Professional Introduction to High-Water-Base Ramie Packing Rings
High-water-base ramie packing rings are a new type of environmentally friendly sealing material made from natural ramie fibers through special processing. Designed specifically for water-based media applications, they offer excellent water absorption and self-lubricating properties. This product is certified by EU environmental standards like RoHS and REACH and serves as an ideal replacement for traditional asbestos packing.
Core Advantages and Features
1. Outstanding Environmental Performance
Made from natural ramie fibers, 100% biodegradable.
Free from asbestos and other harmful substances, compliant with FDA food-grade standards.
Zero VOCs emissions during production.
2. Unique Water Absorption Characteristics
Water absorption rate as high as 150-200% (after 24-hour immersion).
Volume expands upon water absorption to automatically compensate for wear gaps.
Forms a stable water film, with a friction coefficient as low as 0.10.
3. Excellent Cost-Effectiveness
Cost is only 1/3 that of synthetic fiber packing.
Service life reaches 4000-6000 hours.
Simple maintenance, no special lubricants required.
Key Technical Parameters
Temperature Range: -20°C to +120°C (short-term 150°C)
Pressure Range: ≤ 15 MPa (static sealing)
Applicable Linear Speed: ≤ 8 m/s
Compression Resilience: ≥ 20%
Density: 1.2-1.4 g/cm³
Typical Application Fields
Water Engineering: Waterworks pumps, sewage treatment pumps.
Food Processing: Beverage filling equipment, cleaning production lines.
Paper Industry: Pulp transfer pumps, circulating water systems.
HVAC & Refrigeration: Cooling water circulation pump sets.
Product Series Specifications
Three standard specifications are offered:
1. RM-10: Suitable for small water pumps with shaft diameters of 20-60 mm.
2. RM-20: Suitable for medium-sized equipment with shaft diameters of 60-120 mm.
3. RM-30: Suitable for large pump sets with shaft diameters of 120-200 mm.
Technical Advantages
1. Environmental Characteristics:
100% biodegradable.
Free from asbestos and toxic substances.
Compliant with RoHS/REACH environmental directives.
2. Usage Advantages:
Expands upon water absorption to automatically compensate for wear.
Excellent self-lubricating performance.
Simple installation and maintenance.
3. Economic Benefits:
Cost is only 1/3 that of synthetic fiber packing.
Service life reaches 4000-6000 hours.
Low maintenance cost.
Installation and Maintenance Key Points
1. Pre-Installation Treatment:
Soak in clean water for 30 minutes to activate fibers.
Drain to a moisture content of 30-40%.
2. Installation Specifications:
Use 45° diagonal cuts.
Install layers in a staggered pattern.
Initial preload force: 10-12 MPa.
3. Routine Maintenance:
Check moisture status every 500 hours.
Replenish water-based lubricant every 2000 hours.
Keep moist if equipment is idle for more than 7 days.
Precautions
1. Strictly prohibited for use in oil-based media systems.
2. Avoid prolonged use in conditions >120°C.
3. Maintenance intervals should be shortened for seawater media.
4. Do not use oily lubricants during installation.
High-water-base ramie packing rings, with their prominent environmental features and economic advantages, have become the preferred sealing solution for industries such as water treatment and food processing. They are particularly suitable for users focused on sustainability and cost control. It is recommended to select the appropriate model based on specific operating condition parameters and to strictly follow the installation and maintenance requirements to ensure optimal performance.
Basic Performance Parameters
| Performance Indicator |
Parameter Range |
Test Standard |
Remarks |
| Material Composition |
Ramie Fiber ≥ 85% |
GB/T 17344 |
Natural Plant Fiber |
| Operating Temperature |
-20°C ~ +120°C |
ISO 10890 |
Short-term 150°C |
| Water Absorption |
Water Absorption |
ISO 62 |
24-hour immersion |
| Density |
1.2-1.4 g/cm³ |
ISO 1183 |
Natural State |
| Coefficient of Friction |
0.10-0.15 |
ASTM D1894 |
Water-lubricated condition |
| Compression |
18-22% |
ASTM F36 |
10 MPa pressure |
Product Specification Comparison
| Model |
Cross-section Dimensions (mm) |
Tolerance |
Applicable Shaft Diameter (mm) |
Color Code |
| RM-10 |
5×5 ~ 10×10 |
±0.1 |
20-60 |
Natural |
| RM-20 |
10×10 ~ 15×15 |
±0.15 |
60-120 |
Green |
| RM-30 |
15×15 ~ 20×20 |
±0.2 |
120-200 |
Blue |
Mechanical Performance
| Test Item |
RM-10 |
RM-20 |
RM-30 |
Test Method |
| Tensile Strength (MPa) |
80-100 |
70-90 |
60-80 |
ASTM D5035 |
| Compressive Strength (MPa) |
25-30 |
20-25 |
18-22 |
ASTM D695 |
| Wear Loss (mg/100h) |
50-70 |
60-80 |
70-90 |
ASTM D3702 |
| Resilience (%) |
≥25 |
≥23 |
≥20 |
ASTM F1314 |
Environmental Certifications
| Certification Standard |
Test Item |
Test Result |
| RoHS |
Hazardous Substances |
Hazardous Substances |
| REACH |
SVHC Substances |
Compliant |
| FDA |
Food Contact |
21CFR176.170 |
| ISO 14001 |
Environmental Management |
Passed |
Selection Guide
| Operating Condition Feature |
Primary Model Choice |
Alternative Option |
Prohibited Conditions |
| Small Clear Water Pump |
RM-10 |
RM-20 |
Shaft Diameter > 60 mm |
| Medium Circulation Pump |
RM-20 |
RM-30 |
Pressure > 1.5 MPa |
| Large Drainage Pump |
Large Drainage Pump |
- |
Linear Speed > 8 m/s |
| Food Processing Equipment |
RM-10(FDA) |
- |
Oil-based Media |
Notes:
1. All data is based on standard test conditions (water temperature 20±2°C).
2. Actual service life can vary by ±20% depending on water quality.
3. It is recommended to check the moisture status quarterly.
4. Keep moist during long-term storage when not in use.
High-water-base ramie packing rings, with their excellent environmental characteristics and cost-effectiveness, have become the ideal sealing choice for water media equipment such as standard water pumps. They are particularly suitable for users focused on environmental protection and cost control.
