Lamp Capping Cement - SUPRA - UNV 207 & UNV 208

Technical Memorandum

Description Typical Properties Process Note-I Note-II

Description

SUPRA-UNV 207 is a phenolic novolac resin and is supplied in lump form.

SUPRA-UNV 208 is also a phenolic novolac resin but supplied as pre-mixed with hexamine in fine powder form.

Typical Properties

Process

Typical lamp capping cement formulation:

SUPRA-UNV 207 12.5 parts Hexamine content 1.25 parts Gum or wood resin 2.5-4 parts Shellac 2.5-4 parts Malachite green solution in Industrial methylated spirit 8 parts

Note-I

Instead of 12.5 parts of UNV 207 & 1.25 parts of hexamine, 13.75 parts of UNV 208 may be used.

Note-II

The malachite green solution is a solution of 1 gm of malachite green in 1000 gms of industrial methylated spirit.

The above ingredients are mixed till all the materials are in solution. The solution is then added to 100 pars by weight of hiller in a mixer until smooth paste is obtained.

Fillers suitable for use in these formulations are marble dust or calcite ground to nominal 150 mesh with no retention on 30 mesh.

The amount of industrial methylated spirit can be varied in both the formulations from batch to batch give a paste with correct flow properties for the cap filling machines.

If the bonding properties and resilience of cement formulations without shellac is satisfactory, shellac can be eliminated from the formulations.

Note: Whilst the above information is based on the result of experimental work in our laboratories and is correct to the best of our knowledge, users are recommended to establish for themselves that the process and materials are satisfactory of their requirements. Freedom from patent rights must not be assumed. No liability is accepted by us for any damage, injury or loss resulting from the use of this information.