These envelopes are glued with specially formulated neutral conservation adhesive Evacon-RTM on two sides. With thumb notch, without flap.
Material: 100% cotton unbuffered paper
Opening (side): short
Colour: White
Weight: 80 g/m2
Specifications: 100% cotton unbuffered paper
- 100% cotton fibre
- pH 6.7
- Unbuffered
- Non satin surface to allow maximum transpiration
- Glue free
- O.B.A.'s free (optical brightening agents)
- Reducible sulphur, as S, mg/kg, (ppm) less than 1
- Low ash content: 0,06%
- P.A.T. Photographic Activity Test (ANSI ISO 18916)
- Silver Tarnish Test
- Long Life ISO 9706 (Permanence Test)