Contact Form


Please fill all fields marked with *


Non Destructive Testing // Magnetic Particles

DUBL-CHEK Red Underwater No. 1
Underwater Magnetic Oxide Particles
  • Particles are easily agitated, fast acting and produce defined indications
  • Wide range of sensitivity through its broad range of particle sizes High
  • High probability of detection for fine non-visual discontinuities as well as enhancement of larger discontinuities


DUBL-CHEK Underwater No. 1 is red particles pre-mixed with a powdered Wetting Agent for use in underwater inspection. The particles are used with visible light, black light, and blue light. The particles are large for better enhancement of large weld discontinuities. Designed to be used for a variety of underwater inspections, including offshore structural welds, pipeline inspection and ship husbandry.

Physical Properties

Particle Colour: Fluorescent Red / Red
Specific Gravity: 0.9 g/ml
Particle Size: 8.4 µm (average 1.2µm)
Temperature limit: 0°C to 49°C


DUBL-CHEK Underwater No. 1 is to be added at a concentration of 15 grams/litre of water. The preparation may vary due to customer practice and specific application. The storage reservoir should have mechanical or air agitation to help keep the particles in suspension.

It is recommended that adequate particle concentration for the specific application be checked by use of a magnetic field indicator or by observation of the particles applied to a magnetisation device (i.e., electromagnet yoke leg).

When these particles are used in a saltwater environment, a fresh batch solution should be made daily to prevent corrosion of the particles.

Ordering Info

1554/2LBS 1kg
1554/25LBS 5.5kg (1.7 gallons)