ISO 15854:2021 pdf free download.Dentistry一Casting and baseplate waxes.
5.6 Behaviour on softening (Type 2)
The wax shall soften without becoming sticky or crumbly and shall be mouldable without breaking or delaminating when tested in accordance with 4.
This requirement shall not apply to baseplate preforms where a suitable square test piece cannot be cut.
5.7 Residue on artificial teeth (Type 2)
The wax shall not leave a visible residue on either ceramic or synthetic polymer teeth when tested in accordance with j.
5.8 Behaviour of colouring material (Type 2)
The colouring material shall neither separate from the wax nor impregnate the gypsum mould when tested in accordance with BJ.
5.9 Adhesion on storage (Type 2)
Adhesion due to storage of the wax shall be such that, when tested in accordance with 8.8. there shall be no evidence of damage to wax surfaces. Wax and separating paper surfaces shall separate cleanly and readily.
NOTE The separating paper might not cover the whole area of the wax sheet.
5.10 Residue on ignition (Type 1)
If the manufacturer does not state a value for the residue on ignition, the value as determined in accordance with 9 shall be no greater than 010 % by mass.
If the residue on ignition is greater than 0,10 % by mass, this value shall be stated by the manufacturer and the value as determined in accordance with 9 shall be not more than 20 % greater than that stated value.
5.11 Biocompatibility
See ISO 7405 and ISO 10993-1 for guidance on compatibility in respect of waxes that are offered for use in the mouth or that are not specifically excluded from that application.
6 Sampling
The amount of material procured for testing shall be at least 250 g for pe 1, or 500 g for Type 2, and from one batch, and one packet where possible. This material shall be obtained on the open market unannounced and thus taken randomly from stock.
7 Test methods — General
7.1 Ambient temperature
Unless otherwise specified in this document, all test piece preparation and testing shall be conducted at an ambient temperature of (23 ± 2) °C. Where necessary and appropriate, all material shall be allowed to equilibrate at this ambient temperature before testing for at least 24 h.ISO 15854 pdf download.