BS EN ISO 4823:2015 pdf download.Dentistry一Elastomeric impression materials.
c) proportions for hand-spatulated mixes (mass to mass and volume to volume);
d) recommended mixing apparatus and procedures to include the generic identification of any hand coverings (gloves or polymer sheeting) that should be used to avoid contamination of the materials during hand manipulation;
e) mixing time required to obtain a homogeneous mixture of an amount of the material having a volume of 15 ml(see53andAnnix);
f) working time;
g) minimum time the impression should remain in the mouth before removal;
h) minimum or maximum time lapse, or both, permitted between removal of the impression from the mouth and pouring the gypsum product Into the Impression;
i) Identification of at least two gypsum products, complying with requirements of ISO 6873. which the impression material manufacturer has found to be compatible with the impression material being tested: one I’pe 3 product (dental stone, model) and either one 1rpe 4 product or one Tipe S product (dental stone, high strength);
j) when the manufacturer’s instructions state that an impression made of a material may be disinfected, the disinfecting procedure shall he described in detail and a reference indicating that the disinfection procedure will not alter the potential of the impression for optimum performance shall also be identified;
k) when a manufacturer claims that a material in itself is antimicrobial and will remain so without further treatment after the Impression is removed from the mouth, the manufacturer shall identify the reference on which the claim is based.
5.4 Requirements for characteristics and properties
5.4.1 Component colours
Different components intended for use in the same mixture shall be supplied in contrasting colours to provide a means of determining when the components have been thoroughly mixed.
5.4.2 Mixing time (hand-spatulated or hand-kneaded mixes)
When the impression material components are combined according to the manufacturer’s instructions and the results of the mixing are evaluated according to II. the average time required to achieve a homogeneous mixture (essentially streak-free) shall not exceed the time stated by the manufacturer.
d) recommended mixing apparatus and procedures to include the generic identification of any hand coverings (gloves or polymer sheeting) that should be used to avoid contamination of the materials during hand manipulation;
e) mixing time required to obtain a homogeneous mixture of an amount of the material having a volume of 15 ml(see53andAnnix);
f) working time;
g) minimum time the impression should remain in the mouth before removal;
h) minimum or maximum time lapse, or both, permitted between removal of the impression from the mouth and pouring the gypsum product Into the Impression;
i) Identification of at least two gypsum products, complying with requirements of ISO 6873. which the impression material manufacturer has found to be compatible with the impression material being tested: one I’pe 3 product (dental stone, model) and either one 1rpe 4 product or one Tipe S product (dental stone, high strength);
j) when the manufacturer’s instructions state that an impression made of a material may be disinfected, the disinfecting procedure shall he described in detail and a reference indicating that the disinfection procedure will not alter the potential of the impression for optimum performance shall also be identified;
k) when a manufacturer claims that a material in itself is antimicrobial and will remain so without further treatment after the Impression is removed from the mouth, the manufacturer shall identify the reference on which the claim is based.
5.4 Requirements for characteristics and properties
5.4.1 Component colours
Different components intended for use in the same mixture shall be supplied in contrasting colours to provide a means of determining when the components have been thoroughly mixed.
5.4.2 Mixing time (hand-spatulated or hand-kneaded mixes)
When the impression material components are combined according to the manufacturer’s instructions and the results of the mixing are evaluated according to II. the average time required to achieve a homogeneous mixture (essentially streak-free) shall not exceed the time stated by the manufacturer.
