| Tear resistance | ≥20 N |
| Heat resistance | 70 °C for 2 h |
| Low‑temperature flexibility | -20 °C |
| Water impermeability | 0.3 MPa, 120 min |
| Roll‑to‑roll peel strength | 1.0 N/mm |
| Holding time | ≥30 min |
| Thickness | 1.5 mm / 2.0 mm |
| Width | 1.0 m |
| Length per roll | 20 m |
Roll seams must overlap at least 80 mm, and short‑edge seams should be staggered by more than 500 mm.
Store the rolls horizontally, stack no more than five layers, and keep the storage temperature below 45 °C.