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PROCESSING & TREATMENT SERVICES
Chevron Glass can provide a wide range of processing
and treatment services which includes the following:
ARRISSED EDGE
This edge treatment is produced on an automatic vertical arrisser which leaves a white arrissed edge. This is the minimum edgework for toughened glass.
BEVELLED EDGE
Straight line and shaped bevelling is done on automatic machines which produce a polished bevel on the face of the glass. The bevel width can be varied depending on glass thickness. Bevelled glass has a clean cut edge as standard but flat polished edges are also an option.
BLUNT CORNERS
Blunt or tipped comers can be provided where the only requirement is to remove a sharp corner. The finish will be white and basic.
CLEAN CUT EDGE
Edges are as the glass was cut and are sharp.
CUTOUTS
Cut outs are processed by Waterjet Cutter and supplied with flat smooth (ground) and arrissed edges. Cut outs are defined as having any one dimension greater than 200mm.
FINGER GRIPS
Standard finger grips (slots) are 13mm wide. Length and depth depend on the glass thickness.
FLAT POLISHED EDGE
This is the standard machine polished finish to the edge and arris of the glass.
FLAT SMOOTH (Ground) EDGE
This is a machine flat finish which leaves a smooth, unpolished edge and arris.
HEAT SOAKING
Heat soaking involves heating toughened glass in an oven for a period of time to induce breakage that may be caused by any inclusions or contaminants in the glass. The process substantially reduces the likelihood of breakage after installation due to any inclusions or contaminants. The process is strongly recommended for balustrades, pool surrounds and toughened glass assemblies. In most circumstances, where glass is to be glazed vertically 5.0 metres above ground or floor level, and in the case of sloped overhead glazing 3.0 metres above ground or floor level, it is mandatory for the glass to be heat soaked.
HEAT STRENGTHENING
The heat strengthening process parallels the process of toughening, except that the cooling cycle is less rapid, thereby creating surface compression levels less than that of fully toughened glass. Heat strengthened glass has approximately twice the mechanical and thermal strength of annealed glass of equal thickness. Heat strengthened glass normally has a break pattern of large pieces similar to a break pattern of annealed glass. Heat strengthened glass is used in areas requiring added strength to the glass but a larger break pattern than that of toughened glass, so that in the event of breakage, the broken glass generally remains in the opening. Heat strengthened glass, like toughened glass, cannot be further processed in any way after heat strengthening.
HOLES
Holes can be drilled in all thicknesses of glass. Almost any diameter hole is available.
Holes can be countersunk to accommodate mechanical fixings.
Various standard polished speak holes are available and non standard available on request. (Refer to separate section on Speak Holes).
Fan holes and holes for dog/cat doors are also available.
HOLES IN TOUGHENED GLASS
Holes must be drilled in glass before toughening.
Unusual hole configurations or large hole sizes should be referred for consideration before ordering.
HOLE SIZE
Minimum Dimension: Hole diameters cannot be less than the thickness of the glass.
Maximum Dimension: The maximum dimension of any large circular or non-circular hole should not exceed half of the minimum width of the panel.
EDGE FINISH
Holes will normally have a ground finish • Holes can be countersunk at 45° with ground edges on request. • Countersunk depth should not exceed 75% of glass thickness.
TOLERANCES
POSITION OF HOLES FROM EDGE
For holes less than 50mm diameter the distance between the edge of any hole and the edge of the glass must never be less than 1.5 times the thickness of the glass for glass up to 10mm thickness, and two times the thickness for 12 to 19mm thick panels.
POSITION OF HOLES FROM CORNER
The distance from the edge of hole to the corner of glass must be a minimum four times the glass thickness.
SPACING OF HOLES
The minimum distance between the edges of adjacent holes cannot be less than three times the glass thickness. Where there are more than four holes in a group the minimum distance cannot be less than six times the glass thickness.
HOLES OTHER THAN CIRCULAR
All non-circular holes must have radius corners with the internal radius not less than the thickness of the glass.
SLOTTED HOLES
The diameter of slotted holes must not be less than the thickness of the glass (t). The width of the slot (S) must be at least equal to half of the thickness of the glass (t).
MITRED EDGE
A mitre is a machine edge finish that can be a smooth (ground) finish suitable for angled butt glazing or a polished edge if required. The nominated mitre is the angle of the glass edge remaining.
NOTCHES
The inside of notches must have radius corners at least equal to the thickness of the glass.
EDGE FINISH
Edges will have a flat smooth (ground) finish with arris. Polished notches are available on request. Limitations apply.
DIMENSIONS
The height/width of a notch must be greater than the thickness of the glass. The depth of a notch cannot be greater than half the width of the glass.
TOLERANCES
The tolerance on notch location in relation to the edge of the glass is ±2.0mm.
CORNER NOTCHES
Defined as having maximum dimensions of 200mm x 200mm. Must have an internal radius corner (R) at least equal to the glass thickness. Notches are generally supplied with a flat smooth edge.
SIDE NOTCHES
Defined as having maximum dimensions of 200mm x 200mm. The minimum distance from a corner should be 75mm. External corners on notches must be rounded. Notches are generally supplied with a flat smooth edge.
CENTRE NOTCHES
All centre notches must have radius comers equal to or greater than the glass thickness. The distance between the edge of the centre notch and the glass edge must be at least four times the glass thickness, with a minimum of 25mm for 4-6mm glass and 100mm for 8-19mm glass. The interior width of a centre notch must be equal to or greater than the glass thickness. The distance between centre notches must be at least four times the glass thickness. The notch height and width must be less than 50% of the glass height / width. Centre notches are generally processed by Waterjet Cutter then arrissed.
RADIUS CORNERS
Standard size radius corners are 10,15,20,25,30,35,40,45,50,55,60 and 70mm. A template is not required for standard size radius corners but would be required for corners greater than 70mm. Radius corners can be supplied as clean cut or with polished edges.
SHAPE CUTTING
Squares and rectangles with radius or cut off corners are not regarded as irregular shapes. Glass defined as irregular shapes can fit into three possible categories described below with examples.
STRAIGHT LINE SHAPES
Description: Straight line shapes with a maximum of 4 sides.
Includes: Long corners, out of square parallelograms, raked heads, triangles.
Dimensions must be clearly defined with all necessary measurements.
REGULAR SHAPES
Description: Common shapes with a maximum of 6 straight sides.
Includes: Arch tops, circles, hexagons, quadrants, semi circles.
Dimensions must be clearly defined with a template or CAD drawing supplied.
COMPLEX SHAPES
Description: Irregular shapes with more than 6 sides, non-straight edges or curved shapes.
Includes: Barrels, elbows, concave shapes, "D" ends, heptagons, octagons, ovals, pentagons, Queen Anne tops, abstract shapes and any other shapes not previously covered.
Dimensions must be clearly defined and a CAD drawing or template supplied.
Templates must comply with the Chevron Glass Template Specification Sheet.
SPEAK HOLES – PAY SLOTS – LETTER SLOTS
Standard polished speak holes, pay slots and letter slots are available as shown below. Non standard configurations are available on request.
STANDARD POLISHED SPEAK HOLES, PAY SLOTS AND LETTER SLOTS
TEMPLATE SPECIFICATIONS
Chevron Glass has fully automated cutting lines with facilities for straight line and shaped cutting, which includes laser scanning of various shaped templates. The laser scanning function requires a specific type of template for its operation. The following specifications are intended to reduce any lost time due to an unacceptable template with the main consideration being that the quality of the template will largely affect the outcome of the finished product.
• CAD or similar computerised drawings are acceptable and preferred to actual templates.
• A template handling charge will apply in addition to other charges for all orders to template.
• All templates must be of a sturdy material, such as timber, ply, coreflute, Perspex or metal.
• Templates must be actual FULL SIZE with finished sizes marked on the face if possible.
• Paper, glass or plastic templates will not be accepted.
• All templates must have customer's name and order number clearly marked, attached or followed up with a faxed or
emailed order.
• Templates for products with coated, mirror or patterned glass must clearly show the coated, mirror or smooth face.
• Templates to be returned to the customer must be labelled accordingly.
• Templates for toughened glass must clearly show where the Standards logo is to be located.
• Templates for toughened glass must comply with Chevron Toughened Glass Specifications covering sizes, notches, holes etc.
for Toughened glass.
• Templates with added or subtracted measurements will not be accepted.
• Multi dimensional templates will not be accepted, i.e. one template must refer to one glass panel.
• Broken or damaged templates may not be accepted.
• Standard size radius corners (i.e. 10,15, 20, 25, 30, 35, 40, 45, 50, 55, 60 and 70mm) do not require a template.
• Radius corners drawn on orders and faxed will not be accepted as a template.
• Hole positions on templates must be clearly marked with a cross to identify centre point
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