Application guide Kompar-P

1. Purpose and Range of Application

1.1. Composite replication material "Kompar-P" (St. № 2243-01500482134-2001) is used to get high-precision solid replicas of the surfaces of glass, metal and other articles compatible with it for the following instrumental control and visual inspection of the roughness with the help of a copy (including a copy of a thread) instead of an article.

1.2. "Kompar" permits to get a copy of a surface with roughness parameters (Ra) from 0,04 up to 2,5 m with an error not more than 20%.

1.3. A copy can be kept 3-4 years permitting to use it for repeated measurements and as an arbitration sample.

1.4. "Kompar" is used for nondestructive check of surface roughness in fine metal-working, machine-building industry, aircraft building, production accessories building. It can be also used in machine and mechanism repairing. "Kompar" permits to get copies at different angles and can be used for getting copies of the surfaces difficult to access.

2. Properties

2.1. "Kompar" is a composite material of chemical hardening. It is made of the mixture of low-volative diacrylates with inorganic filling material. The set consists of two pastes (catalyst - accelerate paste A, basic - peroxide paste B) of different colours. The pastes are polymerized (hardened) after their mixing up in the ratio of one to one. The hardness after polymerization is not less than 200 MPa.

2.2. "Kompar" does not irritate the skin, it is not toxic. It burns at open flame.

2.3. Polymerization runs with heat evolution. Depending on the conditions the temperature of the material (mixture) is (40-60)oC. In case of large volumes the temperature can reach 90oС.

2.4. In the case of the ingress of pastes or mixture on the skin one should wash the skin with water and soap and dry it with the help of a towel or rags.

3. Directions for use

3.1. Preparation of a surface:
The surface should be cleaned from mud and dust and should be degreased with the help of non-ethylated benzine, white spirit, ethyl alcohol or their mixtures. Copies should be taken from dry surfaces.

If the surface has irregular form (holes, thread etc.) or is covered with lacquer coating one may use linseed oil to take the imprint of the surface off. Linseed oil should be put on clean, dry surface. After that one should to wipe the surface with a peace of clean, pileless fabric and now one may put "Kompar" on the surface.

The surface should have the temperature from +10o up to +40oC. To work at low temperatures one should acquire in addition activating (hardening) agent. The consumption of the activating agent - one drop for 3 g of the mixture of the pastes.

3.2. Preparation of the material.
Open jars with pastes, take three spatulas, modelling mass, glass plate and backing.

One has to mark the surface from which an imprint will be taken with modelling mass. Put equal quantity of each paste (without mixing) on the backing with the help of spatulas. Mix the pastes with the third spatula to get a homogeneous mass. One has to avoid the air ingress in the mass. The mixing up of the pastes takes about a minute.

ATTENTION! One should take each paste and mix them up with individual spatulas to avoid self-polymerization. After the work spatulas should be thoroughly cleaned from the material!

3.3. Getting a copy
Put the material on the surface marked by the modelling mass. To cover tightly the surface with glass plate. In 20 minutes take the plate off and take the imprint out.

3.4. Surface roughness measurement
According to the guideline to a profile meter one should get Ra of the surface of the imprint from the surface of the article. Repeat the measurement 10 times changing the starting point. Calculate arithmetic average Raott, microns, for each imprint. This arithmetic average is recognized as Ra of the surface of the article:

, where - the surface of the imprint at each i measurement, microns. N - is a number of measurements

4. Storage

"Kompar" in the package of manufacturer is kept not less than 1,5 years at the temperature up to 15oC.

Open set of the material should be kept at the temperature not more than 15oC in dry premise, proof from direct sun-rays and fire.

The imprints (copies) can be kept in normal conditions not less than 3 years in the premises, proof from direct sun-rays.