Bundesmann Rain Tester

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The Bundesmann Rain Tester simulates natural rainfall to evaluate the water repellency, wetting behavior, and absorption characteristics of textiles, including waterproof fabrics. The instrument features a rainfall unit with 300 uniform drips and a test-driving unit with rotating sample cups and cross-shaped wipers, ensuring precise and repeatable testing conditions.

Application

This tester is widely used for:

Measuring surface wetting, water absorption, and outflow of clothing and textile materials.

Testing waterproof fabrics for outdoor apparel, protective clothing, and technical textiles.

Supporting quality control, R&D, and process optimization in the textile and apparel industries.

Ensuring compliance with international water repellency and hydrostatic resistance standards.

Standards

JIS L 1092 – Test method for water resistance of textiles

GB/T 14577 – Bundesmann rain test method for fabric water repellency determination

ISO 9865 – Textiles: Determination of water repellency of fabrics using the Bundesmann rain test

BS EN 29865 – Textiles: Determination of water repellency of fabrics using the Bundesmann rain test

DIN 53888 – Textiles: Determination of water resistant permeability – Hydrostatic test

Features

(1) Rainfall portion consists of 300 identical drips for uniform precipitation.

(2) Test-driving portion has four sample cups with an outer diameter of 10 cm.

(3) Sample cups are mounted at 15° from vertical for realistic simulation.

(4) Each cup includes a sample installation box and cross-shaped wiper that gently rubs the fabric underside.

(5) Cups rotate around the instrument center, ensuring consistent exposure.

(6) Rainfall intensity is adjustable via a valve (100–300 ml/min per 100 cm²).

(7) Cross-wiper ensures uniform friction and contact pressure for accurate results.

Technical Parameters

Item	Parameter
Rainfall area	~1300 cm²
Drips	300 pieces
Rainfall rate	100–300 ml/min per 100 cm² (adjustable)
Sample size	Ф 140 mm
Test area	~80 cm²
Test sample cup diameter	100 mm
Test cup mounting angle	15°
Test cup rotation speed	~6°/min
Cross-wiper arm length	48 mm
Cross-wiper width	5 mm
Wiper rotation speed	~20 times/min
Wiper friction pressure	~2.5 N
Test duration	Displayed on screen
Device dimensions	~φ80 × 220 cm
Weight	~200 kg
Power supply	AC 220V, 50Hz, 200 W

Accessories

Standard sample cups and cross-shaped wipers

Rainfall drip assembly

Valve for rainfall adjustment

Optional: additional sample holders or calibration kits

Test Procedures

(1) Install the fabric sample in the test cup.

(2) Position the cross-wiper beneath the fabric.

(3) Set rainfall intensity using the valve.

(4) Activate cup rotation and rainfall simulation.

(5) Monitor water absorption, surface wetting, and outflow.

(6) Record results displayed on the screen.

(7) Remove the sample and clean the device after testing.

Maintenance Information

(1) Clean the rainfall unit and drip nozzles to prevent blockage.

(2) Inspect cross-wipers and sample cups regularly for wear.

(3) Check rotation speed and wiper pressure periodically.

(4) Store the instrument in a dry, ventilated environment.

(5) Verify electrical connections and power supply before each test.

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